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