关闭线程池标准方法

private void monitorTask(ExecutorService executorService) {
        while (getState() != InfoSystemStateEnum.ONLINE.getState()) {
            //通知线程池关闭（不再接收新任务）
            executorService.shutdown();
            try {
                //历史任务是否执行完毕
                if (!executorService.awaitTermination(5000, TimeUnit.MILLISECONDS)) {
                    //强制终止正在执行的任务
                    executorService.shutdownNow();
                }
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }