code: public Collection getAllUploadFile(HttpServletRequest request) {
  
      Collection uploadList = null;
      try {
        HttpSession session = request.getSession();
        if (session != null) {
          uploadList = (Collection) session.getAttribute(PIC_NAME_PACKAGE);
        }
      } catch (Exception ex) {
        Debug.logError("[JdonFramework] not found the upload files in session" + ex, module);
      }
      return uploadList;
    }
docs: 取出保存的所有UploadFile集合，但不从Session删除这些集合
  @param request
  @return