@RequestMapping("/load/config")
 @ResponseBody
 public ExtData load(
     @RequestParam(value = "page", required = false, defaultValue = "1") Integer currentPage,
     @RequestParam(required = false, value = "limit", defaultValue = "10") Integer pageSize,
     HttpServletRequest request) {
   Page<SystemConfigEntity> datas =
       systemConfigDao.findAll(new ExtPageRequest(currentPage, pageSize));
   return new ExtGridData(true, datas.getTotalElements(), datas.getContent());
 }