让一个任务整点运行

来源：互联网发布：static php 编辑：程序博客网时间：2024/04/30 10:08

OneHour.java类：import java.util.Calendar;import java.util.Date;import java.util.Timer;public class OneHour {private final static long JOB_INTERNAL = 1000 * 60 * 60;//隔一个小时运行一次，如果是测试，可以改小一点public static void main(String[] args) {Timer timer = new Timer();Calendar currentTime = Calendar.getInstance();currentTime.setTime(new Date());int currentHour = currentTime.get(Calendar.HOUR);currentTime.set(Calendar.HOUR, currentHour + 1);currentTime.set(Calendar.MINUTE, 0);currentTime.set(Calendar.SECOND, 0);currentTime.set(Calendar.MILLISECOND, 0);//下面几行是相隔时间短一点的测试代码/*currentTime.set(Calendar.HOUR, currentTime.get(Calendar.HOUR));currentTime.set(Calendar.MINUTE, currentTime.get(Calendar.MINUTE));currentTime.set(Calendar.SECOND, currentTime.get(Calendar.SECOND));currentTime.set(Calendar.MILLISECOND, currentTime.get(Calendar.MILLISECOND));*/Date NextHour = currentTime.getTime();System.out.println(NextHour);timer.scheduleAtFixedRate(new MyTask(), NextHour, JOB_INTERNAL);}}

MyTask.java类：

import java.util.Date;import java.util.TimerTask;class MyTask extends TimerTask {@Overridepublic void run() {System.out.println("mytask： " + new Date());try {Thread.sleep(10000);//设置让它休眠一段时间，测试下一次运行时间是否还是整点} catch (InterruptedException e) {e.printStackTrace();}}}