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 
 * 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(); } }