docs: @ResponseBody
      @RequestMapping(value = "/filetext/{configId}", method = RequestMethod.PUT)
      public JsonObjectBase updateFileWithText(@PathVariable long configId, @NotNull String fileContent) {
  
          //
          // 更新
          //
          String emailNotification = "";
          try {
  
              String str = new String(fileContent.getBytes(), "UTF-8");
              LOG.info("receive file: " + str);
  
              emailNotification = configMgr.updateItemValue(configId, str);
              LOG.info("update " + configId + " ok");
  
          } catch (Exception e) {
  
              throw new FileUploadException("upload.file.error", e);
          }
  
          //
          // 通知ZK
          //
          configMgr.notifyZookeeper(configId);
  
          return buildSuccess(emailNotification);
      }