code: public UploadFile getUploadFile(HttpServletRequest request, String id) {
      UploadFile uploadFile = null;
      Debug.logVerbose("[JdonFramework]--> getUploadFile session filter id=" + id, module);
      try {
        uploadFile = getUploadFileFromSession(request, id);
        if (uploadFile == null) {
          uploadFile = imageFilter.getUploadFile(request, id);
        }
      } catch (Exception ex) {
        Debug.logWarning(" getUploadFile error" + ex, module);
  
      }
      return uploadFile;
    }
docs: 根据UploadFile的id获得UploadFile实例
  @param request
  @param id
  @return