// 監(jiān)控文件的變化，重新加載
executor.submit(new Runnable() {
  @Override
  public void run() {
    try {
      final Path path = FileSystems.getDefault().getPath(getMonitorDir());
      System.out.println(path);
      final WatchService watchService = FileSystems.getDefault().newWatchService();
      final WatchKey watchKey = path.register(watchService, StandardWatchEventKinds.ENTRY_MODIFY);
      while (true) {
        final WatchKey wk = watchService.take();
        for (WatchEvent<?> event : wk.pollEvents()) {
          final Path changed = (Path) event.context();
          Path absolute = path.resolve(changed);
          File configFile = absolute.toFile();
          long lastModified = configFile.lastModified();
          logger.info(lastModified + "----------------");
          // 利用文件時間戳，防止觸發(fā)兩次
          if (changed.endsWith(getLicenseName()) && lastModified != LAST_MOD && configFile.length > 0) {
            logger.info("----------------- reloading -----------------");
            LAST_MOD = lastModified; // 保存上一次時間戳
            UPDATED = true; // 設置標志位
          }
        }

        if (UPDATED) {
          reloadFile(); // 重新加載
        }
        // reset the key
        boolean valid = wk.reset();
        if (!valid) {
          logger.error("watch key invalid!");
        }
      }
    } catch (Exception e) {
      logger.error("");
    }
  }
});