使用springmvc的MultipartFile实现单文件和多文件上传

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准备工作：需要先搭建一个spirngmvc的maven项目

1、加入jar包

<dependency>      <groupId>commons-fileupload</groupId>      <artifactId>commons-fileupload</artifactId>      <version>1.3</version> </dependency>

2、在springmvc的配置文件中，加入如下配置：

  <!--SpringMVC上传文件时，需要配置MultipartResolver处理器-->    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">        <property name="defaultEncoding" value="UTF-8" />        <!-- 指定所上传文件的总大小不能超过200KB。注意maxUploadSize属性的限制不是针对单个文件，而是所有文件的容量之和 -->        <property name="maxUploadSize" value="200000"/>        <!-- 指定上传文件的临时路径 -->        <!-- <property name="uploadTempDir" value="uploadTempDirectory" /> -->    </bean>

3、创建Controller

package cn.van.controller;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.bind.annotation.ResponseBody;import org.springframework.web.multipart.MultipartFile;import java.io.File;import java.io.IOException;/** * Created by van on 2017-07-18. */@Controller@RequestMapping("/upload")public class MultipartFileController {    //单文件上传    @RequestMapping("/toFileUpload")    public String toUpload(){        return "fileUpload/fileUpload";    }    @RequestMapping("fileUpload")    @ResponseBody    public String upload(MultipartFile multipartFile){        if(!multipartFile.isEmpty()){            //设置文件的保存路径            String filePath = "D:\\MultipartFile\\" + multipartFile.getOriginalFilename();            //转存文件            try {                multipartFile.transferTo(new File(filePath));            } catch (IOException e) {                e.printStackTrace();            }        }        return "success";    }    //多文件上传    @RequestMapping("/toFileUploadFiles")    public String toUploadFiles(){        return "fileUpload/fileUploadFiles";    }    @RequestMapping("fileUploadFiles")    @ResponseBody    //此处用@RequestParam（"xx"）来指定参数名，不加会报错    public String uploadFiles(@RequestParam("multipartFile") MultipartFile[] multipartfiles) throws IOException {        String savePath = "D:\\MultipartFile\\";        if(multipartfiles != null && multipartfiles.length != 0){            if(null != multipartfiles && multipartfiles.length > 0){                //遍历并保存文件                for(MultipartFile file : multipartfiles){                    file.transferTo(new File(savePath + file.getOriginalFilename()));                }            }        }        return "success";    }}

4、写两个简单的上传页面（单文件和多文件）

单文件：

<%@page language="java" contentType="text/html;charset=UTF-8" pageEncoding="UTF-8"%><%@include file="/WEB-INF/jsp/common/common.jsp"%><html><title>test</title><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><head>    <style type="text/css">        .upload {            margin-top: 100px;            margin-left: 100px;            text-align: center;        }    </style></head><body>    <h1 style="text-align: center;margin-top: 20px">test</h1>    <div>        <form class="upload" action="${path}/upload/fileUpload" method="post" enctype="multipart/form-data">            <p>                选择文件:<input type="file" name="multipartFile"/>            </p>            <p></p>            <p style="margin-top: 20px;">                <input style="background-color: #4cbb91;" type="submit" value="上传并检测"/>             </p>        </form>    </div></body></html>

多文件：

<%@page language="java" contentType="text/html;charset=UTF-8" pageEncoding="UTF-8"%><%@include file="/WEB-INF/jsp/common/common.jsp"%><html><title>test</title><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><head>    <style type="text/css">        .upload {            margin-top: 100px;            margin-left: 100px;            text-align: center;        }    </style></head><body>    <h1 style="text-align: center;margin-top: 20px">test</h1>    <div>        <form class="upload" action="${path}/upload/fileUploadFiles" method="post" enctype="multipart/form-data">            <p>                选择文件:<input type="file" name="multipartFile"/>                <input type="file" name="multipartFile"/>                <input type="file" name="multipartFile"/>            </p>            <p></p>            <p style="margin-top: 20px;">                <input style="background-color: #4cbb91;" type="submit" value="上传并检测"/>             </p>        </form>    </div></body></html>

5、访问页面，选择本地文件，上传成功。

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