public String importUser() throws Exception {
   List<User> list = excelHelperService.excelToUser(excelFile);
   for (User u : list) {
     userService.add(u);
   }
   setJsonMessage(true, "员工导入成功");
   return render(jo.toString());
 }
 // 添加一个导出用户信息excel表格的方法
 public String exportUserRole() throws Exception {
   String fileName = "考勤系统用户报表";
   query = p("queryName");
   queryMap.put("roleId", p("roleType"));
   ListData<User> listData = userService.getListData(query, queryMap, 0, 0);
   File file = excelHelperService.exportUserRoleExcel(fileName, listData.getList());
   byte[] bytes = FileUtils.readFileToByteArray(file);
   return renderFile(bytes, fileName + ".xls");
 }