示例代码
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();
}
}
