ScheduledExecutorService任务定时代码示例

package com.effective.common.concurrent.execute;import java.text.DateFormat;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Date;import java.util.concurrent.Executors;import java.util.concurrent.ScheduledExecutorService;import java.util.concurrent.TimeUnit;public class Schedule {	private static DateFormat dateFormat = new SimpleDateFormat("yy-MM-dd HH:mm:ss");	private static DateFormat dayFormat = new SimpleDateFormat("yy-MM-dd");	private static ScheduledExecutorService excutor = Executors.newSingleThreadScheduledExecutor();	/**   * 按指定频率周期执行某个任务 <br>   * 初始化延迟0ms开始执行，每隔5ms重新执行一次任务。   */	public void fixedRate(){		excutor.scheduleAtFixedRate(new EchoServer(), //执行线程		0, //初始化延迟		5000, //两次开始的执行的最小时间间隔		TimeUnit.MILLISECONDS //计时单位		);	}	/**   *    */	public void fixDelay(){		excutor.scheduleWithFixedDelay(new EchoServer(),//执行线程 		0, //初始化延迟		5000, //前一次执行结束到下一次执行开始的间隔时间		TimeUnit.MILLISECONDS);	}	/**   * 每天晚上8点执行一次   */	public void dayOfDelay(String time){		ScheduledExecutorService executor = Executors.newScheduledThreadPool(1);		long oneDay = 24 * 60 * 60 * 1000;		long initDelay = getTimeMillis("20:00:00") - System.currentTimeMillis();		initDelay = initDelay > 0 ? initDelay : oneDay + initDelay;		executor.scheduleAtFixedRate( 		        new EchoServer(), 		        initDelay, 		        oneDay, 		        TimeUnit.MILLISECONDS);	}	/**   * 获取给定时间对应的毫秒数   * @param string "HH:mm:ss"   * @return   */	private static long getTimeMillis(String time) {		try {			Date currentDate = dateFormat.parse(dayFormat.format(new Date()) + " " +time);			return currentDate.getTime() ;		}		catch (ParseException e) {			e.printStackTrace();		}		return 0;	}	public static void main(String[] args){		Schedule schedule = new Schedule();		schedule.fixedRate();		schedule.fixDelay();	}}