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());
}
}
