Scheduled task, Java (1)

In general, the priority is quartz> scheduledthreadpoolexecutor> timer.

 

Method	Scheduling Method	Thread mode	Exception Handling
Timer (not recommended)	Based on absolute time, tasks are sensitive to system time changes.	All timertasks are executed in a single thread. If a timertask is time-consuming, the execution of other timertasks is affected.	Timertask does not capture unchecked exceptions thrown by timertask. Therefore, when an exception is thrown, Timer terminates, causing the unexecuted timertask to stop executing.
Scheduledthreadpoolexecutor	Based on relative time. This also means that the requirement "Please help me execute mytask at every day" cannot be implemented.	Construct a fixed thread pool to execute tasks	Properly handled, without affecting the execution of other tasks
Quartz	Job + trigger. A job is an executable task that can be scheduled. A trigger can schedule a job. It can process absolute time & relative time.	The thread pool size can be specified.	Properly handled, without affecting the execution of other tasks

 

 

 

 

1. Timer

Timer timer = new Timer();

timer.schedule(new TimerTask() {

    private int i=0;

    @Override

    public void run() {

        System.out.println("Round " + i++);

    }

}, 0, 5000);//5s

 

2. scheduleatfixedrate ()

ScheduledThreadPoolExecutor pool = new ScheduledThreadPoolExecutor(5);

        pool.scheduleAtFixedRate(new Runnable() {

            private int i=0;

            @Override

            public void run() {

                System.out.println("Round " + i++);

            }

        }, 0, 5, TimeUnit.SECONDS);

 

 

3. Quartz

Look at Classroom 2: http://www.cnblogs.com/alipayhutu/archive/2012/06/05/2536617.html

 

 

 

Http://www.ibm.com/developerworks/cn/java/j-quartz/

Http://www.opensymphony.com/quartz/

Http://blog.csdn.net/szwangdf/article/details/6158646

Http://blog.csdn.net/masterseventeen/article/details/3443114