spring mvc CommonsMultipartResolver 文件上传监听。

/**       * 重写 parseRequest方法 监听       */      @Override      protected MultipartParsingResult parseRequest(HttpServletRequest request)        throws MultipartException {       System.out.println("MultipartParsingResult:--------------------------"+request);       String encoding = determineEncoding(request);       FileUpload fileUpload = prepareFileUpload(encoding);       fileUpload.setFileSizeMax(-1);        final HttpSession session = request.getSession();        fileUpload.setProgressListener(new ProgressListener() {         @Override         public void update(long pBytesRead, long pContentLength,           int pItems) {          try {           Thread.sleep(5);          } catch (InterruptedException e) {           e.printStackTrace();          }          session.setAttribute("pBytesRead", pBytesRead);         }        });       try {        List<FileItem> fileItems = ((ServletFileUpload) fileUpload).parseRequest(request);        return parseFileItems(fileItems, encoding);       } catch (FileUploadBase.SizeLimitExceededException ex) {        throw new MaxUploadSizeExceededException(fileUpload.getSizeMax(),          ex);       } catch (FileUploadException ex) {        throw new MultipartException(          "Could not parse multipart servlet request", ex);       }      }