Spring MVC

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="" 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="" 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。