SprrgBoot实现文件上传

最新推荐文章于 2022-08-05 14:28:36 发布

原创最新推荐文章于 2022-08-05 14:28:36 发布 · 235 阅读

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博客介绍了单个文件上传的代码实现，包括导包、启动类，还涉及 application.properties 和 application.yml 配置文件，以及 Controller 层和页面代码，最终完成了单个文件上传。

1.导包

    <name>SpringWebContent Maven Webapp</name>
    <url>http://maven.apache.org</url>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.4.3.RELEASE</version>
    </parent>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.1.1</version>
        </dependency>
        <!-- 引入Druid依赖 -->
        <!-- Druid数据库连接池组件 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.8</version>
        </dependency>
        <!--2333333233333333333333333333333333333333333333-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.1.1</version>
        </dependency>
      <!-- mybatis-plus begin -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatisplus-spring-boot-starter</artifactId>
            <version>${mybatisplus-spring-boot-starter.version}</version>
        </dependency>
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus</artifactId>
            <version>${mybatisplus.version}</version>
        </dependency>
        <!--代码自动生成支持-->
        <dependency>
            <groupId>org.apache.velocity</groupId>
            <artifactId>velocity</artifactId>
            <version>1.7</version>
        </dependency>
        <!-- mybatis-plus end -->
        <!-- 引入freeMarker的依赖包. -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-freemarker</artifactId>
        </dependency>
        <!-- 静态资源.无所谓 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <!-- 引入Druid依赖 -->
        <!-- Druid数据库连接池组件 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.8</version>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.16</version>
            <scope>compile</scope>
        </dependency>
    </dependencies>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <build>
        <finalName>SpringWebContent</finalName>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

2.启动类

package com.file;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;
import org.springframework.context.annotation.ComponentScan;

@SpringBootApplication
//@EnableAutoConfiguration
@MapperScan("com.file.mapper") // mybatis扫描路径，针对的是接口Mapper类//必须加这个，不加报错，如果不加，也可以在每个mapper上添加@Mapper注释，
//配置druid必须加的注解，如果不加，访问页面打不开，filter和servlet、listener之类的需要单独进行注册才能使用
// spring boot里面提供了该注解起到注册作用
//@ServletComponentScan(value = "com.my.config")
public class Application {
    public static void main(String[] args) {
        System.err.println("SpringBoot启动中....");
        SpringApplication.run(Application.class, args);
        System.err.println("SpringBoot启动成功....");
    }
}

3.配置文件(application.properties)

server.port=8081

server.servlet.context-path=/feng
#logging.config=classpath:config/log4j.properties
#静态资源默认扫描资源包下的static文件夹 例如 要引入某js <script src="${base}/js/jquery.min.js"></script>
#直接引入的就是static/js/....js

#MYSQ 相关配置
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/yuezi?useUnicode=true&amp;characterEncoding=UTF-8
spring.datasource.username=root
spring.datasource.password=123456

###################以下为druid增加的配置###########################
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
# 下面为连接池的补充设置，应用到上面所有数据源中
# 初始化大小，最小，最大
spring.datasource.initialSize=5
spring.datasource.minIdle=5
spring.datasource.maxActive=20
# 配置获取连接等待超时的时间
spring.datasource.maxWait=60000
# 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒
spring.datasource.timeBetweenEvictionRunsMillis=60000
# 配置一个连接在池中最小生存的时间，单位是毫秒
spring.datasource.minEvictableIdleTimeMillis=300000
spring.datasource.validationQuery=SELECT 1 FROM DUAL
spring.datasource.testWhileIdle=true
spring.datasource.testOnBorrow=false
spring.datasource.testOnReturn=false
# 打开PSCache，并且指定每个连接上PSCache的大小
spring.datasource.poolPreparedStatements=true
spring.datasource.maxPoolPreparedStatementPerConnectionSize=20
# 配置监控统计拦截的filters，去掉后监控界面sql无法统计，'wall'用于防火墙
spring.datasource.filters=stat,wall,log4j
# 通过connectProperties属性来打开mergeSql功能；慢SQL记录
spring.datasource.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
# 合并多个DruidDataSource的监控数据
#spring.datasource.useGlobalDataSourceStat=true
###############以上为配置druid添加的配置########################################



spring.freemarker.settings.number_format=0.##
spring.freemarker.allow-request-override=false
spring.freemarker.allow-session-override=false
spring.freemarker.cache=false
spring.freemarker.charset=UTF-8
spring.freemarker.check-template-location=true
spring.freemarker.content-type=text/html
spring.freemarker.enabled=true
spring.freemarker.expose-request-attributes=false
spring.freemarker.expose-session-attributes=false
spring.freemarker.expose-spring-macro-helpers=true
spring.freemarker.prefer-file-system-access=true
spring.freemarker.suffix=.ftl
spring.freemarker.template-loader-path=classpath:/templates/
spring.freemarker.settings.template_update_delay=0
spring.freemarker.settings.default_encoding=UTF-8
spring.freemarker.settings.classic_compatible=true
spring.freemarker.settings.date_format=yyyy-MM-dd
spring.freemarker.settings.time_format=HH:mm:ss
spring.freemarker.settings.datetime_format=yyyy-MM-dd HH:mm:ss
spring.freemarker.order=1
spring.freemarker.request-context-attribute=request

spring.servlet.multipart.max-file-size = 10Mb
spring.http.multipart.max-request-size=100Mb
#mybatis plus
mybatis-plus.mapper-locations=classpath:/mapper/*Mapper.xml
mybatis-plus.typeAliasesPackage=com.file.bean
mybatis-plus.global-config.id-type=2
mybatis-plus.global-config.refresh-mapper: true

4.配置文件(application.yml)

mybatis-plus:
  # 如果是放在src/main/java目录下 classpath:/com/yourpackage/*/mapper/*Mapper.xml
  # 如果是放在resource目录 classpath:/mapper/*Mapper.xml
  mapper-locations: classpath:/mapper/*Mapper.xml
  #实体扫描，多个package用逗号或者分号分隔
  typeAliasesPackage: com.file.bean
  global-config:
    #主键类型  0:"数据库ID自增", 1:"用户输入ID",2:"全局唯一ID (数字类型唯一ID)", 3:"全局唯一ID UUID";
    id-type: 2
    #字段策略 0:"忽略判断",1:"非 NULL 判断"),2:"非空判断"
    field-strategy: 2
    #驼峰下划线转换
    db-column-underline: true
    #mp2.3+ 全局表前缀 mp_
    #table-prefix: mp_
    #刷新mapper 调试神器
    refresh-mapper: true
    #数据库大写下划线转换
    capital-mode: false
  configuration:
    #配置返回数据库(column下划线命名&&返回java实体是驼峰命名)，自动匹配无需as（没开启这个，SQL需要写as： select user_id as userId）
    map-underscore-to-camel-case: true
    cache-enabled: false
    #配置JdbcTypeForNull, oracle数据库必须配置
    jdbc-type-for-null: 'null'

5.Controller层

//返回页面
@RequestMapping("/index")
public String index(){
    return "index";
}

//文件上传相关代码
@RequestMapping(value = "upload")
@ResponseBody
public String upload(@RequestParam("test") MultipartFile file) {
    if (file.isEmpty()) {
        return "文件为空";
    }
    // 获取文件名
    String fileName = file.getOriginalFilename();
    System.out.println("上传的文件名为：" + fileName);
    // 获取文件的后缀名
    String suffixName = fileName.substring(fileName.lastIndexOf("."));
    System.out.println("上传的后缀名为：" + suffixName);
    // 文件上传后的路径
    String filePath = "F://";
    // 解决中文问题，liunx下中文路径，图片显示问题
    // fileName = UUID.randomUUID() + suffixName;
    File dest = new File(filePath + fileName);
    // 检测是否存在目录
    if (!dest.getParentFile().exists()) {
        dest.getParentFile().mkdirs();
    }
    try {
        file.transferTo(dest);
        return "上传成功";
    } catch (IllegalStateException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return "上传失败";
}

7.页面代码

<h1>文件上传</h1>

<form action="/uploadFile/upload" method="POST" enctype="multipart/form-data">
    <p>文件：<input type="file" name="test"/></p>
    <p><input type="submit" value="上传单文件"/></p>
</form>

单个文件上传完成了