Timer 及 TimerTask 相关使用代码

代码1:

package com.tg.email;

import java.text.SimpleDateFormat;

import java.util.Calendar;

import java.util.Date;

import java.util.Timer;

import java.util.TimerTask;

public class Timeer {

public static void showTimer() {

TimerTask task = new TimerTask() {

@Override

public void run() {

System.out.print(new SimpleDateFormat("HH:mm:ss").format(System.currentTimeMillis()));

System.out.println("执行定时任务！！！");

}

};

Calendar calendar = Calendar.getInstance();

int year = calendar.get(Calendar.YEAR);

int month = calendar.get(Calendar.MONTH);

int day = calendar.get(Calendar.DAY_OF_MONTH);

/*** 时间自己修改 ***/

System.out.println("year:"+year);

System.out.println("month:"+(month));

System.out.println("day:"+day);

calendar.set(year, month, day, 13, 00, 03); //主要改这里,年、月、日、时、分、秒

Date date = calendar.getTime();

Timer timer = new Timer();

timer.schedule(task, date,1000);

}

public static void main(String[] args) {

showTimer();

}

}

代码2:

package com.lzw.schedule;

import java.util.TimerTask;

public abstract class SchedulerTask implements Runnable

{

final Object lock = new Object();

int state = VIRGIN;

static final int VIRGIN = 0;

static final int SCHEDULED = 1;

static final int CANCELLED = 2;

TimerTask timerTask = null;

protected SchedulerTask()

{

}

public abstract void run();

public boolean cancel()

{

synchronized (lock)

{

if (timerTask != null)

{

timerTask.cancel();

}

boolean result = (state == SCHEDULED);

state = CANCELLED;

return result;

}

}

public long scheduleExecutionTime()

{

synchronized (lock)

{

return timerTask == null ? 0 : timerTask.scheduledExecutionTime();

}

}

}

代码3:

package com.lzw.schedule;

public class AlarmClock

{

private final Scheduler scheduler = new Scheduler();

private final int hourofDay, minute, second;

public AlarmClock(int hourOfDay, int minute, int second)

{

this.hourofDay = hourOfDay;

this.minute = minute;

this.second = second;

}

public void start()

{

scheduler.schedule(new SchedulerTask()

{

public void run()

{

System.out.println("时间到

");

}

}, new DailyIterator(hourofDay, minute, second));

}

public static void main(String[] args)

{

AlarmClock alarmClock = new AlarmClock(17, 58, 0);

alarmClock.start();

}

}

代码4:

package com.lzw.schedule;

import java.util.Date;

import java.util.Timer;

import java.util.TimerTask;

public class Scheduler

{

class SchedulerTimerTask extends TimerTask

{

private SchedulerTask schedulerTask = null;

private ScheduleIterator scheduleIterator = null;

public SchedulerTimerTask(SchedulerTask schedulerTask,

ScheduleIterator scheduleIterator)

{

this.schedulerTask = schedulerTask;

this.scheduleIterator = scheduleIterator;

}

public void run()

{

schedulerTask.run();

reschedule(schedulerTask, scheduleIterator);

}

}

private final Timer timer = new Timer();

public Scheduler()

{

}

public void cancel()

{

timer.cancel();

}

public void schedule(SchedulerTask schedulerTask,

ScheduleIterator scheduleIterator)

{

Date time = scheduleIterator.next();

if (time == null)

{

schedulerTask.cancel();

}

else

{

synchronized (schedulerTask.lock)

{

if (schedulerTask.state != SchedulerTask.VIRGIN)

{

throw new IllegalStateException("Task already scheduled or cancelled");

}

schedulerTask.state = SchedulerTask.SCHEDULED;

schedulerTask.timerTask = new SchedulerTimerTask(schedulerTask,

scheduleIterator);

timer.schedule(schedulerTask.timerTask, time);

}

}

}

private void reschedule(SchedulerTask schedulerTask,

ScheduleIterator scheduleIterator)

{

Date time = scheduleIterator.next();

if (time == null)

{

schedulerTask.cancel();

}

else

{

synchronized (schedulerTask.lock)

{

if (schedulerTask.state != SchedulerTask.CANCELLED)

{

schedulerTask.timerTask = new SchedulerTimerTask(schedulerTask,

scheduleIterator);

timer.schedule(schedulerTask.timerTask, time);

}

}

}

}

}

代码5:

package com.lzw.schedule;

import java.util.Calendar;

import java.util.Date;

public interface ScheduleIterator

{

public Date next();

}

class DailyIterator implements ScheduleIterator

{

private final Calendar calendar = Calendar.getInstance();

public DailyIterator(int hourOfDay, int minute, int second, Date date)

{

calendar.setTime(date);

calendar.set(Calendar.HOUR_OF_DAY, hourOfDay);

calendar.set(Calendar.MINUTE, minute);

calendar.set(Calendar.SECOND, second);

calendar.set(Calendar.MILLISECOND, 0);

if (!calendar.getTime().before(date)) {

calendar.add(Calendar.DATE, -1);

}

}

public DailyIterator(int hourOfDay, int minute, int second)

{

Date date = new Date();

calendar.setTime(date);

calendar.set(Calendar.HOUR_OF_DAY, hourOfDay);

calendar.set(Calendar.MINUTE, minute);

calendar.set(Calendar.SECOND, second);

calendar.set(Calendar.MILLISECOND, 0);

if (!calendar.getTime().before(date)) {

calendar.add(Calendar.DATE, -1);

}

}

public Date next() {

calendar.add(Calendar.DATE, 1);

return calendar.getTime();

}

}

代码6:

package com.lzw;

import java.util.Calendar;

import java.util.Date;

import java.util.Timer;

import java.util.TimerTask;

public class Test

{

private Calendar startSee = null; //开始看病时间

public Test()

{

startSee = Calendar.getInstance();

System.out.println("感冒了." + startSee.getTime().toLocaleString());

}

public Date getScheduleDate(int day)

{

// startSee.add(Calendar.DATE, 1); //按天来计算

startSee.add(Calendar.SECOND, day); //按秒来计算

return startSee.getTime();

}

public void start(int day)

{

final Timer timer = new Timer();

timer.schedule(new TimerTask()

{

public void run()

{

System.out.println("回访啦.." + new Date().toLocaleString());

timer.cancel();

}

}, getScheduleDate(day));

}

public static void main(String[] args)

{

//由于timer调系统时间不太起作用,所以拿秒来做测试.

Test test = new Test();

test.start(10);

test.start(15);

test.start(20);

test.start(30);

}

}

部分代码来源于http://topic.csdn.net/u/20100705/18/73d51340-631f-4b9a-89e7-3125df30fec9.html?seed=351074017&r=66736573#r_66736573