<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">

    <!-- 上传文件大小上限，单位为字节（10MB） -->

    <property name="maxUploadSize">

          <value>10485760</value>

    </property>

    <!-- 请求的编码格式，必须和jSP的pageEncoding属性一致，以便正确读取表单的内容，默认为ISO-8859-1 -->

    <property name="defaultEncoding">

          <value>UTF-8</value>

    </property>
</bean>

<dependency>

     <groupId>commons-fileupload</groupId>

     <artifactId>commons-fileupload</artifactId>

     <version>1.3.1</version>

</dependency>

 <dependency>

     <groupId>commons-io</groupId>

     <artifactId>commons-io</artifactId>

     <version>2.4</version>

</dependency>

<form action="${pageContext.request.contextPath}/upload/uploadFile" method="post" enctype="multipart/form-data">

    <input type="file" name="imgFile"/>

    <input type="submit" value="提交">

</form>

@RequestMapping(value="uploadFile")

public String uploadFile(MultipartFile imgFile, HttpSession session) throws IllegalStateException, IOException{

   　if(imgFile.getSize()==0){
　　　　 //没有上传文件
　　　　　return error; 
　　 } 
　　 //获取文件名称: temp.jpg

     String oFilename = imgFile.getOriginalFilename();
　　　String path = session.getServletContext().getRealPath("/productImages"); //上传文件保存目录

     //设置随机名称,防止文件名称重名

     String uuidFilename = UUID.randomUUID().toString().replace("-", "") + oFilename.substring(oFilename.lastIndexOf("."));

     imgFile.transferTo(new File(path, uuidFilename));

     return "success";

}

<form action="${pageContext.request.contextPath}/upload/uploadFiles" method="post" enctype="multipart/form-data">

    <input type="file" name="imgFiles"/>

    <input type="file" name="imgFiles"/>

    <input type="file" name="imgFiles"/>

    <input type="submit" value="提交">

</form>

import java.util.List;

import org.springframework.web.multipart.MultipartFile;

public class UploadVo {

    private List<MultipartFile> imgFiles;

    public List<MultipartFile> getImgFiles() {

        return imgFiles;

    }

    public void setImgFiles(List<MultipartFile> imgFiles) {

        this.imgFiles = imgFiles;

    }

}

@RequestMapping(value="uploadFiles")

public String uploadFiles(UploadVo vo) throws IllegalStateException, IOException{

     //获取上传图片文件集合

     List<MultipartFile> imgFiles = vo.getImgFiles();

     for (MultipartFile multipartFile : imgFiles) {

         if(multipartFile.getSize() <= 0 ){//文件大小为0,跳过

             continue;

         }

         //获取文件名称

         String filename = multipartFile.getOriginalFilename();

         //生成随机文件名

         String uuidFilename = UUID.randomUUID().toString().replace("-", "")+filename.substring(filename.lastIndexOf("."));

         //将文件写入磁盘中

         multipartFile.transferTo(new File("d:/" + uuidFilename));

     }

     return "test";

}

<a href="${pageContext.request.contextPath}/upload/download?filename=文件12.jpg">下载文件</a>

//下载文件

@RequestMapping(value="/download")

public ResponseEntity<byte[]> download(@RequestParam("filename") String filename) throws IOException{

    //下载显示的文件名，解决中文名称乱码问题

    String downloadFilename = new String(filename.getBytes("iso8859-1"), "utf-8");

    //创建文件

    File file = new File("d:/", downloadFilename);

     if(!file.exists()){

          //文件不存在

         return null;

     }

    //创建请求头

    HttpHeaders headers = new HttpHeaders();

    //通知浏览器以attachment（下载方式）打开图片

     headers.setContentDispositionFormData("attachment", filename);

     //application/octet-stream ： 二进制流数据（最常见的文件下载）

     headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);

     //返回ResponseEntity<byte[]>

     return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file), headers, HttpStatus.CREATED);

}