jdk自带的Timer定时器的使用示例

Timer定时器

package com.ttpod.task;

import java.util.Date;

import java.util.Timer;

import java.util.TimerTask;

public class TaskManager {

//对象

SomeService someService = new SomeService();

//日期

Date date = new Date();

//每次提前3秒钟执行任务

long three_second = 3000;

//定时器

Timer timer = new Timer();

//执行任务

public void runTask(){

System.out.println("start schedule task .......");

timer.schedule(new TargetTask(),0);

}

/**

* 任务

* @author luowei

*/

private class TargetTask extends TimerTask {

@Override

public void run() {

Long expir_in = Long.valueOf(someService.doSomeThing());

date.setTime(expir_in-three_second);

timer.schedule(new TargetTask(), date);

System.out.println("task has run.......");

}

}

/**

* main方法

* @param args 参数

*/

public static void main(String[] args) {

TaskManager manager = new TaskManager();

manager.runTask();

}

}

/**

* 目标service，需要定时执行目标service中的doSomeThing方法

* @author luowei

*

*/

class SomeService{

/**

* 返回long型格式的时间字符串

* @return 字符串

*/

public String doSomeThing() {

Date date = new Date();

date.setTime(date.getTime()+5000);

return String.valueOf(date.getTime());

}

}