code: public Collection getUploadFileID(HttpServletRequest request) {
      Debug.logVerbose("[JdonFramework]--> enter cache filter ", module);
      Collection uploadIDList = null;
      try {
        uploadIDList = imageFilter.getUploadFileID(request);
      } catch (Exception ex) {
        Debug.logError("[JdonFramework] not found the upload files in session", module);
      }
      return uploadIDList;
  
    }
docs: ID集合暂时不做缓存
  @param request
  @return