Java排程应用例子

实现定时执行指定程序的功能：

1.使用Timer和TimerTask

import java.util.Timer;
import java.util.TimerTask;

public class Test {
	public static void main(String[] args) {
		Timer timer = new Timer();
		timer.schedule(new Task(), 1000, 1000);
	}
	
	static class Task extends TimerTask {
		@Override
		public void run() {
			System.out.println("The timer task is running!");
		}
	}
}

 2.使用java.util.concurrent包中的类

import static java.util.concurrent.TimeUnit.SECONDS;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledFuture;

public class Test {
	public static void main(String[] args) {
		final ScheduledExecutorService scheduler = Executors
				.newScheduledThreadPool(2);
		final Runnable beeper = new Runnable() {
			public void run() {
				System.out.println("The scheduler task is running!");
			}
		};

		//1秒后执行，每1秒执行一次
		final ScheduledFuture<?> beeperHandler = scheduler.scheduleAtFixedRate(
                                beeper, 1, 1, SECONDS);
                 //2秒后执行，执行完成后间隔5秒在执行下一次
                final ScheduledFuture<?> beeperHandler2 = scheduler.scheduleWithFixedDelay(
                                 beeper, 2, 5, SECONDS);
        }
}

   以上例子2中的定时与延时执行功能有些类似于Javascript的setInterval和setTimeout

在例子2中加入如下代码，可在指定30秒后终止排程

scheduler.schedule(new Runnable() {
			public void run() {
				beeperHandler.cancel(true);
				scheduler.shutdown();
			}
		}, 30, SECONDS);