Java全栈项目-校园智能垃圾分类系统

项目介绍

随着环保意识的提升，垃圾分类已成为现代校园管理的重要议题。本项目旨在通过Java全栈技术，构建一个智能化的校园垃圾分类管理系统，助力校园环保事业发展。

技术栈

后端技术

• Spring Boot 2.7.0：快速构建基于Spring的应用程序
• Spring Security：实现身份认证和权限控制
• MyBatis Plus：简化数据库操作
• MySQL 8.0：数据持久化存储
• Redis：缓存处理和会话管理
• JWT：实现无状态的用户认证

前端技术

• Vue 3：构建用户界面
• Element Plus：UI组件库
• Axios：处理HTTP请求
• Echarts：数据可视化展示
• Vite：前端构建工具

核心功能模块

1. 用户管理模块

• 学生、教师、管理员多角色管理
• 基于JWT的登录认证
• 细粒度的权限控制
• 个人信息管理

2. 垃圾分类指导模块

• 垃圾分类知识库
• 智能识别算法支持
• 分类指导交互
• 常见问题解答

3. 垃圾投放管理模块

• 智能垃圾箱实时监控
• 垃圾箱容量预警
• 投放记录追踪
• 分类准确度统计

4. 积分奖励模块

• 正确投放积分奖励
• 积分兑换商城
• 排行榜系统
• 成就体系

5. 数据分析模块

• 垃圾分类数据统计
• 投放行为分析
• 效果评估报告
• 趋势预测

系统架构

整体架构

采用前后端分离的微服务架构，主要分为以下几层：

1. 表现层：处理用户交互和数据展示
2. 业务层：实现核心业务逻辑
3. 持久层：负责数据存储和访问
4. 基础设施层：提供技术支持和服务

数据库设计

基于业务需求，设计了如下核心表结构：

• 用户表（user）
• 垃圾分类表（waste_category）
• 投放记录表（disposal_record）
• 积分记录表（point_record）
• 知识库表（knowledge_base）

项目亮点

1. 智能识别：集成深度学习算法，实现垃圾图像的自动分类识别

2. 实时监控：通过IoT技术实现垃圾箱状态的实时监控和预警

3. 数据可视化：运用Echarts实现直观的数据展示和分析

4. 游戏化设计：引入积分、排行榜等游戏化元素，提高用户参与度

5. 微服务架构：采用微服务设计，提高系统可扩展性和维护性

项目收获

通过本项目的开发，不仅提升了全栈开发能力，也深入理解了以下几点：

1. 前后端分离架构的设计与实现
2. 微服务的划分与治理
3. 分布式系统的技术难点
4. 大数据分析与可视化
5. 项目开发完整流程

未来展望

1. 引入更多AI技术，提升识别准确率
2. 扩展到更多场景，如社区、企业等
3. 优化系统性能，提升用户体验
4. 增加更多互动功能，提高参与度
5. 完善数据分析，为决策提供支持

本项目不仅是一个技术实践，更是对环保理念的实际应用。通过技术手段促进垃圾分类习惯的养成，为建设绿色校园贡献力量。

源代码

Directory Content Summary

Directory Structure

src/
  backend/
    pom.xml
    src/
      main/
        java/
          com/
            campus/
              waste/
                WasteApplication.java
                common/
                  R.java
                config/
                  SecurityConfig.java
                controller/
                  AchievementController.java
                  AuthController.java
                  DataAnalysisController.java
                  DisposalManagementController.java
                  KnowledgeController.java
                  PointsController.java
                  UserController.java
                  WasteClassificationController.java
                entity/
                  Achievement.java
                  BinAlert.java
                  ClassificationStats.java
                  DisposalBehavior.java
                  DisposalRecord.java
                  EffectivenessReport.java
                  FAQ.java
                  KnowledgeArticle.java
                  PointsExchange.java
                  PointsProduct.java
                  PointsRecord.java
                  SmartBin.java
                  TrendPrediction.java
                  User.java
                  UserAchievement.java
                  UserPoints.java
                  WasteCategory.java
                  WasteItem.java
                  WasteStatistics.java
                model/
                  dto/
                    ImageRecognitionDTO.java
                    LoginDTO.java
                    UserDTO.java
                  vo/
                    BinAlertVO.java
                    BinMonitoringVO.java
                    BinVolumeStatVO.java
                    ClassificationStatsVO.java
                    DisposalRecordVO.java
                    FAQVO.java
                    KnowledgeArticleVO.java
                    LoginVO.java
                    SmartBinDetailVO.java
                    SmartBinVO.java
                    UserVO.java
                    WasteCategoryVO.java
                    WasteItemVO.java
                security/
                  JwtAuthenticationFilter.java
                  JwtTokenProvider.java
                service/
                  AchievementService.java
                  DataAnalysisService.java
                  DisposalManagementService.java
                  KnowledgeService.java
                  PointsService.java
                  UserService.java
                  WasteClassificationService.java
                  impl/
                    AchievementServiceImpl.java
                    DataAnalysisServiceImpl.java
                    DisposalManagementServiceImpl.java
                    KnowledgeServiceImpl.java
                    PointsServiceImpl.java
                    UserServiceImpl.java
                    WasteClassificationServiceImpl.java
        resources/
          application.yml
          db/
            data_analysis.sql
            points_reward.sql
            schema.sql
            waste_classification.sql
            waste_disposal.sql
    target/
      classes/
        application.yml
        com/
          campus/
            waste/
              common/
              config/
              controller/
              entity/
              model/
                dto/
                vo/
              security/
              service/
                impl/
        db/
          data_analysis.sql
          points_reward.sql
          schema.sql
          waste_classification.sql
          waste_disposal.sql
      generated-sources/
        annotations/
      generated-test-sources/
        test-annotations/
      test-classes/
  frontend/
    src/
      api/
        achievement.js
        analysis.js
        disposal.js
        points.js
      views/
        analysis/
          Dashboard.vue
        disposal/
          BinMonitoring.vue
          ClassificationStats.vue
          DisposalRecords.vue
        points/
          Achievement.vue
          PointsMall.vue
        waste/
          WasteClassification.vue

File Contents

backend\pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.campus</groupId>
    <artifactId>waste-classification</artifactId>
    <version>1.0.0</version>
    <name>campus-waste-classification</name>
    <description>Campus Waste Classification System</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.7.0</version>
    </parent>

    <properties>
        <java.version>1.8</java.version>
        <mybatis-plus.version>3.5.2</mybatis-plus.version>
        <jjwt.version>0.9.1</jjwt.version>
        <druid.version>1.2.8</druid.version>
        <hutool.version>5.8.0</hutool.version>
    </properties>

    <dependencies>
        <!-- Spring Boot -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-validation</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>

        <!-- MyBatis Plus -->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>${mybatis-plus.version}</version>
        </dependency>

        <!-- MySQL -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>

        <!-- Druid -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>${druid.version}</version>
        </dependency>

        <!-- JWT -->
        <dependency>
            <groupId>io.jsonwebtoken</groupId>
            <artifactId>jjwt</artifactId>
            <version>${jjwt.version}</version>
        </dependency>

        <!-- Hutool工具包 -->
        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>${hutool.version}</version>
        </dependency>

        <!-- Lombok -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>

        <!-- Test -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

backend\src\main\java\com\campus\waste\WasteApplication.java

package com.campus.waste;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.transaction.annotation.EnableTransactionManagement;

@SpringBootApplication
@EnableTransactionManagement
public class WasteApplication {
    public static void main(String[] args) {
        SpringApplication.run(WasteApplication.class, args);
    }
}

backend\src\main\java\com\campus\waste\common\R.java

package com.campus.waste.common;

import lombok.Data;

@Data
public class R<T> {
    private Integer code;
    private String message;
    private T data;

    private R(Integer code, String message, T data) {
        this.code = code;
        this.message = message;
        this.data = data;
    }

    public static <T> R<T> ok() {
        return new R<>(200, "success", null);
    }

    public static <T> R<T> ok(T data) {
        return new R<>(200, "success", data);
    }

    public static <T> R<T> error(String message) {
        return new R<>(500, message, null);
    }

    public static <T> R<T> error(Integer code, String message) {
        return new R<>(code, message, null);
    }
}

backend\src\main\java\com\campus\waste\config\SecurityConfig.java

package com.campus.waste.config;

import com.campus.waste.security.JwtAuthenticationFilter;
import com.campus.waste.security.JwtAuthenticationEntryPoint;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.config.annotation.authentication.configuration.AuthenticationConfiguration;
import org.springframework.security.config.annotation.method.configuration.EnableGlobalMethodSecurity;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.http.SessionCreationPolicy;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.security.web.SecurityFilterChain;
import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;

@Configuration
@EnableWebSecurity
@EnableGlobalMethodSecurity(prePostEnabled = true)
public class SecurityConfig {

    private final JwtAuthenticationEntryPoint jwtAuthenticationEntryPoint;
    private final JwtAuthenticationFilter jwtAuthenticationFilter;

    public SecurityConfig(JwtAuthenticationEntryPoint jwtAuthenticationEntryPoint,
                        JwtAuthenticationFilter jwtAuthenticationFilter) {
        this.jwtAuthenticationEntryPoint = jwtAuthenticationEntryPoint;
        this.jwtAuthenticationFilter = jwtAuthenticationFilter;
    }

    @Bean
    public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
        http.csrf().disable()
            .exceptionHandling().authenticationEntryPoint(jwtAuthenticationEntryPoint)
            .and()
            .sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS)
            .and()
            .authorizeRequests()
            .antMatchers("/auth/**").permitAll()
            .antMatchers("/swagger-ui/**", "/v3/api-docs/**").permitAll()
            .anyRequest().authenticated();

        http.addFilterBefore(jwtAuthenticationFilter, UsernamePasswordAuthenticationFilter.class);
        return http.build();
    }

    @Bean
    public AuthenticationManager authenticationManager(AuthenticationConfiguration authConfig) throws Exception {
        return authConfig.getAuthenticationManager();
    }

    @Bean
    public PasswordEncoder passwordEncoder() {
        return new BCryptPasswordEncoder();
    }
}

backend\src\main\java\com\campus\waste\controller\AchievementController.java

package com.campus.waste.controller;

import com.campus.waste.common.R;
import com.campus.waste.model.vo.*;
import com.campus.waste.service.AchievementService;
import org.springframework.web.bind.annotation.*;

import java.util.List;

@RestController
@RequestMapping("/achievement")
public class AchievementController {

    private final AchievementService achievementService;

    public AchievementController(AchievementService achievementService) {
        this.achievementService = achievementService;
    }

    @GetMapping("/list")
    public R<List<AchievementVO>> getAllAchievements() {
        return R.ok(achievementService.getAllAchievements());
    }

    @GetMapping("/user")
    public R<List<UserAchievementVO>> getUserAchievements() {
        Long userId = getCurrentUserId();
        return R.ok(achievementService.getUserAchievements(userId));
    }

    @GetMapping("/recent")
    public R<List<UserAchievementVO>> getRecentCompletedAchievements(
            @RequestParam(defaultValue = "5") Integer limit) {
        Long userId = getCurrentUserId();
        return R.ok(achievementService.getRecentCompletedAchievements(userId, limit));
    }

    @GetMapping("/stats")
    public R<AchievementStatsVO> getUserAchievementStats() {
        Long userId = getCurrentUserId();
        return R.ok(achievementService.getUserAchievementStats(userId));
    }

    // TODO: 从SecurityContext中获取当前用户ID
    private Long getCurrentUserId() {
        return 1L; // 临时返回测试用户ID
    }
}

backend\src\main\java\com\campus\waste\controller\AuthController.java

package com.campus.waste.controller;

import com.campus.waste.common.R;
import com.campus.waste.model.dto.LoginDTO;
import com.campus.waste.model.vo.LoginVO;
import com.campus.waste.security.JwtTokenProvider;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.validation.Valid;

@RestController
@RequestMapping("/auth")
public class AuthController {

    private final AuthenticationManager authenticationManager;
    private final JwtTokenProvider tokenProvider;

    public AuthController(AuthenticationManager authenticationManager, JwtTokenProvider tokenProvider) {
        this.authenticationManager = authenticationManager;
        this.tokenProvider = tokenProvider;
    }

    @PostMapping("/login")
    public R<LoginVO> login(@Valid @RequestBody LoginDTO loginDTO) {
        Authentication authentication = authenticationManager.authenticate(
            new UsernamePasswordAuthenticationToken(
                loginDTO.getUsername(),
                loginDTO.getPassword()
            )
        );

        SecurityContextHolder.getContext().setAuthentication(authentication);

        String jwt = tokenProvider.generateToken(authentication);
        
        LoginVO loginVO = new LoginVO();
        loginVO.setToken(jwt);
        loginVO.setTokenType("Bearer");
        
        return R.ok(loginVO);
    }
}

backend\src\main\java\com\campus\waste\controller\DataAnalysisController.java

package com.campus.waste.controller;

import com.campus.waste.common.R;
import com.campus.waste.model.vo.*;
import com.campus.waste.service.DataAnalysisService;
import org.springframework.format.annotation.DateTimeFormat;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.security.access.prepost.PreAuthorize;
import org.springframework.web.bind.annotation.*;

import java.time.LocalDate;
import java.util.List;
import java.util.Map;

@RestController
@RequestMapping("/analysis")
@PreAuthorize("hasRole('ADMIN')")
public class DataAnalysisController {

    private final DataAnalysisService dataAnalysisService;

    public DataAnalysisController(DataAnalysisService dataAnalysisService) {
        this.dataAnalysisService = dataAnalysisService;
    }

    @GetMapping("/statistics")
    public R<List<WasteStatisticsVO>> getWasteStatistics(
            @RequestParam @DateTimeFormat(pattern = "yyyy-MM-dd") LocalDate startDate,
            @RequestParam @DateTimeFormat(pattern = "yyyy-MM-dd") LocalDate endDate,
            @RequestParam(required = false) String wasteType) {
        return R.ok(dataAnalysisService.getWasteStatistics(startDate, endDate, wasteType));
    }

    @GetMapping("/behavior")
    public R<DisposalBehaviorAnalysisVO> getDisposalBehaviorAnalysis(
            @RequestParam @DateTimeFormat(pattern = "yyyy-MM-dd") LocalDate startDate,
            @RequestParam @DateTimeFormat(pattern = "yyyy-MM-dd") LocalDate endDate) {
        return R.ok(dataAnalysisService.getDisposalBehaviorAnalysis(startDate, endDate));
    }

    @GetMapping("/behavior/user/{userId}")
    public R<List<DisposalBehaviorVO>> getUserDisposalBehaviors(
            @PathVariable Long userId,
            @RequestParam @DateTimeFormat(pattern = "yyyy-MM-dd") LocalDate startDate,
            @RequestParam @DateTimeFormat(pattern = "yyyy-MM-dd") LocalDate endDate) {
        return R.ok(dataAnalysisService.getUserDisposalBehaviors(userId, startDate, endDate));
    }

    @GetMapping("/report")
    public R<EffectivenessReportVO> getEffectivenessReport(
            @RequestParam @DateTimeFormat(pattern = "yyyy-MM-dd") LocalDate reportDate) {
        return R.ok(dataAnalysisService.getEffectivenessReport(reportDate));
    }

    @PostMapping("/report/generate")
    public R<Void> generateEffectivenessReport(
            @RequestParam @DateTimeFormat(pattern = "yyyy-MM-dd") LocalDate reportDate) {
        dataAnalysisService.generateEffectivenessReport(reportDate);
        return R.ok();
    }

    @GetMapping("/prediction")
    public R<List<TrendPredictionVO>> getTrendPrediction(
            @RequestParam String wasteType,
            @RequestParam(defaultValue = "3") Integer predictionMonths) {
        return R.ok(dataAnalysisService.getTrendPrediction(wasteType, predictionMonths));
    }

    @PostMapping("/prediction/update")
    public R<Void> updateTrendPrediction(@RequestParam String wasteType) {
        dataAnalysisService.updateTrendPrediction(wasteType);
        return R.ok();
    }

    @GetMapping("/overview")
    public R<Map<String, Object>> getDataAnalysisOverview() {
        return R.ok(dataAnalysisService.getDataAnalysisOverview());
    }

    @GetMapping("/time")
    public R<List<TimeAnalysisVO>> getTimeAnalysis(
            @RequestParam @DateTimeFormat(pattern = "yyyy-MM-dd") LocalDate startDate,
            @RequestParam @DateTimeFormat(pattern = "yyyy-MM-dd") LocalDate endDate) {
        return R.ok(dataAnalysisService.getTimeAnalysis(startDate, endDate));
    }

    @GetMapping("/region")
    public R<List<RegionAnalysisVO>> getRegionAnalysis(
            @RequestParam @DateTimeFormat(pattern = "yyyy-MM-dd") LocalDate startDate,
            @RequestParam @DateTimeFormat(pattern = "yyyy-MM-dd") LocalDate endDate) {
        return R.ok(dataAnalysisService.getRegionAnalysis(startDate, endDate));
    }

    @GetMapping("/export")
    public ResponseEntity<byte[]> exportAnalysisReport(
            @RequestParam @DateTimeFormat(pattern = "yyyy-MM-dd") LocalDate startDate,
            @RequestParam @DateTimeFormat(pattern = "yyyy-MM-dd") LocalDate endDate) {
        byte[] report = dataAnalysisService.exportAnalysisReport(startDate, endDate);
        
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
        headers.setContentDispositionFormData("attachment", 
            String.format("analysis_report_%s_%s.xlsx", startDate, endDate));
        
        return ResponseEntity.ok()
                .headers(headers)
                .body(report);
    }
}

backend\src\main\java\com\campus\waste\controller\DisposalManagementController.java

package com.campus.waste.controller;

import com.campus.waste.common.R;
import com.campus.waste.entity.DisposalRecord;
import com.campus.waste.model.vo.*;
import com.campus.waste.service.DisposalManagementService;
import com.baomidou.mybatisplus.core.metadata.IPage;
import org.springframework.security.access.prepost.PreAuthorize;
import org.springframework.web.bind.annotation.*;

import java.util.List;

@RestController
@RequestMapping("/disposal")
public class DisposalManagementController {

    private final DisposalManagementService disposalManagementService;

    public DisposalManagementController(DisposalManagementService disposalManagementService) {
        this.disposalManagementService = disposalManagementService;
    }

    @GetMapping("/bins")
    public R<List<SmartBinVO>> getAllBins() {
        return R.ok(disposalManagementService.getAllBins());
    }

    @GetMapping("/bin/{binId}")
    public R<SmartBinDetailVO> getBinDetail(@PathVariable Long binId) {
        return R.ok(disposalManagementService.getBinDetail(binId));
    }

    @PutMapping("/bin/{binId}/status/{status}")
    @PreAuthorize("hasRole('ADMIN')")
    public R<Void> updateBinStatus(@PathVariable Long binId, @PathVariable Integer status) {
        disposalManagementService.updateBinStatus(binId, status);
        return R.ok();
    }

    @PostMapping("/record")
    public R<Void> recordDisposal(@RequestBody DisposalRecord record) {
        disposalManagementService.recordDisposal(record);
        return R.ok();
    }

    @GetMapping("/records")
    public R<IPage<DisposalRecordVO>> getDisposalRecords(
            @RequestParam(required = false) Long binId,
            @RequestParam(required = false) Long userId,
            @RequestParam(defaultValue = "1") Integer pageNum,
            @RequestParam(defaultValue = "10") Integer pageSize) {
        return R.ok(disposalManagementService.getDisposalRecords(binId, userId, pageNum, pageSize));
    }

    @GetMapping("/alerts")
    @PreAuthorize("hasAnyRole('ADMIN', 'TEACHER')")
    public R<List<BinAlertVO>> getUnprocessedAlerts() {
        return R.ok(disposalManagementService.getUnprocessedAlerts());
    }

    @PostMapping("/alert/{alertId}/process")
    @PreAuthorize("hasAnyRole('ADMIN', 'TEACHER')")
    public R<Void> processAlert(
            @PathVariable Long alertId,
            @RequestParam String processor,
            @RequestParam String processResult) {
        disposalManagementService.processAlert(alertId, processor, processResult);
        return R.ok();
    }

    @GetMapping("/stats")
    public R<List<ClassificationStatsVO>> getClassificationStats(
            @RequestParam(required = false) Long userId,
            @RequestParam(defaultValue = "week") String timeRange) {
        return R.ok(disposalManagementService.getClassificationStats(userId, timeRange));
    }

    @GetMapping("/monitoring")
    @PreAuthorize("hasAnyRole('ADMIN', 'TEACHER')")
    public R<List<BinMonitoringVO>> getBinMonitoringData() {
        return R.ok(disposalManagementService.getBinMonitoringData());
    }

    @PostMapping("/bin/{binId}/clean")
    @PreAuthorize("hasAnyRole('ADMIN', 'TEACHER')")
    public R<Void> cleanBin(@PathVariable Long binId) {
        disposalManagementService.cleanBin(binId);
        return R.ok();
    }

    @GetMapping("/bin/{binId}/volume-trend")
    public R<List<BinVolumeStatVO>> getBinVolumeTrend(
            @PathVariable Long binId,
            @RequestParam(defaultValue = "day") String timeRange) {
        return R.ok(disposalManagementService.getBinVolumeTrend(binId, timeRange));
    }
}

backend\src\main\java\com\campus\waste\controller\KnowledgeController.java

package com.campus.waste.controller;

import com.campus.waste.common.R;
import com.campus.waste.entity.KnowledgeArticle;
import com.campus.waste.entity.FAQ;
import com.campus.waste.model.vo.KnowledgeArticleVO;
import com.campus.waste.model.vo.FAQVO;
import com.campus.waste.service.KnowledgeService;
import com.baomidou.mybatisplus.core.metadata.IPage;
import org.springframework.security.access.prepost.PreAuthorize;
import org.springframework.web.bind.annotation.*;

import java.util.List;

@RestController
@RequestMapping("/knowledge")
public class KnowledgeController {

    private final KnowledgeService knowledgeService;

    public KnowledgeController(KnowledgeService knowledgeService) {
        this.knowledgeService = knowledgeService;
    }

    @GetMapping("/articles")
    public R<IPage<KnowledgeArticleVO>> getArticleList(
            @RequestParam(required = false) Long categoryId,
            @RequestParam(defaultValue = "1") Integer pageNum,
            @RequestParam(defaultValue = "10") Integer pageSize) {
        return R.ok(knowledgeService.getArticleList(categoryId, pageNum, pageSize));
    }

    @GetMapping("/article/{articleId}")
    public R<KnowledgeArticleVO> getArticleDetail(@PathVariable Long articleId) {
        // 增加浏览次数
        knowledgeService.incrementArticleViewCount(articleId);
        return R.ok(knowledgeService.getArticleDetail(articleId));
    }

    @PostMapping("/article")
    @PreAuthorize("hasAnyRole('ADMIN', 'TEACHER')")
    public R<Void> addArticle(@RequestBody KnowledgeArticle article) {
        knowledgeService.addArticle(article);
        return R.ok();
    }

    @PutMapping("/article")
    @PreAuthorize("hasAnyRole('ADMIN', 'TEACHER')")
    public R<Void> updateArticle(@RequestBody KnowledgeArticle article) {
        knowledgeService.updateArticle(article);
        return R.ok();
    }

    @DeleteMapping("/article/{articleId}")
    @PreAuthorize("hasAnyRole('ADMIN', 'TEACHER')")
    public R<Void> deleteArticle(@PathVariable Long articleId) {
        knowledgeService.deleteArticle(articleId);
        return R.ok();
    }

    @GetMapping("/faqs")
    public R<List<FAQVO>> getFAQList(@RequestParam(required = false) Long categoryId) {
        return R.ok(knowledgeService.getFAQList(categoryId));
    }

    @PostMapping("/faq")
    @PreAuthorize("hasAnyRole('ADMIN', 'TEACHER')")
    public R<Void> addFAQ(@RequestBody FAQ faq) {
        knowledgeService.addFAQ(faq);
        return R.ok();
    }

    @PutMapping("/faq")
    @PreAuthorize("hasAnyRole('ADMIN', 'TEACHER')")
    public R<Void> updateFAQ(@RequestBody FAQ faq) {
        knowledgeService.updateFAQ(faq);
        return R.ok();
    }

    @DeleteMapping("/faq/{faqId}")
    @PreAuthorize("hasAnyRole('ADMIN', 'TEACHER')")
    public R<Void> deleteFAQ(@PathVariable Long faqId) {
        knowledgeService.deleteFAQ(faqId);
        return R.ok();
    }

    @PostMapping("/faq/{faqId}/view")
    public R<Void> incrementFAQViewCount(@PathVariable Long faqId) {
        knowledgeService.incrementFAQViewCount(faqId);
        return R.ok();
    }
}

backend\src\main\java\com\campus\waste\controller\PointsController.java

package com.campus.waste.controller;

import com.campus.waste.common.R;
import com.campus.waste.model.vo.*;
import com.campus.waste.service.PointsService;
import com.baomidou.mybatisplus.core.metadata.IPage;
import org.springframework.security.access.prepost.PreAuthorize;
import org.springframework.web.bind.annotation.*;

import java.util.List;

@RestController
@RequestMapping("/points")
public class PointsController {

    private final PointsService pointsService;

    public PointsController(PointsService pointsService) {
        this.pointsService = pointsService;
    }

    @GetMapping("/info")
    public R<UserPointsVO> getUserPoints() {
        Long userId = getCurrentUserId();
        return R.ok(pointsService.getUserPoints(userId));
    }

    @GetMapping("/records")
    public R<IPage<PointsRecordVO>> getPointsRecords(
            @RequestParam(required = false) Integer type,
            @RequestParam(defaultValue = "1") Integer pageNum,
            @RequestParam(defaultValue = "10") Integer pageSize) {
        Long userId = getCurrentUserId();
        return R.ok(pointsService.getPointsRecords(userId, type, pageNum, pageSize));
    }

    @GetMapping("/products")
    public R<List<PointsProductVO>> getProductList(
            @RequestParam(defaultValue = "false") Boolean includeOffShelf) {
        return R.ok(pointsService.getProductList(includeOffShelf));
    }

    @PostMapping("/exchange")
    public R<Void> exchangeProduct(@RequestBody PointsExchangeDTO dto) {
        Long userId = getCurrentUserId();
        pointsService.exchangeProduct(
            userId,
            dto.getProductId(),
            dto.getQuantity(),
            dto.getReceiverName(),
            dto.getReceiverPhone(),
            dto.getReceiverAddress()
        );
        return R.ok();
    }

    @GetMapping("/exchanges")
    public R<IPage<PointsExchangeVO>> getExchangeRecords(
            @RequestParam(required = false) Integer status,
            @RequestParam(defaultValue = "1") Integer pageNum,
            @RequestParam(defaultValue = "10") Integer pageSize) {
        Long userId = getCurrentUserId();
        return R.ok(pointsService.getExchangeRecords(userId, status, pageNum, pageSize));
    }

    @GetMapping("/ranking")
    public R<List<PointsRankingVO>> getPointsRanking(
            @RequestParam(defaultValue = "week") String timeRange) {
        return R.ok(pointsService.getPointsRanking(timeRange));
    }

    @PutMapping("/exchange/{exchangeId}/status/{status}")
    @PreAuthorize("hasRole('ADMIN')")
    public R<Void> updateExchangeStatus(
            @PathVariable Long exchangeId,
            @PathVariable Integer status) {
        pointsService.updateExchangeStatus(exchangeId, status);
        return R.ok();
    }

    // TODO: 从SecurityContext中获取当前用户ID
    private Long getCurrentUserId() {
        return 1L; // 临时返回测试用户ID
    }
}

backend\src\main\java\com\campus\waste\controller\UserController.java

package com.campus.waste.controller;

import com.campus.waste.common.R;
import com.campus.waste.model.dto.UserDTO;
import com.campus.waste.model.vo.UserVO;
import com.campus.waste.service.UserService;
import org.springframework.security.access.prepost.PreAuthorize;
import org.springframework.web.bind.annotation.*;

import javax.validation.Valid;
import java.util.List;

@RestController
@RequestMapping("/user")
public class UserController {

    private final UserService userService;

    public UserController(UserService userService) {
        this.userService = userService;
    }

    @PostMapping("/register")
    public R<Void> register(@Valid @RequestBody UserDTO userDTO) {
        userService.register(userDTO);
        return R.ok();
    }

    @PutMapping
    @PreAuthorize("hasAnyRole('ADMIN', 'TEACHER', 'STUDENT')")
    public R<Void> updateUserInfo(@Valid @RequestBody UserDTO userDTO) {
        userService.updateUserInfo(userDTO);
        return R.ok();
    }

    @GetMapping("/{userId}")
    @PreAuthorize("hasAnyRole('ADMIN', 'TEACHER', 'STUDENT')")
    public R<UserVO> getUserInfo(@PathVariable Long userId) {
        return R.ok(userService.getUserInfo(userId));
    }

    @GetMapping("/list")
    @PreAuthorize("hasRole('ADMIN')")
    public R<List<UserVO>> getUserList(@RequestParam(required = false) Integer userType) {
        return R.ok(userService.getUserList(userType));
    }

    @PutMapping("/{userId}/status/{status}")
    @PreAuthorize("hasRole('ADMIN')")
    public R<Void> updateUserStatus(@PathVariable Long userId, @PathVariable Integer status) {
        userService.updateUserStatus(userId, status);
        return R.ok();
    }

    @DeleteMapping("/{userId}")
    @PreAuthorize("hasRole('ADMIN')")
    public R<Void> deleteUser(@PathVariable Long userId) {
        userService.deleteUser(userId);
        return R.ok();
    }
}

backend\src\main\java\com\campus\waste\controller\WasteClassificationController.java

package com.campus.waste.controller;

import com.campus.waste.common.R;
import com.campus.waste.entity.WasteCategory;
import com.campus.waste.entity.WasteItem;
import com.campus.waste.model.dto.ImageRecognitionDTO;
import com.campus.waste.model.vo.WasteCategoryVO;
import com.campus.waste.model.vo.WasteItemVO;
import com.campus.waste.service.WasteClassificationService;
import org.springframework.security.access.prepost.PreAuthorize;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import java.util.List;

@RestController
@RequestMapping("/waste")
public class WasteClassificationController {

    private final WasteClassificationService wasteClassificationService;

    public WasteClassificationController(WasteClassificationService wasteClassificationService) {
        this.wasteClassificationService = wasteClassificationService;
    }

    @GetMapping("/categories")
    public R<List<WasteCategoryVO>> getAllCategories() {
        return R.ok(wasteClassificationService.getAllCategories());
    }

    @GetMapping("/items/{categoryId}")
    public R<List<WasteItemVO>> getItemsByCategory(@PathVariable Long categoryId) {
        return R.ok(wasteClassificationService.getItemsByCategory(categoryId));
    }

    @GetMapping("/items/search")
    public R<List<WasteItemVO>> searchItems(@RequestParam String keyword) {
        return R.ok(wasteClassificationService.searchItems(keyword));
    }

    @PostMapping("/recognize")
    public R<ImageRecognitionDTO> recognizeImage(@RequestParam("file") MultipartFile image,
                                               @RequestParam Long userId) {
        return R.ok(wasteClassificationService.recognizeImage(image, userId));
    }

    @PostMapping("/category")
    @PreAuthorize("hasRole('ADMIN')")
    public R<Void> addCategory(@RequestBody WasteCategory category) {
        wasteClassificationService.addCategory(category);
        return R.ok();
    }

    @PostMapping("/item")
    @PreAuthorize("hasRole('ADMIN')")
    public R<Void> addItem(@RequestBody WasteItem item) {
        wasteClassificationService.addItem(item);
        return R.ok();
    }

    @PutMapping("/category")
    @PreAuthorize("hasRole('ADMIN')")
    public R<Void> updateCategory(@RequestBody WasteCategory category) {
        wasteClassificationService.updateCategory(category);
        return R.ok();
    }

    @PutMapping("/item")
    @PreAuthorize("hasRole('ADMIN')")
    public R<Void> updateItem(@RequestBody WasteItem item) {
        wasteClassificationService.updateItem(item);
        return R.ok();
    }

    @DeleteMapping("/category/{categoryId}")
    @PreAuthorize("hasRole('ADMIN')")
    public R<Void> deleteCategory(@PathVariable Long categoryId) {
        wasteClassificationService.deleteCategory(categoryId);
        return R.ok();
    }

    @DeleteMapping("/item/{itemId}")
    @PreAuthorize("hasRole('ADMIN')")
    public R<Void> deleteItem(@PathVariable Long itemId) {
        wasteClassificationService.deleteItem(itemId);
        return R.ok();
    }
}

backend\src\main\java\com\campus\waste\entity\Achievement.java

package com.campus.waste.entity;

import com.baomidou.mybatisplus.annotation.*;
import lombok.Data;
import java.time.LocalDateTime;

@Data
@TableName("achievement")
public class Achievement {
    @TableId(type = IdType.AUTO)
    private Long id;
    
    private String name;
    
    private String description;
    
    private String iconUrl;
    
    private Integer type;
    
    private Integer targetValue;
    
    private Integer pointsReward;
    
    @TableField(fill = FieldFill.INSERT)
    private LocalDateTime createTime;
}

backend\src\main\java\com\campus\waste\entity\BinAlert.java

package com.campus.waste.entity;

import com.baomidou.mybatisplus.annotation.*;
import lombok.Data;
import java.time.LocalDateTime;

@Data
@TableName("bin_alert")
public class BinAlert {
    @TableId(type = IdType.AUTO)
    private Long id;
    
    private Long binId;
    
    private Integer alertType;
    
    private String alertValue;
    
    private LocalDateTime alertTime;
    
    private LocalDateTime processedTime;
    
    private String processor;
    
    private String processResult;
    
    private Integer status;
    
    @TableField(fill = FieldFill.INSERT)
    private LocalDateTime createTime;
    
    @TableField(fill = FieldFill.INSERT_UPDATE)
    private LocalDateTime updateTime;
}

backend\src\main\java\com\campus\waste\entity\ClassificationStats.java

package com.campus.waste.entity;

import com.baomidou.mybatisplus.annotation.*;
import lombok.Data;
import java.time.LocalDate;
import java.time.LocalDateTime;

@Data
@TableName("classification_stats")
public class ClassificationStats {
    @TableId(type = IdType.AUTO)
    private Long id;
    
    private Long userId;
    
    private Long categoryId;
    
    private Integer totalCount;
    
    private Integer correctCount;
    
    private LocalDate statsDate;
    
    @TableField(fill = FieldFill.INSERT)
    private LocalDateTime createTime;
    
    @TableField(fill = FieldFill.INSERT_UPDATE)
    private LocalDateTime updateTime;
}

backend\src\main\java\com\campus\waste\entity\DisposalBehavior.java

package com.campus.waste.entity;

import com.baomidou.mybatisplus.annotation.*;
import lombok.Data;
import java.math.BigDecimal;
import java.time.LocalDateTime;

@Data
@TableName("disposal_behavior")
public class DisposalBehavior {
    @TableId(type = IdType.AUTO)
    private Long id;
    
    private Long userId;
    
    private String wasteType;
    
    private LocalDateTime disposalTime;
    
    private String location;
    
    private BigDecimal weight;
    
    private Boolean isCorrect;
    
    private String errorType;
    
    @TableField(fill = FieldFill.INSERT)
    private LocalDateTime createTime;
}

backend\src\main\java\com\campus\waste\entity\DisposalRecord.java

package com.campus.waste.entity;

import com.baomidou.mybatisplus.annotation.*;
import lombok.Data;
import java.time.LocalDateTime;
import java.math.BigDecimal;

@Data
@TableName("disposal_record")
public class DisposalRecord {
    @TableId(type = IdType.AUTO)
    private Long id;
    
    private Long binId;
    
    private Long userId;
    
    private Long wasteTypeId;
    
    private BigDecimal weight;
    
    private BigDecimal volume;
    
    private Integer isCorrect;
    
    private String correctionNote;
    
    private LocalDateTime disposalTime;
    
    @TableField(fill = FieldFill.INSERT)
    private LocalDateTime createTime;
}

backend\src\main\java\com\campus\waste\entity\EffectivenessReport.java

package com.campus.waste.entity;

import com.baomidou.mybatisplus.annotation.*;
import lombok.Data;
import java.math.BigDecimal;
import java.time.LocalDate;
import java.time.LocalDateTime;

@Data
@TableName("effectiveness_report")
public class EffectivenessReport {
    @TableId(type = IdType.AUTO)
    private Long id;
    
    private LocalDate reportDate;
    
    private Integer totalUsers;
    
    private Integer activeUsers;
    
    private BigDecimal totalWeight;
    
    private BigDecimal correctRate;
    
    private BigDecimal reductionRate;
    
    private BigDecimal satisfactionRate;
    
    private String mainProblems;
    
    private String suggestions;
    
    @TableField(fill = FieldFill.INSERT)
    private LocalDateTime createTime;
    
    @TableField(fill = FieldFill.INSERT_UPDATE)
    private LocalDateTime updateTime;
}

backend\src\main\java\com\campus\waste\entity\FAQ.java

package com.campus.waste.entity;

import com.baomidou.mybatisplus.annotation.*;
import lombok.Data;
import java.time.LocalDateTime;

@Data
@TableName("faq")
public class FAQ {
    @TableId(type = IdType.AUTO)
    private Long id;
    
    private String question;
    
    private String answer;
    
    private Long categoryId;
    
    private Integer viewCount;
    
    private Integer sortOrder;
    
    @TableField(fill = FieldFill.INSERT)
    private LocalDateTime createTime;
    
    @TableField(fill = FieldFill.INSERT_UPDATE)
    private LocalDateTime updateTime;
}

backend\src\main\java\com\campus\waste\entity\KnowledgeArticle.java

package com.campus.waste.entity;

import com.baomidou.mybatisplus.annotation.*;
import lombok.Data;
import java.time.LocalDateTime;

@Data
@TableName("knowledge_article")
public class KnowledgeArticle {
    @TableId(type = IdType.AUTO)
    private Long id;
    
    private String title;
    
    private String content;
    
    private Long categoryId;
    
    private String author;
    
    private Integer viewCount;
    
    private Integer status;
    
    @TableField(fill = FieldFill.INSERT)
    private LocalDateTime createTime;
    
    @TableField(fill = FieldFill.INSERT_UPDATE)
    private LocalDateTime updateTime;
}

backend\src\main\java\com\campus\waste\entity\PointsExchange.java

package com.campus.waste.entity;

import com.baomidou.mybatisplus.annotation.*;
import lombok.Data;
import java.time.LocalDateTime;

@Data
@TableName("points_exchange")
public class PointsExchange {
    @TableId(type = IdType.AUTO)
    private Long id;
    
    private Long userId;
    
    private Long productId;
    
    private Integer pointsCost;
    
    private Integer quantity;
    
    private Integer status;
    
    private String receiverName;
    
    private String receiverPhone;
    
    private String receiverAddress;
    
    @TableField(fill = FieldFill.INSERT)
    private LocalDateTime createTime;
    
    @TableField(fill = FieldFill.INSERT_UPDATE)
    private LocalDateTime updateTime;
}

backend\src\main\java\com\campus\waste\entity\PointsProduct.java

package com.campus.waste.entity;

import com.baomidou.mybatisplus.annotation.*;
import lombok.Data;
import java.time.LocalDateTime;

@Data
@TableName("points_product")
public class PointsProduct {
    @TableId(type = IdType.AUTO)
    private Long id;
    
    private String name;
    
    private String description;
    
    private String imageUrl;
    
    private Integer points;
    
    private Integer stock;
    
    private Integer totalStock;
    
    private Integer exchangeLimit;
    
    private Integer status;
    
    private LocalDateTime startTime;
    
    private LocalDateTime endTime;
    
    @TableField(fill = FieldFill.INSERT)
    private LocalDateTime createTime;
    
    @TableField(fill = FieldFill.INSERT_UPDATE)
    private LocalDateTime updateTime;
}

backend\src\main\java\com\campus\waste\entity\PointsRecord.java

package com.campus.waste.entity;

import com.baomidou.mybatisplus.annotation.*;
import lombok.Data;
import java.time.LocalDateTime;

@Data
@TableName("points_record")
public class PointsRecord {
    @TableId(type = IdType.AUTO)
    private Long id;
    
    private Long userId;
    
    private Integer points;
    
    private Integer type;
    
    private Long sourceId;
    
    private String sourceType;
    
    private String description;
    
    @TableField(fill = FieldFill.INSERT)
    private LocalDateTime createTime;
}

backend\src\main\java\com\campus\waste\entity\SmartBin.java

package com.campus.waste.entity;

import com.baomidou.mybatisplus.annotation.*;
import lombok.Data;
import java.time.LocalDateTime;
import java.math.BigDecimal;

@Data
@TableName("smart_bin")
public class SmartBin {
    @TableId(type = IdType.AUTO)
    private Long id;
    
    private String binCode;
    
    private String location;
    
    private Long categoryId;
    
    private Integer capacity;
    
    private Integer currentVolume;
    
    private Integer batteryLevel;
    
    private BigDecimal temperature;
    
    private BigDecimal humidity;
    
    private Integer status;
    
    private Integer alertThreshold;
    
    private LocalDateTime lastCleanedTime;
    
    @TableField(fill = FieldFill.INSERT)
    private LocalDateTime createTime;
    
    @TableField(fill = FieldFill.INSERT_UPDATE)
    private LocalDateTime updateTime;
}

backend\src\main\java\com\campus\waste\entity\TrendPrediction.java

package com.campus.waste.entity;

import com.baomidou.mybatisplus.annotation.*;
import lombok.Data;
import java.math.BigDecimal;
import java.time.LocalDate;
import java.time.LocalDateTime;

@Data
@TableName("trend_prediction")
public class TrendPrediction {
    @TableId(type = IdType.AUTO)
    private Long id;
    
    private LocalDate predictionDate;
    
    private String wasteType;
    
    private BigDecimal predictedWeight;
    
    private Integer predictedCount;
    
    private BigDecimal confidenceLevel;
    
    private String influencingFactors;
    
    @TableField(fill = FieldFill.INSERT)
    private LocalDateTime createTime;
    
    @TableField(fill = FieldFill.INSERT_UPDATE)
    private LocalDateTime updateTime;
}

backend\src\main\java\com\campus\waste\entity\User.java

package com.campus.waste.entity;

import com.baomidou.mybatisplus.annotation.*;
import lombok.Data;
import java.time.LocalDateTime;

@Data
@TableName("sys_user")
public class User {
    
    @TableId(type = IdType.AUTO)
    private Long id;
    
    private String username;
    
    private String password;
    
    private String realName;
    
    private String email;
    
    private String phone;
    
    private String avatar;
    
    /**
     * 用户类型（0管理员，1教师，2学生）
     */
    private Integer userType;
    
    /**
     * 帐号状态（0正常 1停用）
     */
    private Integer status;
    
    @TableField(fill = FieldFill.INSERT)
    private LocalDateTime createTime;
    
    @TableField(fill = FieldFill.INSERT_UPDATE)
    private LocalDateTime updateTime;
    
    @TableLogic
    private Integer delFlag;
}

backend\src\main\java\com\campus\waste\entity\UserAchievement.java

package com.campus.waste.entity;

import com.baomidou.mybatisplus.annotation.*;
import lombok.Data;
import java.time.LocalDateTime;

@Data
@TableName("user_achievement")
public class UserAchievement {
    @TableId(type = IdType.AUTO)
    private Long id;
    
    private Long userId;
    
    private Long achievementId;
    
    private Integer currentValue;
    
    private Integer isCompleted;
    
    private LocalDateTime completeTime;
    
    @TableField(fill = FieldFill.INSERT)
    private LocalDateTime createTime;
    
    @TableField(fill = FieldFill.INSERT_UPDATE)
    private LocalDateTime updateTime;
}

backend\src\main\java\com\campus\waste\entity\UserPoints.java

package com.campus.waste.entity;

import com.baomidou.mybatisplus.annotation.*;
import lombok.Data;
import java.time.LocalDateTime;

@Data
@TableName("user_points")
public class UserPoints {
    @TableId(type = IdType.AUTO)
    private Long id;
    
    private Long userId;
    
    private Integer totalPoints;
    
    private Integer availablePoints;
    
    private Integer level;
    
    @TableField(fill = FieldFill.INSERT)
    private LocalDateTime createTime;
    
    @TableField(fill = FieldFill.INSERT_UPDATE)
    private LocalDateTime updateTime;
}

backend\src\main\java\com\campus\waste\entity\WasteCategory.java

package com.campus.waste.entity;

import com.baomidou.mybatisplus.annotation.*;
import lombok.Data;
import java.time.LocalDateTime;

@Data
@TableName("waste_category")
public class WasteCategory {
    @TableId(type = IdType.AUTO)
    private Long id;
    
    private String categoryName;
    
    private String categoryCode;
    
    private String description;
    
    private String disposalGuide;
    
    private String categoryIcon;
    
    private Integer sortOrder;
    
    @TableField(fill = FieldFill.INSERT)
    private LocalDateTime createTime;
    
    @TableField(fill = FieldFill.INSERT_UPDATE)
    private LocalDateTime updateTime;
}

backend\src\main\java\com\campus\waste\entity\WasteItem.java

package com.campus.waste.entity;

import com.baomidou.mybatisplus.annotation.*;
import lombok.Data;
import java.time.LocalDateTime;

@Data
@TableName("waste_item")
public class WasteItem {
    @TableId(type = IdType.AUTO)
    private Long id;
    
    private String itemName;
    
    private Long categoryId;
    
    private String keywords;
    
    private String description;
    
    private String disposalMethod;
    
    private String imageUrl;
    
    @TableField(fill = FieldFill.INSERT)
    private LocalDateTime createTime;
    
    @TableField(fill = FieldFill.INSERT_UPDATE)
    private LocalDateTime updateTime;
}

backend\src\main\java\com\campus\waste\entity\WasteStatistics.java

package com.campus.waste.entity;

import com.baomidou.mybatisplus.annotation.*;
import lombok.Data;
import java.math.BigDecimal;
import java.time.LocalDate;
import java.time.LocalDateTime;

@Data
@TableName("waste_statistics")
public class WasteStatistics {
    @TableId(type = IdType.AUTO)
    private Long id;
    
    private String wasteType;
    
    private BigDecimal weight;
    
    private Integer count;
    
    private BigDecimal correctRate;
    
    private LocalDate collectionTime;
    
    @TableField(fill = FieldFill.INSERT)
    private LocalDateTime createTime;
    
    @TableField(fill = FieldFill.INSERT_UPDATE)
    private LocalDateTime updateTime;
}

backend\src\main\java\com\campus\waste\model\dto\ImageRecognitionDTO.java

package com.campus.waste.model.dto;

import lombok.Data;

@Data
public class ImageRecognitionDTO {
    private Long wasteItemId;
    private String itemName;
    private String categoryName;
    private String disposalMethod;
    private Double confidence;
    private String imageUrl;
}

backend\src\main\java\com\campus\waste\model\dto\LoginDTO.java

package com.campus.waste.model.dto;

import lombok.Data;

import javax.validation.constraints.NotBlank;

@Data
public class LoginDTO {
    @NotBlank(message = "用户名不能为空")
    private String username;

    @NotBlank(message = "密码不能为空")
    private String password;
}

backend\src\main\java\com\campus\waste\model\dto\UserDTO.java

package com.campus.waste.model.dto;

import lombok.Data;

import javax.validation.constraints.Email;
import javax.validation.constraints.NotBlank;
import javax.validation.constraints.Pattern;

@Data
public class UserDTO {
    private Long id;

    @NotBlank(message = "用户名不能为空")
    private String username;

    private String password;

    @NotBlank(message = "真实姓名不能为空")
    private String realName;

    @Email(message = "邮箱格式不正确")
    private String email;

    @Pattern(regexp = "^1[3-9]\\d{9}$", message = "手机号格式不正确")
    private String phone;

    private String avatar;

    private Integer userType;
}

backend\src\main\java\com\campus\waste\model\vo\BinAlertVO.java

package com.campus.waste.model.vo;

import lombok.Data;
import java.time.LocalDateTime;

@Data
public class BinAlertVO {
    private Long id;
    private Long binId;
    private String binCode;
    private String location;
    private Integer alertType;
    private String alertValue;
    private LocalDateTime alertTime;
    private LocalDateTime processedTime;
    private String processor;
    private String processResult;
    private Integer status;
}

backend\src\main\java\com\campus\waste\model\vo\BinMonitoringVO.java

package com.campus.waste.model.vo;

import lombok.Data;
import java.math.BigDecimal;

@Data
public class BinMonitoringVO {
    private Long id;
    private String binCode;
    private String location;
    private String categoryName;
    private Integer capacity;
    private Integer currentVolume;
    private Double usageRate;
    private Integer batteryLevel;
    private BigDecimal temperature;
    private BigDecimal humidity;
    private Integer status;
}

backend\src\main\java\com\campus\waste\model\vo\BinVolumeStatVO.java

package com.campus.waste.model.vo;

import lombok.Data;
import java.time.LocalDateTime;

@Data
public class BinVolumeStatVO {
    private LocalDateTime time;
    private Integer volume;
    private Double usageRate;
}

backend\src\main\java\com\campus\waste\model\vo\ClassificationStatsVO.java

package com.campus.waste.model.vo;

import lombok.Data;
import java.time.LocalDate;

@Data
public class ClassificationStatsVO {
    private Long id;
    private Long userId;
    private String username;
    private Long categoryId;
    private String categoryName;
    private Integer totalCount;
    private Integer correctCount;
    private Double accuracy;
    private LocalDate statsDate;
}

backend\src\main\java\com\campus\waste\model\vo\DisposalRecordVO.java

package com.campus.waste.model.vo;

import lombok.Data;
import java.math.BigDecimal;
import java.time.LocalDateTime;

@Data
public class DisposalRecordVO {
    private Long id;
    private Long binId;
    private String binCode;
    private Long userId;
    private String username;
    private Long wasteTypeId;
    private String wasteTypeName;
    private BigDecimal weight;
    private BigDecimal volume;
    private Integer isCorrect;
    private String correctionNote;
    private LocalDateTime disposalTime;
}

backend\src\main\java\com\campus\waste\model\vo\FAQVO.java

package com.campus.waste.model.vo;

import lombok.Data;
import java.time.LocalDateTime;

@Data
public class FAQVO {
    private Long id;
    private String question;
    private String answer;
    private Long categoryId;
    private Integer viewCount;
    private Integer sortOrder;
    private LocalDateTime createTime;
    private LocalDateTime updateTime;
}

backend\src\main\java\com\campus\waste\model\vo\KnowledgeArticleVO.java

package com.campus.waste.model.vo;

import lombok.Data;
import java.time.LocalDateTime;

@Data
public class KnowledgeArticleVO {
    private Long id;
    private String title;
    private String content;
    private Long categoryId;
    private String author;
    private Integer viewCount;
    private Integer status;
    private LocalDateTime createTime;
    private LocalDateTime updateTime;
}

backend\src\main\java\com\campus\waste\model\vo\LoginVO.java

package com.campus.waste.model.vo;

import lombok.Data;

@Data
public class LoginVO {
    private String token;
    private String tokenType;
}

backend\src\main\java\com\campus\waste\model\vo\SmartBinDetailVO.java

package com.campus.waste.model.vo;

import lombok.Data;
import java.math.BigDecimal;
import java.time.LocalDateTime;

@Data
public class SmartBinDetailVO {
    private Long id;
    private String binCode;
    private String location;
    private Long categoryId;
    private String categoryName;
    private Integer capacity;
    private Integer currentVolume;
    private Double usageRate;
    private Integer batteryLevel;
    private BigDecimal temperature;
    private BigDecimal humidity;
    private Integer status;
    private Integer alertThreshold;
    private LocalDateTime lastCleanedTime;
    private LocalDateTime createTime;
    private LocalDateTime updateTime;
}

backend\src\main\java\com\campus\waste\model\vo\SmartBinVO.java

package com.campus.waste.model.vo;

import lombok.Data;
import java.math.BigDecimal;
import java.time.LocalDateTime;

@Data
public class SmartBinVO {
    private Long id;
    private String binCode;
    private String location;
    private Long categoryId;
    private Integer capacity;
    private Integer currentVolume;
    private Integer batteryLevel;
    private BigDecimal temperature;
    private BigDecimal humidity;
    private Integer status;
    private LocalDateTime lastCleanedTime;
}

backend\src\main\java\com\campus\waste\model\vo\UserVO.java

package com.campus.waste.model.vo;

import lombok.Data;
import java.time.LocalDateTime;

@Data
public class UserVO {
    private Long id;
    private String username;
    private String password;
    private String realName;
    private String email;
    private String phone;
    private String avatar;
    private Integer userType;
    private Integer status;
    private LocalDateTime createTime;
    private LocalDateTime updateTime;
}

backend\src\main\java\com\campus\waste\model\vo\WasteCategoryVO.java

package com.campus.waste.model.vo;

import lombok.Data;

@Data
public class WasteCategoryVO {
    private Long id;
    private String categoryName;
    private String categoryCode;
    private String description;
    private String disposalGuide;
    private String categoryIcon;
    private Integer sortOrder;
}

backend\src\main\java\com\campus\waste\model\vo\WasteItemVO.java

package com.campus.waste.model.vo;

import lombok.Data;

@Data
public class WasteItemVO {
    private Long id;
    private String itemName;
    private Long categoryId;
    private String categoryName;
    private String keywords;
    private String description;
    private String disposalMethod;
    private String imageUrl;
}

backend\src\main\java\com\campus\waste\security\JwtAuthenticationFilter.java

package com.campus.waste.security;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.web.authentication.WebAuthenticationDetailsSource;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.filter.OncePerRequestFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Component
public class JwtAuthenticationFilter extends OncePerRequestFilter {

    @Value("${jwt.token-start-with}")
    private String tokenStartWith;

    private final JwtTokenProvider tokenProvider;
    private final CustomUserDetailsService customUserDetailsService;

    public JwtAuthenticationFilter(JwtTokenProvider tokenProvider, CustomUserDetailsService customUserDetailsService) {
        this.tokenProvider = tokenProvider;
        this.customUserDetailsService = customUserDetailsService;
    }

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)
            throws ServletException, IOException {
        try {
            String jwt = getJwtFromRequest(request);

            if (StringUtils.hasText(jwt) && tokenProvider.validateToken(jwt)) {
                Long userId = tokenProvider.getUserIdFromJWT(jwt);

                UserDetails userDetails = customUserDetailsService.loadUserById(userId);
                UsernamePasswordAuthenticationToken authentication = new UsernamePasswordAuthenticationToken(
                        userDetails, null, userDetails.getAuthorities());
                authentication.setDetails(new WebAuthenticationDetailsSource().buildDetails(request));

                SecurityContextHolder.getContext().setAuthentication(authentication);
            }
        } catch (Exception ex) {
            logger.error("Could not set user authentication in security context", ex);
        }

        filterChain.doFilter(request, response);
    }

    private String getJwtFromRequest(HttpServletRequest request) {
        String bearerToken = request.getHeader("Authorization");
        if (StringUtils.hasText(bearerToken) && bearerToken.startsWith(tokenStartWith)) {
            return bearerToken.substring(tokenStartWith.length());
        }
        return null;
    }
}

backend\src\main\java\com\campus\waste\security\JwtTokenProvider.java

package com.campus.waste.security;

import io.jsonwebtoken.*;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.security.core.Authentication;
import org.springframework.stereotype.Component;

import java.util.Date;

@Component
public class JwtTokenProvider {

    @Value("${jwt.secret}")
    private String jwtSecret;

    @Value("${jwt.expiration}")
    private int jwtExpirationInMs;

    public String generateToken(Authentication authentication) {
        UserPrincipal userPrincipal = (UserPrincipal) authentication.getPrincipal();

        Date now = new Date();
        Date expiryDate = new Date(now.getTime() + jwtExpirationInMs * 1000);

        return Jwts.builder()
                .setSubject(Long.toString(userPrincipal.getId()))
                .setIssuedAt(new Date())
                .setExpiration(expiryDate)
                .signWith(SignatureAlgorithm.HS512, jwtSecret)
                .compact();
    }

    public Long getUserIdFromJWT(String token) {
        Claims claims = Jwts.parser()
                .setSigningKey(jwtSecret)
                .parseClaimsJws(token)
                .getBody();

        return Long.parseLong(claims.getSubject());
    }

    public boolean validateToken(String authToken) {
        try {
            Jwts.parser().setSigningKey(jwtSecret).parseClaimsJws(authToken);
            return true;
        } catch (SignatureException ex) {
            // 无效的JWT签名
            return false;
        } catch (MalformedJwtException ex) {
            // 无效的JWT令牌
            return false;
        } catch (ExpiredJwtException ex) {
            // 过期的JWT令牌
            return false;
        } catch (UnsupportedJwtException ex) {
            // 不支持的JWT令牌
            return false;
        } catch (IllegalArgumentException ex) {
            // JWT声明字符串为空
            return false;
        }
    }
}

backend\src\main\java\com\campus\waste\service\AchievementService.java

package com.campus.waste.service;

import com.campus.waste.entity.*;
import com.campus.waste.model.vo.*;
import java.util.List;

public interface AchievementService {
    
    /**
     * 获取所有成就列表
     */
    List<AchievementVO> getAllAchievements();
    
    /**
     * 获取用户成就列表
     */
    List<UserAchievementVO> getUserAchievements(Long userId);
    
    /**
     * 检查并更新用户成就
     */
    void checkAndUpdateAchievements(Long userId, Integer type, Integer value);
    
    /**
     * 获取用户最近完成的成就
     */
    List<UserAchievementVO> getRecentCompletedAchievements(Long userId, Integer limit);
    
    /**
     * 获取用户成就统计
     */
    AchievementStatsVO getUserAchievementStats(Long userId);
}

backend\src\main\java\com\campus\waste\service\DataAnalysisService.java

package com.campus.waste.service;

import com.campus.waste.entity.*;
import com.campus.waste.model.vo.*;
import java.time.LocalDate;
import java.util.List;
import java.util.Map;

public interface DataAnalysisService {
    
    /**
     * 获取垃圾分类统计数据
     */
    List<WasteStatisticsVO> getWasteStatistics(LocalDate startDate, LocalDate endDate, String wasteType);
    
    /**
     * 获取投放行为分析数据
     */
    DisposalBehaviorAnalysisVO getDisposalBehaviorAnalysis(LocalDate startDate, LocalDate endDate);
    
    /**
     * 获取用户投放行为详情
     */
    List<DisposalBehaviorVO> getUserDisposalBehaviors(Long userId, LocalDate startDate, LocalDate endDate);
    
    /**
     * 获取效果评估报告
     */
    EffectivenessReportVO getEffectivenessReport(LocalDate reportDate);
    
    /**
     * 生成效果评估报告
     */
    void generateEffectivenessReport(LocalDate reportDate);
    
    /**
     * 获取趋势预测数据
     */
    List<TrendPredictionVO> getTrendPrediction(String wasteType, Integer predictionMonths);
    
    /**
     * 更新趋势预测
     */
    void updateTrendPrediction(String wasteType);
    
    /**
     * 获取数据分析概览
     */
    Map<String, Object> getDataAnalysisOverview();
    
    /**
     * 获取时段分析数据
     */
    List<TimeAnalysisVO> getTimeAnalysis(LocalDate startDate, LocalDate endDate);
    
    /**
     * 获取区域分析数据
     */
    List<RegionAnalysisVO> getRegionAnalysis(LocalDate startDate, LocalDate endDate);
    
    /**
     * 导出分析报告
     */
    byte[] exportAnalysisReport(LocalDate startDate, LocalDate endDate);
}

backend\src\main\java\com\campus\waste\service\DisposalManagementService.java

package com.campus.waste.service;

import com.campus.waste.entity.SmartBin;
import com.campus.waste.entity.DisposalRecord;
import com.campus.waste.entity.BinAlert;
import com.campus.waste.model.vo.*;
import com.baomidou.mybatisplus.core.metadata.IPage;
import java.util.List;

public interface DisposalManagementService {
    
    /**
     * 获取所有垃圾箱列表
     */
    List<SmartBinVO> getAllBins();
    
    /**
     * 获取垃圾箱详情
     */
    SmartBinDetailVO getBinDetail(Long binId);
    
    /**
     * 更新垃圾箱状态
     */
    void updateBinStatus(Long binId, Integer status);
    
    /**
     * 记录垃圾投放
     */
    void recordDisposal(DisposalRecord record);
    
    /**
     * 获取投放记录
     */
    IPage<DisposalRecordVO> getDisposalRecords(Long binId, Long userId, Integer pageNum, Integer pageSize);
    
    /**
     * 获取未处理的预警
     */
    List<BinAlertVO> getUnprocessedAlerts();
    
    /**
     * 处理预警
     */
    void processAlert(Long alertId, String processor, String processResult);
    
    /**
     * 获取分类准确率统计
     */
    List<ClassificationStatsVO> getClassificationStats(Long userId, String timeRange);
    
    /**
     * 检查并生成容量预警
     */
    void checkAndGenerateVolumeAlerts();
    
    /**
     * 获取实时监控数据
     */
    List<BinMonitoringVO> getBinMonitoringData();
    
    /**
     * 清空垃圾箱
     */
    void cleanBin(Long binId);
    
    /**
     * 获取垃圾箱容量趋势
     */
    List<BinVolumeStatVO> getBinVolumeTrend(Long binId, String timeRange);
}

backend\src\main\java\com\campus\waste\service\KnowledgeService.java

package com.campus.waste.service;

import com.campus.waste.entity.KnowledgeArticle;
import com.campus.waste.entity.FAQ;
import com.campus.waste.model.vo.KnowledgeArticleVO;
import com.campus.waste.model.vo.FAQVO;
import com.baomidou.mybatisplus.core.metadata.IPage;

import java.util.List;

public interface KnowledgeService {
    
    /**
     * 获取文章列表
     */
    IPage<KnowledgeArticleVO> getArticleList(Long categoryId, Integer pageNum, Integer pageSize);
    
    /**
     * 获取文章详情
     */
    KnowledgeArticleVO getArticleDetail(Long articleId);
    
    /**
     * 添加文章
     */
    void addArticle(KnowledgeArticle article);
    
    /**
     * 更新文章
     */
    void updateArticle(KnowledgeArticle article);
    
    /**
     * 删除文章
     */
    void deleteArticle(Long articleId);
    
    /**
     * 获取FAQ列表
     */
    List<FAQVO> getFAQList(Long categoryId);
    
    /**
     * 添加FAQ
     */
    void addFAQ(FAQ faq);
    
    /**
     * 更新FAQ
     */
    void updateFAQ(FAQ faq);
    
    /**
     * 删除FAQ
     */
    void deleteFAQ(Long faqId);
    
    /**
     * 增加文章浏览次数
     */
    void incrementArticleViewCount(Long articleId);
    
    /**
     * 增加FAQ浏览次数
     */
    void incrementFAQViewCount(Long faqId);
}

backend\src\main\java\com\campus\waste\service\PointsService.java

package com.campus.waste.service;

import com.campus.waste.entity.*;
import com.campus.waste.model.vo.*;
import com.baomidou.mybatisplus.core.metadata.IPage;
import java.util.List;

public interface PointsService {
    
    /**
     * 获取用户积分信息
     */
    UserPointsVO getUserPoints(Long userId);
    
    /**
     * 增加用户积分
     */
    void addPoints(Long userId, Integer points, Integer type, Long sourceId, String sourceType, String description);
    
    /**
     * 扣减用户积分
     */
    boolean deductPoints(Long userId, Integer points, Integer type, Long sourceId, String sourceType, String description);
    
    /**
     * 获取用户积分记录
     */
    IPage<PointsRecordVO> getPointsRecords(Long userId, Integer type, Integer pageNum, Integer pageSize);
    
    /**
     * 获取积分商城商品列表
     */
    List<PointsProductVO> getProductList(Boolean includeOffShelf);
    
    /**
     * 兑换商品
     */
    void exchangeProduct(Long userId, Long productId, Integer quantity, String receiverName, String receiverPhone, String receiverAddress);
    
    /**
     * 获取用户兑换记录
     */
    IPage<PointsExchangeVO> getExchangeRecords(Long userId, Integer status, Integer pageNum, Integer pageSize);
    
    /**
     * 获取积分排行榜
     */
    List<PointsRankingVO> getPointsRanking(String timeRange);
    
    /**
     * 更新兑换记录状态
     */
    void updateExchangeStatus(Long exchangeId, Integer status);
    
    /**
     * 检查并更新用户等级
     */
    void checkAndUpdateLevel(Long userId);
}

backend\src\main\java\com\campus\waste\service\UserService.java

package com.campus.waste.service;

import com.campus.waste.entity.User;
import com.baomidou.mybatisplus.extension.service.IService;
import com.campus.waste.model.dto.UserDTO;
import com.campus.waste.model.vo.UserVO;
import java.util.List;

public interface UserService extends IService<User> {
    
    /**
     * 用户注册
     */
    void register(UserDTO userDTO);
    
    /**
     * 更新用户信息
     */
    void updateUserInfo(UserDTO userDTO);
    
    /**
     * 获取用户信息
     */
    UserVO getUserInfo(Long userId);
    
    /**
     * 获取用户列表
     */
    List<UserVO> getUserList(Integer userType);
    
    /**
     * 修改用户状态
     */
    void updateUserStatus(Long userId, Integer status);
    
    /**
     * 删除用户
     */
    void deleteUser(Long userId);
}

backend\src\main\java\com\campus\waste\service\WasteClassificationService.java

package com.campus.waste.service;

import com.campus.waste.entity.WasteCategory;
import com.campus.waste.entity.WasteItem;
import com.campus.waste.model.dto.ImageRecognitionDTO;
import com.campus.waste.model.vo.WasteCategoryVO;
import com.campus.waste.model.vo.WasteItemVO;
import org.springframework.web.multipart.MultipartFile;

import java.util.List;

public interface WasteClassificationService {
    
    /**
     * 获取所有垃圾分类
     */
    List<WasteCategoryVO> getAllCategories();
    
    /**
     * 根据分类ID获取物品列表
     */
    List<WasteItemVO> getItemsByCategory(Long categoryId);
    
    /**
     * 搜索垃圾物品
     */
    List<WasteItemVO> searchItems(String keyword);
    
    /**
     * 图像识别
     */
    ImageRecognitionDTO recognizeImage(MultipartFile image, Long userId);
    
    /**
     * 添加垃圾分类
     */
    void addCategory(WasteCategory category);
    
    /**
     * 添加垃圾物品
     */
    void addItem(WasteItem item);
    
    /**
     * 更新垃圾分类
     */
    void updateCategory(WasteCategory category);
    
    /**
     * 更新垃圾物品
     */
    void updateItem(WasteItem item);
    
    /**
     * 删除垃圾分类
     */
    void deleteCategory(Long categoryId);
    
    /**
     * 删除垃圾物品
     */
    void deleteItem(Long itemId);
}

backend\src\main\java\com\campus\waste\service\impl\AchievementServiceImpl.java

package com.campus.waste.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.campus.waste.entity.*;
import com.campus.waste.mapper.*;
import com.campus.waste.model.vo.*;
import com.campus.waste.service.AchievementService;
import com.campus.waste.service.PointsService;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.beans.BeanUtils;

import java.time.LocalDateTime;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
public class AchievementServiceImpl implements AchievementService {

    private final AchievementMapper achievementMapper;
    private final UserAchievementMapper userAchievementMapper;
    private final PointsService pointsService;

    public AchievementServiceImpl(AchievementMapper achievementMapper,
                                UserAchievementMapper userAchievementMapper,
                                PointsService pointsService) {
        this.achievementMapper = achievementMapper;
        this.userAchievementMapper = userAchievementMapper;
        this.pointsService = pointsService;
    }

    @Override
    public List<AchievementVO> getAllAchievements() {
        List<Achievement> achievements = achievementMapper.selectList(null);
        return achievements.stream()
                .map(this::convertToAchievementVO)
                .collect(Collectors.toList());
    }

    @Override
    public List<UserAchievementVO> getUserAchievements(Long userId) {
        // 获取所有成就
        List<Achievement> achievements = achievementMapper.selectList(null);
        
        // 获取用户已完成的成就
        List<UserAchievement> userAchievements = userAchievementMapper.selectList(
            new LambdaQueryWrapper<UserAchievement>()
                .eq(UserAchievement::getUserId, userId)
        );
        
        Map<Long, UserAchievement> userAchievementMap = userAchievements.stream()
                .collect(Collectors.toMap(UserAchievement::getAchievementId, ua -> ua));
        
        // 合并成就信息
        return achievements.stream()
                .map(achievement -> {
                    UserAchievementVO vo = new UserAchievementVO();
                    BeanUtils.copyProperties(achievement, vo);
                    
                    UserAchievement userAchievement = userAchievementMap.get(achievement.getId());
                    if (userAchievement != null) {
                        vo.setCurrentValue(userAchievement.getCurrentValue());
                        vo.setIsCompleted(userAchievement.getIsCompleted());
                        vo.setCompleteTime(userAchievement.getCompleteTime());
                    } else {
                        vo.setCurrentValue(0);
                        vo.setIsCompleted(0);
                    }
                    
                    return vo;
                })
                .collect(Collectors.toList());
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void checkAndUpdateAchievements(Long userId, Integer type, Integer value) {
        // 获取指定类型的未完成成就
        List<Achievement> achievements = achievementMapper.selectList(
            new LambdaQueryWrapper<Achievement>()
                .eq(Achievement::getType, type)
        );
        
        for (Achievement achievement : achievements) {
            UserAchievement userAchievement = userAchievementMapper.selectOne(
                new LambdaQueryWrapper<UserAchievement>()
                    .eq(UserAchievement::getUserId, userId)
                    .eq(UserAchievement::getAchievementId, achievement.getId())
            );
            
            if (userAchievement == null) {
                // 创建新的用户成就记录
                userAchievement = new UserAchievement();
                userAchievement.setUserId(userId);
                userAchievement.setAchievementId(achievement.getId());
                userAchievement.setCurrentValue(value);
                userAchievement.setIsCompleted(value >= achievement.getTargetValue() ? 1 : 0);
                if (userAchievement.getIsCompleted() == 1) {
                    userAchievement.setCompleteTime(LocalDateTime.now());
                    // 发放成就奖励
                    awardAchievementPoints(userId, achievement);
                }
                userAchievementMapper.insert(userAchievement);
            } else if (userAchievement.getIsCompleted() == 0) {
                // 更新进度
                userAchievement.setCurrentValue(value);
                if (value >= achievement.getTargetValue()) {
                    userAchievement.setIsCompleted(1);
                    userAchievement.setCompleteTime(LocalDateTime.now());
                    // 发放成就奖励
                    awardAchievementPoints(userId, achievement);
                }
                userAchievementMapper.updateById(userAchievement);
            }
        }
    }

    @Override
    public List<UserAchievementVO> getRecentCompletedAchievements(Long userId, Integer limit) {
        List<UserAchievement> userAchievements = userAchievementMapper.selectList(
            new LambdaQueryWrapper<UserAchievement>()
                .eq(UserAchievement::getUserId, userId)
                .eq(UserAchievement::getIsCompleted, 1)
                .orderByDesc(UserAchievement::getCompleteTime)
                .last("LIMIT " + limit)
        );
        
        return userAchievements.stream()
                .map(ua -> {
                    Achievement achievement = achievementMapper.selectById(ua.getAchievementId());
                    UserAchievementVO vo = new UserAchievementVO();
                    BeanUtils.copyProperties(achievement, vo);
                    vo.setCurrentValue(ua.getCurrentValue());
                    vo.setIsCompleted(ua.getIsCompleted());
                    vo.setCompleteTime(ua.getCompleteTime());
                    return vo;
                })
                .collect(Collectors.toList());
    }

    @Override
    public AchievementStatsVO getUserAchievementStats(Long userId) {
        AchievementStatsVO stats = new AchievementStatsVO();
        
        // 获取用户成就完成情况
        List<UserAchievement> userAchievements = userAchievementMapper.selectList(
            new LambdaQueryWrapper<UserAchievement>()
                .eq(UserAchievement::getUserId, userId)
        );
        
        // 获取所有成就总数
        int totalAchievements = achievementMapper.selectCount(null);
        
        // 计算完成数量
        long completedCount = userAchievements.stream()
                .filter(ua -> ua.getIsCompleted() == 1)
                .count();
        
        stats.setTotalCount(totalAchievements);
        stats.setCompletedCount((int) completedCount);
        stats.setCompletionRate(totalAchievements == 0 ? 0 : 
            (double) completedCount / totalAchievements * 100);
        
        return stats;
    }

    private void awardAchievementPoints(Long userId, Achievement achievement) {
        if (achievement.getPointsReward() > 0) {
            pointsService.addPoints(
                userId,
                achievement.getPointsReward(),
                3,
                achievement.getId(),
                "achievement_reward",
                "完成成就：" + achievement.getName()
            );
        }
    }

    private AchievementVO convertToAchievementVO(Achievement achievement) {
        AchievementVO vo = new AchievementVO();
        BeanUtils.copyProperties(achievement, vo);
        return vo;
    }
}

backend\src\main\java\com\campus\waste\service\impl\DataAnalysisServiceImpl.java

package com.campus.waste.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.campus.waste.entity.*;
import com.campus.waste.mapper.*;
import com.campus.waste.model.vo.*;
import com.campus.waste.service.DataAnalysisService;
import com.campus.waste.utils.ExcelUtils;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.apache.commons.math3.stat.regression.SimpleRegression;
import org.springframework.beans.BeanUtils;

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.temporal.ChronoUnit;
import java.util.*;
import java.util.stream.Collectors;
import java.math.BigDecimal;
import java.math.RoundingMode;

@Service
public class DataAnalysisServiceImpl implements DataAnalysisService {

    private final WasteStatisticsMapper wasteStatisticsMapper;
    private final DisposalBehaviorMapper disposalBehaviorMapper;
    private final EffectivenessReportMapper effectivenessReportMapper;
    private final TrendPredictionMapper trendPredictionMapper;

    public DataAnalysisServiceImpl(WasteStatisticsMapper wasteStatisticsMapper,
                                 DisposalBehaviorMapper disposalBehaviorMapper,
                                 EffectivenessReportMapper effectivenessReportMapper,
                                 TrendPredictionMapper trendPredictionMapper) {
        this.wasteStatisticsMapper = wasteStatisticsMapper;
        this.disposalBehaviorMapper = disposalBehaviorMapper;
        this.effectivenessReportMapper = effectivenessReportMapper;
        this.trendPredictionMapper = trendPredictionMapper;
    }

    @Override
    public List<WasteStatisticsVO> getWasteStatistics(LocalDate startDate, LocalDate endDate, String wasteType) {
        LambdaQueryWrapper<WasteStatistics> wrapper = new LambdaQueryWrapper<>();
        wrapper.ge(WasteStatistics::getCollectionTime, startDate)
               .le(WasteStatistics::getCollectionTime, endDate)
               .eq(wasteType != null, WasteStatistics::getWasteType, wasteType)
               .orderByAsc(WasteStatistics::getCollectionTime);

        List<WasteStatistics> statistics = wasteStatisticsMapper.selectList(wrapper);
        return statistics.stream()
                .map(this::convertToWasteStatisticsVO)
                .collect(Collectors.toList());
    }

    @Override
    public DisposalBehaviorAnalysisVO getDisposalBehaviorAnalysis(LocalDate startDate, LocalDate endDate) {
        List<DisposalBehavior> behaviors = disposalBehaviorMapper.selectList(
            new LambdaQueryWrapper<DisposalBehavior>()
                .ge(DisposalBehavior::getDisposalTime, startDate.atStartOfDay())
                .le(DisposalBehavior::getDisposalTime, endDate.atTime(23, 59, 59))
        );

        DisposalBehaviorAnalysisVO analysis = new DisposalBehaviorAnalysisVO();
        
        // 计算总体正确率
        long correctCount = behaviors.stream().filter(DisposalBehavior::getIsCorrect).count();
        analysis.setOverallCorrectRate(calculatePercentage(correctCount, behaviors.size()));

        // 按垃圾类型分组统计
        Map<String, List<DisposalBehavior>> typeGroups = behaviors.stream()
                .collect(Collectors.groupingBy(DisposalBehavior::getWasteType));
        
        List<TypeAnalysisVO> typeAnalysis = typeGroups.entrySet().stream()
                .map(entry -> {
                    TypeAnalysisVO vo = new TypeAnalysisVO();
                    vo.setWasteType(entry.getKey());
                    vo.setCount(entry.getValue().size());
                    long typeCorrectCount = entry.getValue().stream()
                            .filter(DisposalBehavior::getIsCorrect)
                            .count();
                    vo.setCorrectRate(calculatePercentage(typeCorrectCount, entry.getValue().size()));
                    return vo;
                })
                .collect(Collectors.toList());
        analysis.setTypeAnalysis(typeAnalysis);

        // 错误类型分析
        Map<String, Long> errorTypes = behaviors.stream()
                .filter(b -> !b.getIsCorrect())
                .collect(Collectors.groupingBy(
                    DisposalBehavior::getErrorType,
                    Collectors.counting()
                ));
        analysis.setErrorTypeAnalysis(errorTypes);

        return analysis;
    }

    @Override
    public List<DisposalBehaviorVO> getUserDisposalBehaviors(Long userId, LocalDate startDate, LocalDate endDate) {
        List<DisposalBehavior> behaviors = disposalBehaviorMapper.selectList(
            new LambdaQueryWrapper<DisposalBehavior>()
                .eq(DisposalBehavior::getUserId, userId)
                .ge(DisposalBehavior::getDisposalTime, startDate.atStartOfDay())
                .le(DisposalBehavior::getDisposalTime, endDate.atTime(23, 59, 59))
                .orderByDesc(DisposalBehavior::getDisposalTime)
        );

        return behaviors.stream()
                .map(this::convertToDisposalBehaviorVO)
                .collect(Collectors.toList());
    }

    @Override
    public EffectivenessReportVO getEffectivenessReport(LocalDate reportDate) {
        EffectivenessReport report = effectivenessReportMapper.selectOne(
            new LambdaQueryWrapper<EffectivenessReport>()
                .eq(EffectivenessReport::getReportDate, reportDate)
        );

        if (report == null) {
            generateEffectivenessReport(reportDate);
            report = effectivenessReportMapper.selectOne(
                new LambdaQueryWrapper<EffectivenessReport>()
                    .eq(EffectivenessReport::getReportDate, reportDate)
            );
        }

        return convertToEffectivenessReportVO(report);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void generateEffectivenessReport(LocalDate reportDate) {
        // 获取统计周期（前一天）
        LocalDateTime startTime = reportDate.atStartOfDay();
        LocalDateTime endTime = reportDate.atTime(23, 59, 59);

        // 查询当天的投放行为数据
        List<DisposalBehavior> behaviors = disposalBehaviorMapper.selectList(
            new LambdaQueryWrapper<DisposalBehavior>()
                .ge(DisposalBehavior::getDisposalTime, startTime)
                .le(DisposalBehavior::getDisposalTime, endTime)
        );

        // 统计数据
        Set<Long> activeUsers = behaviors.stream()
                .map(DisposalBehavior::getUserId)
                .collect(Collectors.toSet());

        BigDecimal totalWeight = behaviors.stream()
                .map(DisposalBehavior::getWeight)
                .reduce(BigDecimal.ZERO, BigDecimal::add);

        long correctCount = behaviors.stream()
                .filter(DisposalBehavior::getIsCorrect)
                .count();

        // 创建报告
        EffectivenessReport report = new EffectivenessReport();
        report.setReportDate(reportDate);
        report.setTotalUsers(1000); // TODO: 从用户表获取
        report.setActiveUsers(activeUsers.size());
        report.setTotalWeight(totalWeight);
        report.setCorrectRate(calculatePercentage(correctCount, behaviors.size()));
        report.setReductionRate(calculateReductionRate(reportDate));
        report.setSatisfactionRate(new BigDecimal("95.00")); // TODO: 从满意度调查获取
        report.setMainProblems(analyzeMainProblems(behaviors));
        report.setSuggestions(generateSuggestions(behaviors));

        // 保存报告
        effectivenessReportMapper.insert(report);
    }

    @Override
    public List<TrendPredictionVO> getTrendPrediction(String wasteType, Integer predictionMonths) {
        // 获取历史数据
        LocalDate endDate = LocalDate.now();
        LocalDate startDate = endDate.minusMonths(12); // 使用过去12个月的数据进行预测

        List<WasteStatistics> historicalData = wasteStatisticsMapper.selectList(
            new LambdaQueryWrapper<WasteStatistics>()
                .eq(WasteStatistics::getWasteType, wasteType)
                .ge(WasteStatistics::getCollectionTime, startDate)
                .le(WasteStatistics::getCollectionTime, endDate)
                .orderByAsc(WasteStatistics::getCollectionTime)
        );

        // 使用简单线性回归进行预测
        SimpleRegression regression = new SimpleRegression();
        for (int i = 0; i < historicalData.size(); i++) {
            regression.addData(i, historicalData.get(i).getWeight().doubleValue());
        }

        // 生成预测数据
        List<TrendPredictionVO> predictions = new ArrayList<>();
        LocalDate currentDate = endDate.plusDays(1);
        for (int i = 0; i < predictionMonths * 30; i++) {
            TrendPredictionVO prediction = new TrendPredictionVO();
            prediction.setPredictionDate(currentDate);
            prediction.setWasteType(wasteType);
            
            double predictedValue = regression.predict(historicalData.size() + i);
            prediction.setPredictedWeight(new BigDecimal(predictedValue).setScale(2, RoundingMode.HALF_UP));
            
            // 计算预测区间
            double[] interval = regression.getConfidenceInterval(historicalData.size() + i, 0.95);
            prediction.setConfidenceLevel(new BigDecimal("95.00"));
            prediction.setLowerBound(new BigDecimal(interval[0]).setScale(2, RoundingMode.HALF_UP));
            prediction.setUpperBound(new BigDecimal(interval[1]).setScale(2, RoundingMode.HALF_UP));
            
            predictions.add(prediction);
            currentDate = currentDate.plusDays(1);
        }

        return predictions;
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void updateTrendPrediction(String wasteType) {
        // 删除旧的预测数据
        trendPredictionMapper.delete(
            new LambdaQueryWrapper<TrendPrediction>()
                .eq(TrendPrediction::getWasteType, wasteType)
                .ge(TrendPrediction::getPredictionDate, LocalDate.now())
        );

        // 生成新的预测数据
        List<TrendPredictionVO> predictions = getTrendPrediction(wasteType, 3); // 预测未来3个月
        
        // 保存预测数据
        predictions.forEach(prediction -> {
            TrendPrediction entity = new TrendPrediction();
            BeanUtils.copyProperties(prediction, entity);
            trendPredictionMapper.insert(entity);
        });
    }

    @Override
    public Map<String, Object> getDataAnalysisOverview() {
        Map<String, Object> overview = new HashMap<>();
        LocalDate today = LocalDate.now();
        LocalDate startDate = today.minusDays(7);

        // 获取最近7天的数据
        List<WasteStatistics> weeklyStats = wasteStatisticsMapper.selectList(
            new LambdaQueryWrapper<WasteStatistics>()
                .ge(WasteStatistics::getCollectionTime, startDate)
                .le(WasteStatistics::getCollectionTime, today)
        );

        // 计算总量和增长率
        BigDecimal totalWeight = weeklyStats.stream()
                .map(WasteStatistics::getWeight)
                .reduce(BigDecimal.ZERO, BigDecimal::add);
        
        double averageCorrectRate = weeklyStats.stream()
                .mapToDouble(ws -> ws.getCorrectRate().doubleValue())
                .average()
                .orElse(0.0);

        // 获取最新的效果评估报告
        EffectivenessReport latestReport = effectivenessReportMapper.selectOne(
            new LambdaQueryWrapper<EffectivenessReport>()
                .orderByDesc(EffectivenessReport::getReportDate)
                .last("LIMIT 1")
        );

        overview.put("totalWeight", totalWeight);
        overview.put("averageCorrectRate", averageCorrectRate);
        overview.put("activeUsers", latestReport != null ? latestReport.getActiveUsers() : 0);
        overview.put("reductionRate", latestReport != null ? latestReport.getReductionRate() : 0);

        return overview;
    }

    @Override
    public List<TimeAnalysisVO> getTimeAnalysis(LocalDate startDate, LocalDate endDate) {
        List<DisposalBehavior> behaviors = disposalBehaviorMapper.selectList(
            new LambdaQueryWrapper<DisposalBehavior>()
                .ge(DisposalBehavior::getDisposalTime, startDate.atStartOfDay())
                .le(DisposalBehavior::getDisposalTime, endDate.atTime(23, 59, 59))
        );

        // 按小时统计
        Map<Integer, List<DisposalBehavior>> hourlyGroups = behaviors.stream()
                .collect(Collectors.groupingBy(b -> b.getDisposalTime().getHour()));

        return hourlyGroups.entrySet().stream()
                .map(entry -> {
                    TimeAnalysisVO vo = new TimeAnalysisVO();
                    vo.setHour(entry.getKey());
                    vo.setCount(entry.getValue().size());
                    long correctCount = entry.getValue().stream()
                            .filter(DisposalBehavior::getIsCorrect)
                            .count();
                    vo.setCorrectRate(calculatePercentage(correctCount, entry.getValue().size()));
                    return vo;
                })
                .sorted(Comparator.comparing(TimeAnalysisVO::getHour))
                .collect(Collectors.toList());
    }

    @Override
    public List<RegionAnalysisVO> getRegionAnalysis(LocalDate startDate, LocalDate endDate) {
        List<DisposalBehavior> behaviors = disposalBehaviorMapper.selectList(
            new LambdaQueryWrapper<DisposalBehavior>()
                .ge(DisposalBehavior::getDisposalTime, startDate.atStartOfDay())
                .le(DisposalBehavior::getDisposalTime, endDate.atTime(23, 59, 59))
        );

        // 按区域统计
        Map<String, List<DisposalBehavior>> regionGroups = behaviors.stream()
                .collect(Collectors.groupingBy(DisposalBehavior::getLocation));

        return regionGroups.entrySet().stream()
                .map(entry -> {
                    RegionAnalysisVO vo = new RegionAnalysisVO();
                    vo.setRegion(entry.getKey());
                    vo.setCount(entry.getValue().size());
                    long correctCount = entry.getValue().stream()
                            .filter(DisposalBehavior::getIsCorrect)
                            .count();
                    vo.setCorrectRate(calculatePercentage(correctCount, entry.getValue().size()));
                    
                    // 计算各类型垃圾占比
                    Map<String, Long> typeDistribution = entry.getValue().stream()
                            .collect(Collectors.groupingBy(
                                DisposalBehavior::getWasteType,
                                Collectors.counting()
                            ));
                    vo.setTypeDistribution(typeDistribution);
                    
                    return vo;
                })
                .collect(Collectors.toList());
    }

    @Override
    public byte[] exportAnalysisReport(LocalDate startDate, LocalDate endDate) {
        // 获取各项分析数据
        List<WasteStatisticsVO> statistics = getWasteStatistics(startDate, endDate, null);
        DisposalBehaviorAnalysisVO behaviorAnalysis = getDisposalBehaviorAnalysis(startDate, endDate);
        List<TimeAnalysisVO> timeAnalysis = getTimeAnalysis(startDate, endDate);
        List<RegionAnalysisVO> regionAnalysis = getRegionAnalysis(startDate, endDate);

        // 生成Excel报告
        return ExcelUtils.generateAnalysisReport(
            statistics,
            behaviorAnalysis,
            timeAnalysis,
            regionAnalysis,
            startDate,
            endDate
        );
    }

    private BigDecimal calculatePercentage(long part, long total) {
        if (total == 0) return BigDecimal.ZERO;
        return new BigDecimal(part)
                .multiply(new BigDecimal("100"))
                .divide(new BigDecimal(total), 2, RoundingMode.HALF_UP);
    }

    private BigDecimal calculateReductionRate(LocalDate currentDate) {
        // 获取上周同期数据
        LocalDate lastWeek = currentDate.minusWeeks(1);
        WasteStatistics lastWeekStats = wasteStatisticsMapper.selectOne(
            new LambdaQueryWrapper<WasteStatistics>()
                .eq(WasteStatistics::getCollectionTime, lastWeek)
        );

        WasteStatistics currentStats = wasteStatisticsMapper.selectOne(
            new LambdaQueryWrapper<WasteStatistics>()
                .eq(WasteStatistics::getCollectionTime, currentDate)
        );

        if (lastWeekStats == null || currentStats == null) {
            return BigDecimal.ZERO;
        }

        BigDecimal reduction = lastWeekStats.getWeight().subtract(currentStats.getWeight());
        return reduction.multiply(new BigDecimal("100"))
                .divide(lastWeekStats.getWeight(), 2, RoundingMode.HALF_UP);
    }

    private String analyzeMainProblems(List<DisposalBehavior> behaviors) {
        // 分析错误行为
        Map<String, Long> errorTypes = behaviors.stream()
                .filter(b -> !b.getIsCorrect())
                .collect(Collectors.groupingBy(
                    DisposalBehavior::getErrorType,
                    Collectors.counting()
                ));

        // 找出主要问题
        return errorTypes.entrySet().stream()
                .sorted((e1, e2) -> e2.getValue().compareTo(e1.getValue()))
                .limit(3)
                .map(e -> e.getKey() + "(" + e.getValue() + "次)")
                .collect(Collectors.joining("、"));
    }

    private String generateSuggestions(List<DisposalBehavior> behaviors) {
        List<String> suggestions = new ArrayList<>();

        // 分析错误率
        long totalErrors = behaviors.stream()
                .filter(b -> !b.getIsCorrect())
                .count();
        double errorRate = (double) totalErrors / behaviors.size();

        if (errorRate > 0.3) {
            suggestions.add("建议加强垃圾分类知识的宣传教育");
        }

        // 分析时段分布
        Map<Integer, Long> hourlyDistribution = behaviors.stream()
                .collect(Collectors.groupingBy(
                    b -> b.getDisposalTime().getHour(),
                    Collectors.counting()
                ));

        // 检查是否存在投放高峰期
        hourlyDistribution.entrySet().stream()
                .filter(e -> e.getValue() > behaviors.size() * 0.2)
                .findFirst()
                .ifPresent(e -> suggestions.add(
                    String.format("建议在%d时段增加垃圾收集频次", e.getKey())
                ));

        return String.join("；", suggestions);
    }

    private WasteStatisticsVO convertToWasteStatisticsVO(WasteStatistics statistics) {
        WasteStatisticsVO vo = new WasteStatisticsVO();
        BeanUtils.copyProperties(statistics, vo);
        return vo;
    }

    private DisposalBehaviorVO convertToDisposalBehaviorVO(DisposalBehavior behavior) {
        DisposalBehaviorVO vo = new DisposalBehaviorVO();
        BeanUtils.copyProperties(behavior, vo);
        return vo;
    }

    private EffectivenessReportVO convertToEffectivenessReportVO(EffectivenessReport report) {
        EffectivenessReportVO vo = new EffectivenessReportVO();
        BeanUtils.copyProperties(report, vo);
        return vo;
    }
}

backend\src\main\java\com\campus\waste\service\impl\DisposalManagementServiceImpl.java

package com.campus.waste.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.campus.waste.entity.*;
import com.campus.waste.mapper.*;
import com.campus.waste.model.vo.*;
import com.campus.waste.service.DisposalManagementService;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.beans.BeanUtils;

import java.time.LocalDateTime;
import java.time.LocalDate;
import java.util.List;
import java.util.stream.Collectors;

@Service
public class DisposalManagementServiceImpl implements DisposalManagementService {

    private final SmartBinMapper smartBinMapper;
    private final DisposalRecordMapper disposalRecordMapper;
    private final BinAlertMapper binAlertMapper;
    private final ClassificationStatsMapper classificationStatsMapper;
    private final WasteCategoryMapper wasteCategoryMapper;

    public DisposalManagementServiceImpl(SmartBinMapper smartBinMapper,
                                       DisposalRecordMapper disposalRecordMapper,
                                       BinAlertMapper binAlertMapper,
                                       ClassificationStatsMapper classificationStatsMapper,
                                       WasteCategoryMapper wasteCategoryMapper) {
        this.smartBinMapper = smartBinMapper;
        this.disposalRecordMapper = disposalRecordMapper;
        this.binAlertMapper = binAlertMapper;
        this.classificationStatsMapper = classificationStatsMapper;
        this.wasteCategoryMapper = wasteCategoryMapper;
    }

    @Override
    public List<SmartBinVO> getAllBins() {
        List<SmartBin> bins = smartBinMapper.selectList(null);
        return bins.stream()
                .map(this::convertToSmartBinVO)
                .collect(Collectors.toList());
    }

    @Override
    public SmartBinDetailVO getBinDetail(Long binId) {
        SmartBin bin = smartBinMapper.selectById(binId);
        if (bin == null) {
            throw new RuntimeException("垃圾箱不存在");
        }
        
        SmartBinDetailVO vo = new SmartBinDetailVO();
        BeanUtils.copyProperties(bin, vo);
        
        // 获取分类信息
        WasteCategory category = wasteCategoryMapper.selectById(bin.getCategoryId());
        if (category != null) {
            vo.setCategoryName(category.getCategoryName());
        }
        
        // 计算容量使用率
        vo.setUsageRate((double) bin.getCurrentVolume() / bin.getCapacity() * 100);
        
        return vo;
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void updateBinStatus(Long binId, Integer status) {
        SmartBin bin = new SmartBin();
        bin.setId(binId);
        bin.setStatus(status);
        smartBinMapper.updateById(bin);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void recordDisposal(DisposalRecord record) {
        // 记录投放
        record.setDisposalTime(LocalDateTime.now());
        disposalRecordMapper.insert(record);
        
        // 更新垃圾箱容量
        SmartBin bin = smartBinMapper.selectById(record.getBinId());
        bin.setCurrentVolume(bin.getCurrentVolume() + record.getVolume().intValue());
        smartBinMapper.updateById(bin);
        
        // 更新统计数据
        updateClassificationStats(record);
        
        // 检查是否需要生成预警
        checkAndGenerateAlert(bin);
    }

    @Override
    public IPage<DisposalRecordVO> getDisposalRecords(Long binId, Long userId, Integer pageNum, Integer pageSize) {
        Page<DisposalRecord> page = new Page<>(pageNum, pageSize);
        
        LambdaQueryWrapper<DisposalRecord> wrapper = new LambdaQueryWrapper<>();
        if (binId != null) {
            wrapper.eq(DisposalRecord::getBinId, binId);
        }
        if (userId != null) {
            wrapper.eq(DisposalRecord::getUserId, userId);
        }
        wrapper.orderByDesc(DisposalRecord::getDisposalTime);
        
        IPage<DisposalRecord> recordPage = disposalRecordMapper.selectPage(page, wrapper);
        return recordPage.convert(this::convertToDisposalRecordVO);
    }

    @Override
    public List<BinAlertVO> getUnprocessedAlerts() {
        List<BinAlert> alerts = binAlertMapper.selectList(
            new LambdaQueryWrapper<BinAlert>()
                .eq(BinAlert::getStatus, 0)
                .orderByDesc(BinAlert::getAlertTime)
        );
        
        return alerts.stream()
                .map(this::convertToBinAlertVO)
                .collect(Collectors.toList());
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void processAlert(Long alertId, String processor, String processResult) {
        BinAlert alert = new BinAlert();
        alert.setId(alertId);
        alert.setProcessor(processor);
        alert.setProcessResult(processResult);
        alert.setProcessedTime(LocalDateTime.now());
        alert.setStatus(1);
        binAlertMapper.updateById(alert);
    }

    @Override
    public List<ClassificationStatsVO> getClassificationStats(Long userId, String timeRange) {
        LocalDate startDate = getStartDateFromTimeRange(timeRange);
        
        List<ClassificationStats> statsList = classificationStatsMapper.selectList(
            new LambdaQueryWrapper<ClassificationStats>()
                .eq(userId != null, ClassificationStats::getUserId, userId)
                .ge(ClassificationStats::getStatsDate, startDate)
                .orderByAsc(ClassificationStats::getStatsDate)
        );
        
        return statsList.stream()
                .map(this::convertToClassificationStatsVO)
                .collect(Collectors.toList());
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void checkAndGenerateVolumeAlerts() {
        List<SmartBin> bins = smartBinMapper.selectList(null);
        for (SmartBin bin : bins) {
            checkAndGenerateAlert(bin);
        }
    }

    @Override
    public List<BinMonitoringVO> getBinMonitoringData() {
        List<SmartBin> bins = smartBinMapper.selectList(null);
        return bins.stream()
                .map(this::convertToBinMonitoringVO)
                .collect(Collectors.toList());
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void cleanBin(Long binId) {
        SmartBin bin = new SmartBin();
        bin.setId(binId);
        bin.setCurrentVolume(0);
        bin.setLastCleanedTime(LocalDateTime.now());
        smartBinMapper.updateById(bin);
    }

    @Override
    public List<BinVolumeStatVO> getBinVolumeTrend(Long binId, String timeRange) {
        LocalDateTime startTime = getStartTimeFromTimeRange(timeRange);
        return disposalRecordMapper.getBinVolumeTrend(binId, startTime);
    }

    private void checkAndGenerateAlert(SmartBin bin) {
        // 检查容量预警
        double usageRate = (double) bin.getCurrentVolume() / bin.getCapacity() * 100;
        if (usageRate >= bin.getAlertThreshold()) {
            generateAlert(bin.getId(), 1, String.format("%.2f%%", usageRate));
        }
        
        // 检查电量预警
        if (bin.getBatteryLevel() != null && bin.getBatteryLevel() < 20) {
            generateAlert(bin.getId(), 2, bin.getBatteryLevel().toString());
        }
    }

    private void generateAlert(Long binId, Integer alertType, String alertValue) {
        // 检查是否已存在未处理的同类型预警
        Long count = binAlertMapper.selectCount(
            new LambdaQueryWrapper<BinAlert>()
                .eq(BinAlert::getBinId, binId)
                .eq(BinAlert::getAlertType, alertType)
                .eq(BinAlert::getStatus, 0)
        );
        
        if (count == 0) {
            BinAlert alert = new BinAlert();
            alert.setBinId(binId);
            alert.setAlertType(alertType);
            alert.setAlertValue(alertValue);
            alert.setAlertTime(LocalDateTime.now());
            alert.setStatus(0);
            binAlertMapper.insert(alert);
        }
    }

    private void updateClassificationStats(DisposalRecord record) {
        LocalDate statsDate = record.getDisposalTime().toLocalDate();
        
        ClassificationStats stats = classificationStatsMapper.selectOne(
            new LambdaQueryWrapper<ClassificationStats>()
                .eq(ClassificationStats::getUserId, record.getUserId())
                .eq(ClassificationStats::getCategoryId, record.getWasteTypeId())
                .eq(ClassificationStats::getStatsDate, statsDate)
        );
        
        if (stats == null) {
            stats = new ClassificationStats();
            stats.setUserId(record.getUserId());
            stats.setCategoryId(record.getWasteTypeId());
            stats.setStatsDate(statsDate);
            stats.setTotalCount(1);
            stats.setCorrectCount(record.getIsCorrect());
            classificationStatsMapper.insert(stats);
        } else {
            stats.setTotalCount(stats.getTotalCount() + 1);
            stats.setCorrectCount(stats.getCorrectCount() + record.getIsCorrect());
            classificationStatsMapper.updateById(stats);
        }
    }

    private SmartBinVO convertToSmartBinVO(SmartBin bin) {
        SmartBinVO vo = new SmartBinVO();
        BeanUtils.copyProperties(bin, vo);
        return vo;
    }

    private DisposalRecordVO convertToDisposalRecordVO(DisposalRecord record) {
        DisposalRecordVO vo = new DisposalRecordVO();
        BeanUtils.copyProperties(record, vo);
        return vo;
    }

    private BinAlertVO convertToBinAlertVO(BinAlert alert) {
        BinAlertVO vo = new BinAlertVO();
        BeanUtils.copyProperties(alert, vo);
        return vo;
    }

    private ClassificationStatsVO convertToClassificationStatsVO(ClassificationStats stats) {
        ClassificationStatsVO vo = new ClassificationStatsVO();
        BeanUtils.copyProperties(stats, vo);
        return vo;
    }

    private BinMonitoringVO convertToBinMonitoringVO(SmartBin bin) {
        BinMonitoringVO vo = new BinMonitoringVO();
        BeanUtils.copyProperties(bin, vo);
        vo.setUsageRate((double) bin.getCurrentVolume() / bin.getCapacity() * 100);
        return vo;
    }

    private LocalDate getStartDateFromTimeRange(String timeRange) {
        LocalDate now = LocalDate.now();
        switch (timeRange) {
            case "week":
                return now.minusWeeks(1);
            case "month":
                return now.minusMonths(1);
            case "year":
                return now.minusYears(1);
            default:
                return now.minusDays(7);
        }
    }

    private LocalDateTime getStartTimeFromTimeRange(String timeRange) {
        LocalDateTime now = LocalDateTime.now();
        switch (timeRange) {
            case "day":
                return now.minusDays(1);
            case "week":
                return now.minusWeeks(1);
            case "month":
                return now.minusMonths(1);
            default:
                return now.minusDays(1);
        }
    }
}

backend\src\main\java\com\campus\waste\service\impl\KnowledgeServiceImpl.java

package com.campus.waste.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.campus.waste.entity.KnowledgeArticle;
import com.campus.waste.entity.FAQ;
import com.campus.waste.mapper.KnowledgeArticleMapper;
import com.campus.waste.mapper.FAQMapper;
import com.campus.waste.model.vo.KnowledgeArticleVO;
import com.campus.waste.model.vo.FAQVO;
import com.campus.waste.service.KnowledgeService;
import org.springframework.beans.BeanUtils;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.stream.Collectors;

@Service
public class KnowledgeServiceImpl implements KnowledgeService {

    private final KnowledgeArticleMapper articleMapper;
    private final FAQMapper faqMapper;

    public KnowledgeServiceImpl(KnowledgeArticleMapper articleMapper, FAQMapper faqMapper) {
        this.articleMapper = articleMapper;
        this.faqMapper = faqMapper;
    }

    @Override
    public IPage<KnowledgeArticleVO> getArticleList(Long categoryId, Integer pageNum, Integer pageSize) {
        Page<KnowledgeArticle> page = new Page<>(pageNum, pageSize);
        
        LambdaQueryWrapper<KnowledgeArticle> wrapper = new LambdaQueryWrapper<KnowledgeArticle>()
            .eq(categoryId != null, KnowledgeArticle::getCategoryId, categoryId)
            .eq(KnowledgeArticle::getStatus, 1)
            .orderByDesc(KnowledgeArticle::getCreateTime);
            
        IPage<KnowledgeArticle> articlePage = articleMapper.selectPage(page, wrapper);
        
        return articlePage.convert(this::convertToArticleVO);
    }

    @Override
    public KnowledgeArticleVO getArticleDetail(Long articleId) {
        KnowledgeArticle article = articleMapper.selectById(articleId);
        if (article == null) {
            throw new RuntimeException("文章不存在");
        }
        return convertToArticleVO(article);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void addArticle(KnowledgeArticle article) {
        articleMapper.insert(article);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void updateArticle(KnowledgeArticle article) {
        articleMapper.updateById(article);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void deleteArticle(Long articleId) {
        articleMapper.deleteById(articleId);
    }

    @Override
    public List<FAQVO> getFAQList(Long categoryId) {
        LambdaQueryWrapper<FAQ> wrapper = new LambdaQueryWrapper<FAQ>()
            .eq(categoryId != null, FAQ::getCategoryId, categoryId)
            .orderByAsc(FAQ::getSortOrder);
            
        List<FAQ> faqs = faqMapper.selectList(wrapper);
        
        return faqs.stream()
                .map(this::convertToFAQVO)
                .collect(Collectors.toList());
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void addFAQ(FAQ faq) {
        faqMapper.insert(faq);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void updateFAQ(FAQ faq) {
        faqMapper.updateById(faq);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void deleteFAQ(Long faqId) {
        faqMapper.deleteById(faqId);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void incrementArticleViewCount(Long articleId) {
        articleMapper.incrementViewCount(articleId);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void incrementFAQViewCount(Long faqId) {
        faqMapper.incrementViewCount(faqId);
    }

    private KnowledgeArticleVO convertToArticleVO(KnowledgeArticle article) {
        KnowledgeArticleVO vo = new KnowledgeArticleVO();
        BeanUtils.copyProperties(article, vo);
        return vo;
    }

    private FAQVO convertToFAQVO(FAQ faq) {
        FAQVO vo = new FAQVO();
        BeanUtils.copyProperties(faq, vo);
        return vo;
    }
}

backend\src\main\java\com\campus\waste\service\impl\PointsServiceImpl.java

package com.campus.waste.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.campus.waste.entity.*;
import com.campus.waste.mapper.*;
import com.campus.waste.model.vo.*;
import com.campus.waste.service.PointsService;
import com.campus.waste.service.AchievementService;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.beans.BeanUtils;

import java.time.LocalDateTime;
import java.util.List;
import java.util.stream.Collectors;

@Service
public class PointsServiceImpl implements PointsService {

    private final UserPointsMapper userPointsMapper;
    private final PointsRecordMapper pointsRecordMapper;
    private final PointsProductMapper pointsProductMapper;
    private final PointsExchangeMapper pointsExchangeMapper;
    private final AchievementService achievementService;

    public PointsServiceImpl(UserPointsMapper userPointsMapper,
                           PointsRecordMapper pointsRecordMapper,
                           PointsProductMapper pointsProductMapper,
                           PointsExchangeMapper pointsExchangeMapper,
                           AchievementService achievementService) {
        this.userPointsMapper = userPointsMapper;
        this.pointsRecordMapper = pointsRecordMapper;
        this.pointsProductMapper = pointsProductMapper;
        this.pointsExchangeMapper = pointsExchangeMapper;
        this.achievementService = achievementService;
    }

    @Override
    public UserPointsVO getUserPoints(Long userId) {
        UserPoints userPoints = getUserPointsEntity(userId);
        UserPointsVO vo = new UserPointsVO();
        BeanUtils.copyProperties(userPoints, vo);
        return vo;
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void addPoints(Long userId, Integer points, Integer type, Long sourceId, String sourceType, String description) {
        // 更新用户积分
        UserPoints userPoints = getUserPointsEntity(userId);
        userPoints.setTotalPoints(userPoints.getTotalPoints() + points);
        userPoints.setAvailablePoints(userPoints.getAvailablePoints() + points);
        userPointsMapper.updateById(userPoints);

        // 记录积分变动
        PointsRecord record = new PointsRecord();
        record.setUserId(userId);
        record.setPoints(points);
        record.setType(type);
        record.setSourceId(sourceId);
        record.setSourceType(sourceType);
        record.setDescription(description);
        pointsRecordMapper.insert(record);

        // 检查并更新等级
        checkAndUpdateLevel(userId);

        // 检查并更新成就
        achievementService.checkAndUpdateAchievements(userId, 2, userPoints.getTotalPoints());
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public boolean deductPoints(Long userId, Integer points, Integer type, Long sourceId, String sourceType, String description) {
        UserPoints userPoints = getUserPointsEntity(userId);
        if (userPoints.getAvailablePoints() < points) {
            return false;
        }

        userPoints.setAvailablePoints(userPoints.getAvailablePoints() - points);
        userPointsMapper.updateById(userPoints);

        PointsRecord record = new PointsRecord();
        record.setUserId(userId);
        record.setPoints(-points);
        record.setType(type);
        record.setSourceId(sourceId);
        record.setSourceType(sourceType);
        record.setDescription(description);
        pointsRecordMapper.insert(record);

        return true;
    }

    @Override
    public IPage<PointsRecordVO> getPointsRecords(Long userId, Integer type, Integer pageNum, Integer pageSize) {
        Page<PointsRecord> page = new Page<>(pageNum, pageSize);
        
        LambdaQueryWrapper<PointsRecord> wrapper = new LambdaQueryWrapper<>();
        wrapper.eq(PointsRecord::getUserId, userId)
               .eq(type != null, PointsRecord::getType, type)
               .orderByDesc(PointsRecord::getCreateTime);
        
        IPage<PointsRecord> recordPage = pointsRecordMapper.selectPage(page, wrapper);
        return recordPage.convert(this::convertToPointsRecordVO);
    }

    @Override
    public List<PointsProductVO> getProductList(Boolean includeOffShelf) {
        LambdaQueryWrapper<PointsProduct> wrapper = new LambdaQueryWrapper<>();
        if (!includeOffShelf) {
            wrapper.eq(PointsProduct::getStatus, 1)
                   .ge(PointsProduct::getEndTime, LocalDateTime.now())
                   .le(PointsProduct::getStartTime, LocalDateTime.now());
        }
        wrapper.orderByAsc(PointsProduct::getPoints);
        
        List<PointsProduct> products = pointsProductMapper.selectList(wrapper);
        return products.stream()
                .map(this::convertToPointsProductVO)
                .collect(Collectors.toList());
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void exchangeProduct(Long userId, Long productId, Integer quantity, String receiverName, String receiverPhone, String receiverAddress) {
        // 检查商品
        PointsProduct product = pointsProductMapper.selectById(productId);
        if (product == null || product.getStatus() != 1 || product.getStock() < quantity) {
            throw new RuntimeException("商品不可兑换");
        }

        // 检查兑换限制
        Integer exchangedCount = pointsExchangeMapper.selectCount(
            new LambdaQueryWrapper<PointsExchange>()
                .eq(PointsExchange::getUserId, userId)
                .eq(PointsExchange::getProductId, productId)
        );
        if (exchangedCount + quantity > product.getExchangeLimit()) {
            throw new RuntimeException("超出兑换限制");
        }

        // 扣减积分
        int totalPoints = product.getPoints() * quantity;
        boolean success = deductPoints(userId, totalPoints, 2, productId, "product_exchange", "兑换商品: " + product.getName());
        if (!success) {
            throw new RuntimeException("积分不足");
        }

        // 扣减库存
        product.setStock(product.getStock() - quantity);
        pointsProductMapper.updateById(product);

        // 创建兑换记录
        PointsExchange exchange = new PointsExchange();
        exchange.setUserId(userId);
        exchange.setProductId(productId);
        exchange.setPointsCost(totalPoints);
        exchange.setQuantity(quantity);
        exchange.setStatus(0);
        exchange.setReceiverName(receiverName);
        exchange.setReceiverPhone(receiverPhone);
        exchange.setReceiverAddress(receiverAddress);
        pointsExchangeMapper.insert(exchange);
    }

    @Override
    public IPage<PointsExchangeVO> getExchangeRecords(Long userId, Integer status, Integer pageNum, Integer pageSize) {
        Page<PointsExchange> page = new Page<>(pageNum, pageSize);
        
        LambdaQueryWrapper<PointsExchange> wrapper = new LambdaQueryWrapper<>();
        wrapper.eq(PointsExchange::getUserId, userId)
               .eq(status != null, PointsExchange::getStatus, status)
               .orderByDesc(PointsExchange::getCreateTime);
        
        IPage<PointsExchange> exchangePage = pointsExchangeMapper.selectPage(page, wrapper);
        return exchangePage.convert(this::convertToPointsExchangeVO);
    }

    @Override
    public List<PointsRankingVO> getPointsRanking(String timeRange) {
        return userPointsMapper.getPointsRanking(timeRange);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void updateExchangeStatus(Long exchangeId, Integer status) {
        PointsExchange exchange = new PointsExchange();
        exchange.setId(exchangeId);
        exchange.setStatus(status);
        pointsExchangeMapper.updateById(exchange);
    }

    @Override
    public void checkAndUpdateLevel(Long userId) {
        UserPoints userPoints = getUserPointsEntity(userId);
        int newLevel = calculateLevel(userPoints.getTotalPoints());
        
        if (newLevel != userPoints.getLevel()) {
            userPoints.setLevel(newLevel);
            userPointsMapper.updateById(userPoints);
        }
    }

    private UserPoints getUserPointsEntity(Long userId) {
        UserPoints userPoints = userPointsMapper.selectOne(
            new LambdaQueryWrapper<UserPoints>()
                .eq(UserPoints::getUserId, userId)
        );
        
        if (userPoints == null) {
            userPoints = new UserPoints();
            userPoints.setUserId(userId);
            userPoints.setTotalPoints(0);
            userPoints.setAvailablePoints(0);
            userPoints.setLevel(1);
            userPointsMapper.insert(userPoints);
        }
        
        return userPoints;
    }

    private int calculateLevel(int totalPoints) {
        if (totalPoints < 100) return 1;
        if (totalPoints < 500) return 2;
        if (totalPoints < 2000) return 3;
        if (totalPoints < 5000) return 4;
        if (totalPoints < 10000) return 5;
        return 6;
    }

    private PointsRecordVO convertToPointsRecordVO(PointsRecord record) {
        PointsRecordVO vo = new PointsRecordVO();
        BeanUtils.copyProperties(record, vo);
        return vo;
    }

    private PointsProductVO convertToPointsProductVO(PointsProduct product) {
        PointsProductVO vo = new PointsProductVO();
        BeanUtils.copyProperties(product, vo);
        return vo;
    }

    private PointsExchangeVO convertToPointsExchangeVO(PointsExchange exchange) {
        PointsExchangeVO vo = new PointsExchangeVO();
        BeanUtils.copyProperties(exchange, vo);
        
        // 获取商品信息
        PointsProduct product = pointsProductMapper.selectById(exchange.getProductId());
        if (product != null) {
            vo.setProductName(product.getName());
            vo.setProductImage(product.getImageUrl());
        }
        
        return vo;
    }
}

backend\src\main\java\com\campus\waste\service\impl\UserServiceImpl.java

package com.campus.waste.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.campus.waste.entity.User;
import com.campus.waste.mapper.UserMapper;
import com.campus.waste.model.dto.UserDTO;
import com.campus.waste.model.vo.UserVO;
import com.campus.waste.service.UserService;
import com.campus.waste.exception.BusinessException;
import org.springframework.beans.BeanUtils;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.stream.Collectors;

@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements UserService {

    private final PasswordEncoder passwordEncoder;

    public UserServiceImpl(PasswordEncoder passwordEncoder) {
        this.passwordEncoder = passwordEncoder;
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void register(UserDTO userDTO) {
        // 验证用户名是否已存在
        if (isUsernameExists(userDTO.getUsername())) {
            throw new BusinessException("用户名已存在");
        }

        User user = new User();
        BeanUtils.copyProperties(userDTO, user);
        // 加密密码
        user.setPassword(passwordEncoder.encode(userDTO.getPassword()));
        // 设置默认状态
        user.setStatus(0);
        
        save(user);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void updateUserInfo(UserDTO userDTO) {
        User user = getById(userDTO.getId());
        if (user == null) {
            throw new BusinessException("用户不存在");
        }

        // 如果修改了用户名，需要验证新用户名是否存在
        if (!user.getUsername().equals(userDTO.getUsername()) && isUsernameExists(userDTO.getUsername())) {
            throw new BusinessException("用户名已存在");
        }

        BeanUtils.copyProperties(userDTO, user);
        // 如果密码不为空，则更新密码
        if (userDTO.getPassword() != null && !userDTO.getPassword().isEmpty()) {
            user.setPassword(passwordEncoder.encode(userDTO.getPassword()));
        }
        
        updateById(user);
    }

    @Override
    public UserVO getUserInfo(Long userId) {
        User user = getById(userId);
        if (user == null) {
            throw new BusinessException("用户不存在");
        }
        return convertToVO(user);
    }

    @Override
    public List<UserVO> getUserList(Integer userType) {
        LambdaQueryWrapper<User> wrapper = new LambdaQueryWrapper<>();
        if (userType != null) {
            wrapper.eq(User::getUserType, userType);
        }
        return list(wrapper).stream()
                .map(this::convertToVO)
                .collect(Collectors.toList());
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void updateUserStatus(Long userId, Integer status) {
        User user = getById(userId);
        if (user == null) {
            throw new BusinessException("用户不存在");
        }
        
        User updateUser = new User();
        updateUser.setId(userId);
        updateUser.setStatus(status);
        updateById(updateUser);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void deleteUser(Long userId) {
        User user = getById(userId);
        if (user == null) {
            throw new BusinessException("用户不存在");
        }
        
        // 逻辑删除
        removeById(userId);
    }

    private boolean isUsernameExists(String username) {
        LambdaQueryWrapper<User> wrapper = new LambdaQueryWrapper<>();
        wrapper.eq(User::getUsername, username);
        return count(wrapper) > 0;
    }

    private UserVO convertToVO(User user) {
        UserVO vo = new UserVO();
        BeanUtils.copyProperties(user, vo);
        // 清除敏感信息
        vo.setPassword(null);
        return vo;
    }
}

backend\src\main\java\com\campus\waste\service\impl\WasteClassificationServiceImpl.java

package com.campus.waste.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.campus.waste.entity.WasteCategory;
import com.campus.waste.entity.WasteItem;
import com.campus.waste.mapper.WasteCategoryMapper;
import com.campus.waste.mapper.WasteItemMapper;
import com.campus.waste.model.dto.ImageRecognitionDTO;
import com.campus.waste.model.vo.WasteCategoryVO;
import com.campus.waste.model.vo.WasteItemVO;
import com.campus.waste.service.WasteClassificationService;
import com.campus.waste.service.ImageRecognitionService;
import org.springframework.beans.BeanUtils;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.web.multipart.MultipartFile;

import java.util.List;
import java.util.stream.Collectors;

@Service
public class WasteClassificationServiceImpl implements WasteClassificationService {

    private final WasteCategoryMapper categoryMapper;
    private final WasteItemMapper itemMapper;
    private final ImageRecognitionService imageRecognitionService;

    public WasteClassificationServiceImpl(WasteCategoryMapper categoryMapper,
                                        WasteItemMapper itemMapper,
                                        ImageRecognitionService imageRecognitionService) {
        this.categoryMapper = categoryMapper;
        this.itemMapper = itemMapper;
        this.imageRecognitionService = imageRecognitionService;
    }

    @Override
    public List<WasteCategoryVO> getAllCategories() {
        List<WasteCategory> categories = categoryMapper.selectList(
            new LambdaQueryWrapper<WasteCategory>()
                .orderByAsc(WasteCategory::getSortOrder)
        );
        
        return categories.stream()
                .map(this::convertToCategoryVO)
                .collect(Collectors.toList());
    }

    @Override
    public List<WasteItemVO> getItemsByCategory(Long categoryId) {
        List<WasteItem> items = itemMapper.selectList(
            new LambdaQueryWrapper<WasteItem>()
                .eq(WasteItem::getCategoryId, categoryId)
        );
        
        return items.stream()
                .map(this::convertToItemVO)
                .collect(Collectors.toList());
    }

    @Override
    public List<WasteItemVO> searchItems(String keyword) {
        List<WasteItem> items = itemMapper.selectList(
            new LambdaQueryWrapper<WasteItem>()
                .like(WasteItem::getItemName, keyword)
                .or()
                .like(WasteItem::getKeywords, keyword)
        );
        
        return items.stream()
                .map(this::convertToItemVO)
                .collect(Collectors.toList());
    }

    @Override
    public ImageRecognitionDTO recognizeImage(MultipartFile image, Long userId) {
        return imageRecognitionService.recognizeWaste(image, userId);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void addCategory(WasteCategory category) {
        categoryMapper.insert(category);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void addItem(WasteItem item) {
        itemMapper.insert(item);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void updateCategory(WasteCategory category) {
        categoryMapper.updateById(category);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void updateItem(WasteItem item) {
        itemMapper.updateById(item);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void deleteCategory(Long categoryId) {
        // 检查是否存在关联的物品
        long count = itemMapper.selectCount(
            new LambdaQueryWrapper<WasteItem>()
                .eq(WasteItem::getCategoryId, categoryId)
        );
        
        if (count > 0) {
            throw new RuntimeException("该分类下存在物品，无法删除");
        }
        
        categoryMapper.deleteById(categoryId);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void deleteItem(Long itemId) {
        itemMapper.deleteById(itemId);
    }

    private WasteCategoryVO convertToCategoryVO(WasteCategory category) {
        WasteCategoryVO vo = new WasteCategoryVO();
        BeanUtils.copyProperties(category, vo);
        return vo;
    }

    private WasteItemVO convertToItemVO(WasteItem item) {
        WasteItemVO vo = new WasteItemVO();
        BeanUtils.copyProperties(item, vo);
        
        // 获取分类信息
        WasteCategory category = categoryMapper.selectById(item.getCategoryId());
        if (category != null) {
            vo.setCategoryName(category.getCategoryName());
        }
        
        return vo;
    }
}

backend\src\main\resources\application.yml

server:
  port: 8080
  servlet:
    context-path: /api

spring:
  application:
    name: campus-waste-classification
  
  # 数据库配置
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/campus_waste?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=true&serverTimezone=GMT%2B8
    username: root
    password: 123456
    druid:
      initial-size: 5
      min-idle: 10
      max-active: 20
      
  # Redis配置
  redis:
    host: localhost
    port: 6379
    database: 0
    timeout: 10s
    lettuce:
      pool:
        min-idle: 0
        max-idle: 8
        max-active: 8
        max-wait: -1ms

# MyBatis Plus配置
mybatis-plus:
  mapper-locations: classpath*:/mapper/**/*.xml
  type-aliases-package: com.campus.waste.entity
  configuration:
    map-underscore-to-camel-case: true
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
  global-config:
    db-config:
      logic-delete-field: delFlag
      logic-delete-value: 1
      logic-not-delete-value: 0
      id-type: auto

# JWT配置
jwt:
  secret: campus-waste-classification-secret
  expiration: 604800 # 7天，单位秒
  token-start-with: "Bearer "

backend\src\main\resources\db\data_analysis.sql

-- 垃圾分类数据统计表
CREATE TABLE waste_statistics (
    id BIGINT PRIMARY KEY AUTO_INCREMENT,
    waste_type VARCHAR(50) NOT NULL COMMENT '垃圾类型',
    weight DECIMAL(10,2) NOT NULL COMMENT '重量(kg)',
    count INT NOT NULL COMMENT '数量',
    correct_rate DECIMAL(5,2) NOT NULL COMMENT '正确率(%)',
    collection_time DATE NOT NULL COMMENT '统计日期',
    create_time DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
    update_time DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
) COMMENT '垃圾分类数据统计';

-- 投放行为分析表
CREATE TABLE disposal_behavior (
    id BIGINT PRIMARY KEY AUTO_INCREMENT,
    user_id BIGINT NOT NULL COMMENT '用户ID',
    waste_type VARCHAR(50) NOT NULL COMMENT '垃圾类型',
    disposal_time DATETIME NOT NULL COMMENT '投放时间',
    location VARCHAR(100) NOT NULL COMMENT '投放地点',
    weight DECIMAL(10,2) NOT NULL COMMENT '重量(kg)',
    is_correct TINYINT(1) NOT NULL COMMENT '是否正确分类',
    error_type VARCHAR(50) COMMENT '错误类型',
    create_time DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP
) COMMENT '投放行为分析';

-- 效果评估报告表
CREATE TABLE effectiveness_report (
    id BIGINT PRIMARY KEY AUTO_INCREMENT,
    report_date DATE NOT NULL COMMENT '报告日期',
    total_users INT NOT NULL COMMENT '总用户数',
    active_users INT NOT NULL COMMENT '活跃用户数',
    total_weight DECIMAL(10,2) NOT NULL COMMENT '总重量(kg)',
    correct_rate DECIMAL(5,2) NOT NULL COMMENT '整体正确率(%)',
    reduction_rate DECIMAL(5,2) NOT NULL COMMENT '减少率(%)',
    satisfaction_rate DECIMAL(5,2) NOT NULL COMMENT '满意度(%)',
    main_problems TEXT COMMENT '主要问题',
    suggestions TEXT COMMENT '改进建议',
    create_time DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
    update_time DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
) COMMENT '效果评估报告';

-- 趋势预测表
CREATE TABLE trend_prediction (
    id BIGINT PRIMARY KEY AUTO_INCREMENT,
    prediction_date DATE NOT NULL COMMENT '预测日期',
    waste_type VARCHAR(50) NOT NULL COMMENT '垃圾类型',
    predicted_weight DECIMAL(10,2) NOT NULL COMMENT '预测重量(kg)',
    predicted_count INT NOT NULL COMMENT '预测数量',
    confidence_level DECIMAL(5,2) NOT NULL COMMENT '置信度(%)',
    influencing_factors TEXT COMMENT '影响因素',
    create_time DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
    update_time DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
) COMMENT '趋势预测';

-- 添加索引
CREATE INDEX idx_waste_statistics_date ON waste_statistics(collection_time);
CREATE INDEX idx_disposal_behavior_user ON disposal_behavior(user_id);
CREATE INDEX idx_disposal_behavior_time ON disposal_behavior(disposal_time);
CREATE INDEX idx_effectiveness_report_date ON effectiveness_report(report_date);
CREATE INDEX idx_trend_prediction_date ON trend_prediction(prediction_date);

backend\src\main\resources\db\points_reward.sql

-- 用户积分表
CREATE TABLE IF NOT EXISTS user_points (
    id BIGINT AUTO_INCREMENT COMMENT '主键ID',
    user_id BIGINT NOT NULL COMMENT '用户ID',
    total_points INT NOT NULL DEFAULT 0 COMMENT '总积分',
    available_points INT NOT NULL DEFAULT 0 COMMENT '可用积分',
    level INT NOT NULL DEFAULT 1 COMMENT '用户等级',
    create_time DATETIME DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
    update_time DATETIME DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',
    PRIMARY KEY (id),
    UNIQUE KEY uk_user_id (user_id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='用户积分表';

-- 积分记录表
CREATE TABLE IF NOT EXISTS points_record (
    id BIGINT AUTO_INCREMENT COMMENT '主键ID',
    user_id BIGINT NOT NULL COMMENT '用户ID',
    points INT NOT NULL COMMENT '积分变动值',
    type TINYINT NOT NULL COMMENT '类型(1:投放奖励 2:兑换消费 3:活动奖励)',
    source_id BIGINT COMMENT '来源ID',
    source_type VARCHAR(50) COMMENT '来源类型',
    description VARCHAR(255) COMMENT '描述',
    create_time DATETIME DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
    PRIMARY KEY (id),
    KEY idx_user_id (user_id),
    KEY idx_create_time (create_time)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='积分记录表';

-- 积分商城商品表
CREATE TABLE IF NOT EXISTS points_product (
    id BIGINT AUTO_INCREMENT COMMENT '主键ID',
    name VARCHAR(100) NOT NULL COMMENT '商品名称',
    description TEXT COMMENT '商品描述',
    image_url VARCHAR(255) COMMENT '商品图片',
    points INT NOT NULL COMMENT '所需积分',
    stock INT NOT NULL DEFAULT 0 COMMENT '库存数量',
    total_stock INT NOT NULL DEFAULT 0 COMMENT '总库存',
    exchange_limit INT DEFAULT 1 COMMENT '每人限兑数量',
    status TINYINT DEFAULT 1 COMMENT '状态(0:下架 1:上架)',
    start_time DATETIME COMMENT '开始时间',
    end_time DATETIME COMMENT '结束时间',
    create_time DATETIME DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
    update_time DATETIME DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',
    PRIMARY KEY (id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='积分商城商品表';

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