public class TimerTest {
 Timer timer;
 public TimerTest(int time){
  timer = new Timer();
  timer.schedule(new timerTaskTest(),time*1000);//timer.schedule(执行的方法，延迟多久执行(ms))
 }

 public static void main(String[] args) {
  System.out.println("timer begin...");
  new TimerTest(3);
 }

 class timerTaskTest extends TimerTask{
  @Override
  public void run() {
   System.out.println("time's up!!");
  }
 }
 }

public class TimerTest1 {
  Timer timer;

  public TimerTest1(){
    Date time = getTime();
    System.out.println("指定时间time="+time);
    timer = new Timer();
    timer.schedule(new TimerTaskTest1(),time);//timer.schedule(执行的方法，要执行的时间)
  }

  public Date getTime(){//设置执行时间
    Calendar calendar = Calendar.getInstance();
    calendar.set(Calendar.HOUR,5);
    calendar.set(Calendar.MINUTE,46);
    calendar.set(Calendar.SECOND,00);
    Date time = calendar.getTime();

    return time;
  }

  public static void main(String[] args) {
    new TimerTest1();
  }

  class TimerTaskTest1 extends TimerTask{
    public void run() {
      System.out.println("指定时间执行线程任务...");
    }
  }
}

public class TimerTest2 {
  Timer timer;
  public TimerTest2(){
    timer = new Timer();
    timer.schedule(new TimerTaskTest2(),1000,2000);//tiemr.schedule(执行的方法,延迟时间,多久执行一次)
  }

  class TimerTaskTest2 extends TimerTask{
    @Override
    public void run() {
      System.out.println("本次任务执行时间"+new Date());
    }
  }

  public static void main(String[] args) {
    new TimerTest2();
  }
}

<listener> 
    <listener-class>com.sxl.ContextListener</listener-class>  
</listener>