spring的上传、下载功能

@RequestMapping(value = "/download/{apk}", method = RequestMethod.GET)
 download(Config.getString("sys#apkpath") + apk + ".apk", response);
 }

 public HttpServletResponse download(String path, HttpServletResponse response) {
  try {
   // path是指欲下载的文件的路径。
   File file = new File(path);
   // 取得文件名。
   String filename = file.getName();
   // 取得文件的后缀名。
   String ext = filename.substring(filename.lastIndexOf(".") + 1).toUpperCase();
   // 以流的形式下载文件。
   InputStream fis = new BufferedInputStream(new FileInputStream(path));
   byte[] buffer = new byte[fis.available()];
   fis.read(buffer);
   fis.close();
   // 清空response
   response.reset();
   // 设置response的Header
   response.addHeader("Content-Disposition", "attachment;filename=" + new String(filename.getBytes()));
   response.addHeader("Content-Length", "" + file.length());
   OutputStream toClient = new BufferedOutputStream(response.getOutputStream());
   response.setContentType("application/octet-stream");
   toClient.write(buffer);
   toClient.flush();
   toClient.close();
  } catch (IOException ex) {
   ex.printStackTrace();
  }
  return response;
 }



 try {
   String fileName=null;
   Product product=productService.getOneProduct(pid);
   product.setDownloadTime(product.getDownloadTime()+1);
   productService.update(product);
   try {
    fileName = ServletRequestUtils.getRequiredStringParameter(request, "fileName");
   } catch (ServletRequestBindingException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
   //InputStream file = new FileInputStream(Config.getRealPath("/apk/") + fileName);
   File file=new File(Config.getRealPath("/apk")+"/"+fileName);
   FileInputStream f=new FileInputStream(file);
    response.setContentType("apk");
    response.setContentLength(f.available());//以字节为单位
   response.setHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\"");

   FileCopyUtils.copy(f, response.getOutputStream());
  } catch (IOException e) {
   e.printStackTrace();
  }

上传功能

MultipartHttpServletRequest multipartrequest = (MultipartHttpServletRequest) request;
			Iterator<String> iterator = multipartrequest.getFileNames();
					while (iterator.hasNext()) {
				String fileName = (String) iterator.next();
				MultipartFile file = multipartrequest.getFile(fileName);
				String ext = CommonTool.getType(file.getOriginalFilename());//中间的file.getOriginalFilename()为你上传的文件名
				if (ext.equalsIgnoreCase("apk")) {
					FileCopyUtils.copy(file.getBytes(), new File(Config.getRealPath("/apk") + "/" + 保存的文件名);