Spring Boot文件上传最新解决方案_Java教程

一、创建一个简单的包含WEB依赖的SpringBoot项目

pom.xml内容：

									<!-- Spring Boot web启动器 -->

									<dependency>

									    <groupId>org.springframework.boot</groupId>

									    <artifactId>spring-boot-starter-web</artifactId>

									</dependency>

									<!-- jsp -->

									<dependency>

									    <groupId>javax.servlet</groupId>

									    <artifactId>jstl</artifactId>

									</dependency>

									<dependency>

									    <groupId>org.apache.tomcat.embed</groupId>

									    <artifactId>tomcat-embed-jasper</artifactId>

									    <!--<scope>provided</scope>-->

									</dependency>

二、配置文件上传的文件大小限制

application.properties配置文件添加：

				?

									# 上传文件总的最大值

									spring.servlet.multipart.max-request-size=10MB

									# 单个文件的最大值

									spring.servlet.multipart.max-file-size=10MB

									## jsp

									spring.mvc.view.prefix=/WEB-INF/jsp/

									spring.mvc.view.suffix=.jsp

spring.servlet.multipart.max-file-size限制单个文件的最大值
spring.servlet.multipart.max-request-size限制上传的多个文件的总大小

三、单文件上传示例

1、创建Controller控制类，内容如下：

				?

									package com.songguoliang.springboot.controller;

									import org.slf4j.Logger;

									import org.slf4j.LoggerFactory;

									import org.springframework.stereotype.Controller;

									import org.springframework.web.bind.annotation.GetMapping;

									import org.springframework.web.bind.annotation.PostMapping;

									import org.springframework.web.bind.annotation.RequestParam;

									import org.springframework.web.bind.annotation.ResponseBody;

									import org.springframework.web.multipart.MultipartFile;

									import org.springframework.web.multipart.MultipartHttpServletRequest;

									import javax.servlet.http.HttpServletRequest;

									import java.io.File;

									import java.io.IOException;

									import java.util.List;

									/**

									 * @Description

									 * @Author sgl

									 * @Date 2018-05-15 14:04

									 */

									@Controller

									public class UploadController {

									    private static final Logger LOGGER = LoggerFactory.getLogger(UploadController.class);

									    @GetMapping("/upload")

									    public String upload() {

									        return "upload";

									    }

									    @PostMapping("/upload")

									    @ResponseBody

									    public String upload(@RequestParam("file") MultipartFile file) {

									        if (file.isEmpty()) {

									            return "上传失败，请选择文件";

									        }

									        String fileName = file.getOriginalFilename();

									        String filePath = "/Users/itinypocket/workspace/temp/";

									        File dest = new File(filePath + fileName);

									        try {

									            file.transferTo(dest);

									            LOGGER.info("上传成功");

									            return "上传成功";

									        } catch (IOException e) {

									            LOGGER.error(e.toString(), e);

									        }

									        return "上传失败！";

									    }

									}

2、创建upload.jsp文件

只有一个表单，选择文件，form的enctype为multipart/form-data:

				?

									<%@ page contentType="text/html;charset=UTF-8" pageEncoding="UTF-8" %>

									<!DOCTYPE html>

									<html>

									<head>

									    <meta http-equiv="Content-type" content="text/html; charset=UTF-8">

									    <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"/>

									    <title>单文件上传</title>

									</head>

									<body>

									<form method="post" action="/upload" enctype="multipart/form-data">

									    <input type="file" name="file"><br>

									    <input type="submit" value="提交">

									</form>

									</body>

									</html>

3、通过springboot插件启动项目，浏览器输入http://localhost:8080/upload：

Spring Boot文件上传最新解决方案

选择文件点击提交按钮返回成功信息，我们上传的文件保存在/Users/itinypocket/workspace/temp路径下：

Spring Boot文件上传最新解决方案

四、多文件上传

1、创建多文件上传的jsp页面，多文件上传页面只是比单文件上传多了file选择的input而已，multiUpload.jsp内容如下：

				?

									<%@ page contentType="text/html;charset=UTF-8" pageEncoding="UTF-8" %>

									<!DOCTYPE html>

									<html>

									<head>

									    <meta http-equiv="Content-type" content="text/html; charset=UTF-8">

									    <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"/>

									    <title>多文件上传</title>

									</head>

									<body>

									<form method="post" action="/multiUpload" enctype="multipart/form-data">

									    <input type="file" name="file"><br>

									    <input type="file" name="file"><br>

									    <input type="file" name="file"><br>

									    <input type="submit" value="提交">

									</form>

									</body>

									</html>

2、在UploadController里添加多文件上传的方法

				?

									@GetMapping("/multiUpload")

									public String multiUpload() {

									    return "multiUpload";

									}

									@PostMapping("/multiUpload")

									@ResponseBody

									public String multiUpload(HttpServletRequest request) {

									    List<MultipartFile> files = ((MultipartHttpServletRequest) request).getFiles("file");

									    String filePath = "/Users/itinypocket/workspace/temp/";

									    for (int i = 0; i < files.size(); i++) {

									        MultipartFile file = files.get(i);

									        if (file.isEmpty()) {

									            return "上传第" + (i++) + "个文件失败";

									        }

									        String fileName = file.getOriginalFilename();

									        File dest = new File(filePath + fileName);

									        try {

									            file.transferTo(dest);

									            LOGGER.info("第" + (i + 1) + "个文件上传成功");

									        } catch (IOException e) {

									            LOGGER.error(e.toString(), e);

									            return "上传第" + (i++) + "个文件失败";

									        }

									    }

									    return "上传成功";

									}