基于Spring3 MVC实现基于HTML form表单文件上传

@RequestMapping(value = "/uploadFile", method = RequestMethod.POST)
public ModelAndView getUploadFile(HttpServletRequest request, HttpServletResponse response) {
  System.out.println("fucking spring3 MVC upload file with Multipart form");
  String myappPath = request.getSession().getServletContext().getRealPath("/");
  try {
    if (request instanceof MultipartHttpServletRequest) {
      MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
      System.out.println("fucking spring3 MVC upload file with Multipart form");
      // String myappPath = multipartRequest.getServletContext().getRealPath("/"); 
      // does not work, oh my god!!
      MultipartFile file = multipartRequest.getFiles("userfile1").get(0);
      long size = file.getSize();
      byte[] data = new byte[(int) size];
      InputStream input = file.getInputStream();
      input.read(data);
      
      // create file, if no app context path, will throws access denied.
      // seems like you could not create any file at tomcat/bin directory!!!
      File outFile = new File(myappPath + File.separator + file.getOriginalFilename());
      if(!outFile.exists()) {
        outFile.createNewFile();
        System.out.println("full path = " + outFile.getAbsolutePath());
      } else {
        System.out.println("full path = " + outFile.getAbsolutePath());
      }
      FileOutputStream outStream = new FileOutputStream(outFile);
      
      outStream.write(data);
      outStream.close();
      input.close();
    }
  } catch (Exception e) {
    e.printStackTrace();
  }
 
  return new ModelAndView("welcome");
}