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());

    }

}

 

转载于:https://www.cnblogs.com/luowei010101/archive/2012/08/14/2638501.html