Springboot+bootstrap界面版之增删改查及图片上传

此博客涉及springboot对jpa的支持,可以参考我博文：https://blog.youkuaiyun.com/water_java/article/details/103808915
目录层级：

详细代码点击：https://github.com/water-java/springboot03_images

导入依赖

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.1.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.hsl</groupId>
    <artifactId>springboot03</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springboot03</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <mysql.version>5.1.44</mysql.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
            <version>${mysql.version}</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!--jpa-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <!--druid-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.10</version>
        </dependency>
        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.3.1</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

用jpa创建表

package com.hsl.springboot03.teacher.entiry;

import lombok.ToString;

import javax.persistence.*;


@Entity
@Table(name = "t_springboot_teacher")
@ToString
public class Teacher {
    @Id
    @GeneratedValue
    private Integer tid;
    @Column(length = 16)
    private String tname;
    @Column(length = 4)
    private String sex;
    @Column(length = 100)
    private String description;
    @Column(length = 200)
    private String imagePath;

    public Integer getTid() {
        return tid;
    }

    public void setTid(Integer tid) {
        this.tid = tid;
    }

    public String getTname() {
        return tname;
    }

    public void setTname(String tname) {
        this.tname = tname;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public String getImagePath() {
        return imagePath;
    }

    public void setImagePath(String imagePath) {
        this.imagePath = imagePath;
    }
}

yml配置

server:
  port: 80
  servlet:
    context-path: /



spring:
  datasource:
    #1.JDBC
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=UTF-8&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC
    username: root
    password: 1234
    druid:
      initial-size: 5
      min-idle: 5
      max-active: 20
      max-wait: 60000
      time-between-eviction-runs-millis: 60000
      min-evictable-idle-time-millis: 30000
      validation-query: SELECT 1 FROM DUAL
      test-while-idle: true
      test-on-borrow: true
      test-on-return: false
      pool-prepared-statements: true
      max-pool-prepared-statement-per-connection-size: 20
      filter:
        stat:
          merge-sql: true
          slow-sql-millis: 5000
      web-stat-filter:
        enabled: true
        url-pattern: /*
        exclusions: "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*"
        session-stat-enable: true
        session-stat-max-count: 100
      stat-view-servlet:
        enabled: true
        url-pattern: /druid/*
        reset-enable: true
        login-username: admin
        login-password: admin
        allow: 127.0.0.1
  jpa:
    hibernate:
#      新加字段时数据库表也添加字段
      ddl-auto: update
    show-sql: true

  thymeleaf:
    cache: false

    # 解决图片上传大小限制问题，也可采取配置类
  servlet:
    multipart:
      max-file-size: 20MB
      max-request-size: 60MB

dao层：TeacherDao

package com.hsl.springboot03.teacher.dao;

import com.hsl.springboot03.teacher.entiry.Teacher;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.JpaSpecificationExecutor;

/**
 * @author water
 * @site www.water.com
 * @company xxx公司
 * @create 2020-01-02 20:02
 * 只要继承JpaRepository，通常所用的增删查改方法都有
 *  第一个参数：操作的实体类
 *  第二个参数：实体类对应数据表的主键
 *
 *  要使用高级查询必须继承
 * org.springframework.data.jpa.repository.JpaSpecificationExecutor<T>接口

 */
public interface TeacherDao extends JpaRepository<Teacher,Integer>, JpaSpecificationExecutor<Teacher> {

}

service层：TeacherService

package com.hsl.springboot03.teacher.service;

import com.hsl.springboot03.teacher.entiry.Teacher;
import com.hsl.springboot03.uitls.PageBean;
import org.springframework.data.domain.Page;

/**
 * @author water
 * @site www.water.com
 * @company xxx公司
 * @create 2020-01-02 20:05
 */
public interface TeacherService {

    public Teacher save(Teacher teacher);

    public void deleteById(Integer id);

    public Teacher findById(Integer id);

    public Page<Teacher> listPager(Teacher teacher, PageBean pageBean);



}

package com.hsl.springboot03.teacher.service.impl;

import com.hsl.springboot03.teacher.dao.TeacherDao;
import com.hsl.springboot03.teacher.entiry.Teacher;
import com.hsl.springboot03.teacher.service.TeacherService;
import com.hsl.springboot03.uitls.PageBean;
import com.hsl.springboot03.uitls.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;
import org.springframework.data.jpa.domain.Specification;
import org.springframework.stereotype.Service;

import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Predicate;
import javax.persistence.criteria.Root;

/**
 * @author water
 * @site www.water.com
 * @company xxx公司
 * @create 2020-01-02 20:09
 */
@Service
public class TeacherServiceImpl implements TeacherService {

    @Autowired
    private TeacherDao teacherDao;
    @Override
    public Teacher save(Teacher teacher) {
        return teacherDao.save(teacher);
    }

    @Override
    public void deleteById(Integer id) {
        teacherDao.deleteById(id);
    }

    @Override
    public Teacher findById(Integer id) {
        return teacherDao.findById(id).get();
    }

    @Override
    public Page<Teacher> listPager(Teacher teacher, PageBean pageBean) {

//        jpa的分页是从0页开始的，所以pageBean.getPage()需要减一
        Pageable pageable= PageRequest.of(pageBean.getPage()-1,pageBean.getRows());

        return teacherDao.findAll(new Specification<Teacher>() {
            @Override
            public Predicate toPredicate(Root<Teacher> root, CriteriaQuery<?> criteriaQuery, CriteriaBuilder criteriaBuilder) {

               Predicate predicate=criteriaBuilder.conjunction();
               if(teacher!=null){
                   if(StringUtils.isNotBlank(teacher.getTname())){
                       predicate.getExpressions().add(criteriaBuilder.like(root.get("tname"),"%"+teacher.getTname()+"%"));
                   }
               }
                return predicate;
            }
        },pageable);

    }
}

controller层：TeacherController

package com.hsl.springboot03.teacher.controller;

import com.hsl.springboot03.teacher.entiry.Teacher;
import com.hsl.springboot03.teacher.service.TeacherService;
import com.hsl.springboot03.uitls.PageBean;
import com.hsl.springboot03.uitls.PageUtil;
import com.hsl.springboot03.uitls.StringUtils;
import org.apache.commons.io.FileUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import java.io.File;

/**
 * @author water
 * @site www.water.com
 * @company xxx公司
 * @create 2020-01-02 20:41
 */
@Controller
@RequestMapping("/teacher")
public class TeacherController {
    @Autowired
    private TeacherService teacherService;

    /**
     * 查看所有
     * @param teacher
     * @param request
     * @return
     */
    @RequestMapping("/listPager")
    public ModelAndView list(Teacher teacher, HttpServletRequest request) {
        ModelAndView modelAndView = new ModelAndView();
        PageBean pageBean = new PageBean();
        pageBean.setRequest(request);
        Page<Teacher> teachers = teacherService.listPager(teacher, pageBean);
        modelAndView.addObject("teachers", teachers.getContent());
        pageBean.setTotal(teachers.getTotalElements() + "");
        modelAndView.addObject("pageCode", PageUtil.createPageCode(pageBean));
        modelAndView.setViewName("list");
        return modelAndView;
    }

    /**
     * 修改
     * @param teacher
     * @return
     */
    @RequestMapping("/toEdit")
    public ModelAndView toEdit(Teacher teacher){
    ModelAndView modelAndView=new ModelAndView();
    modelAndView.setViewName("edit");
    modelAndView.addObject("sexArr",new String[]{"男","女"});
    if(!(teacher.getTid()==null||"".equals(teacher.getTid()))){
        Teacher t=teacherService.findById(teacher.getTid());
        modelAndView.addObject("teacher",t);
    }
    return modelAndView;
    }

    /**
     * 添加
     * @param teacher
     * @param image
     * @return
     */
    @RequestMapping("/add")
    public String add(Teacher teacher, MultipartFile image){
        try {
            String diskPath="E://img/"+image.getOriginalFilename();
            String serverPath="/uploadImages/"+image.getOriginalFilename();
            if(StringUtils.isNotBlank(image.getOriginalFilename())){
                FileUtils.copyInputStreamToFile(image.getInputStream(),new File(diskPath));
            teacher.setImagePath(serverPath);
            }

            teacherService.save(teacher);
        }catch (Exception e){
            e.printStackTrace();
        }
        return "redirect:/teacher/listPager";
    }

    /**
     * 修改
     * @param teacher
     * @param image
     * @return
     */
    @RequestMapping("/edit")
    public String edit(Teacher teacher, MultipartFile image){
        try {
            String diskPath="E://img/"+image.getOriginalFilename();
            String serverPath="/uploadImages/"+image.getOriginalFilename();
            if(StringUtils.isNotBlank(image.getOriginalFilename())){
                FileUtils.copyInputStreamToFile(image.getInputStream(),new File(diskPath));
                teacher.setImagePath(serverPath);
            }

            teacherService.save(teacher);
        }catch (Exception e){
            e.printStackTrace();
        }
        return "redirect:/teacher/listPager";
    }

    /**
     * 删除
     * @param bid
     * @return
     */
    @RequestMapping("/del/{bid}")
    public String del(@PathVariable(value = "bid") Integer bid){
        teacherService.deleteById(bid);
        return "redirect:/teacher/listPager";
    }
}

测试效果：

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