简单的定时任务 开始/取消

直接给代码

  public static void main(String[] arg0) throws Exception {
        final Map<String, Future> futures = new HashMap<>();
        final String jobID = "startJob";
        final CountDownLatch countDownLatch = new CountDownLatch(1);
        ScheduledExecutorService service = Executors.newSingleThreadScheduledExecutor();
        Future future = service.scheduleAtFixedRate(new Runnable(){
            private int count;
            @Override
            public void run() {
                count++;
                System.out.println("第"+count+"次开始执行任务");
                if (count == 2){  //取消任务
                    Future future = futures.get(jobID);
                    if (future != null){
                        future.cancel(true);
                    }
                    countDownLatch.countDown();
                    System.out.println("任务停止");
                }
            }
        },3000,1000, TimeUnit.MILLISECONDS);
        futures.put(jobID, future);
        countDownLatch.await();
        service.shutdown();
}