@RequestMapping("/upload/fileImprove")
  public String improveFileUpload(HttpServletRequest request, HttpServletResponse response)
      throws IllegalStateException, IOException {
    CommonsMultipartResolver multipartResolver =
        new CommonsMultipartResolver(request.getSession().getServletContext());
    if (multipartResolver.isMultipart(request)) {
      MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request;

      Iterator it = multiRequest.getFileNames();
      while (it.hasNext()) {
        MultipartFile file = multiRequest.getFile((String) it.next());

        if (file != null) {
          String fileName = "demoUpload" + file.getOriginalFilename();
          String path = "D:\\" + fileName;
          File local = new File(path);
          file.transferTo(local);
        }
      }
    }
    return "success";
  }
 @RequestMapping("/testFileUploadDuo")
 public String upload2(HttpServletRequest request, HttpServletResponse response)
     throws IllegalStateException, IOException {
   // 创建一个通用的多部分解析器
   CommonsMultipartResolver multipartResolver =
       new CommonsMultipartResolver(request.getSession().getServletContext());
   // 判断 request 是否有文件上传,即多部分请求
   if (multipartResolver.isMultipart(request)) {
     // 转换成多部分request
     MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request;
     // 取得request中的所有文件名
     Iterator<String> iter = multiRequest.getFileNames();
     while (iter.hasNext()) {
       // 记录上传过程起始时的时间,用来计算上传时间
       int pre = (int) System.currentTimeMillis();
       // 取得上传文件
       MultipartFile file = multiRequest.getFile(iter.next());
       if (file != null) {
         // 取得当前上传文件的文件名称
         String myFileName = file.getOriginalFilename();
         // 如果名称不为“”,说明该文件存在,否则说明该文件不存在
         if (myFileName.trim() != "") {
           System.out.println("myFileName" + myFileName);
           // 重命名上传后的文件名
           String fileName = "demoUpload/" + file.getOriginalFilename();
           // 定义上传路径
           String path = "E:/" + fileName;
           System.out.println("path=" + path);
           File localFile = new File(path);
           file.transferTo(localFile);
         }
       }
       // 记录上传该文件后的时间
       int finaltime = (int) System.currentTimeMillis();
       System.out.println(finaltime - pre);
     }
   }
   return "/success";
 }