java - 如何调用线程在特定时间运行？
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How to call a thread to run on specific time in java?
提问by Sami
I want o make threads execute at specific exact times (for example at: 2012-07-11 13:12:24 and 2012-07-11 15:23:45)
我想让线程在特定的确切时间执行（例如：2012-07-11 13:12:24 和 2012-07-11 15:23:45）
I checked ScheduledExecutorService, but it only supports executing after specific period from the first run and I don't have any fixed periods, instead I have times from database to execute tasks on.
我检查过ScheduledExecutorService，但它只支持在第一次运行后的特定时间段后执行，而且我没有任何固定时间段，而是我有时间从数据库中执行任务。
In a previous question for a different problem here, TimerTask was the solution, but obviuosly I can't make thread a TimerTaskas Runnableand TimerTaskboth have the method runwhich needs to be implemented. The question here if I make the thread extends TimerTaskand have one implementation of run(), would that work?
If not, then how it's possible to do what I'm trying to do?
在一个不同的问题，前一个问题在这里，TimerTask的是解决方案，但obviuosly我不能让一个线程TimerTask作为Runnable与TimerTask两者都有方法run需要被实现。这里的问题是，如果我让线程扩展TimerTask并实现run()，那会起作用吗？如果没有，那么怎么可能做我想做的事情？
回答by Akhi
Use TimerTask .
使用 TimerTask 。
Create a TimerTask object with a field variable as your thread. Call the Thread start from the Timer task Run method.
创建一个带有字段变量的 TimerTask 对象作为您的线程。从 Timer 任务的 Run 方法调用 Thread start。
public class SampleTask extends TimerTask {
Thread myThreadObj;
SampleTask (Thread t){
this.myThreadObj=t;
}
public void run() {
myThreadObj.start();
}
}
Configure it like this.
像这样配置它。
Timer timer new Timer();
Thread myThread= // Your thread
Calendar date = Calendar.getInstance();
date.set(
Calendar.DAY_OF_WEEK,
Calendar.SUNDAY
);
date.set(Calendar.HOUR, 0);
date.set(Calendar.MINUTE, 0);
date.set(Calendar.SECOND, 0);
date.set(Calendar.MILLISECOND, 0);
// Schedule to run every Sunday in midnight
timer.schedule(
new SampleTask (myThread),
date.getTime(),
1000 * 60 * 60 * 24 * 7
);
回答by carlspring
I think you should better use some library like the Quartz Scheduler. This is basically an implementation of cron for Java.
我认为你应该更好地使用像Quartz Scheduler这样的库。这基本上是 Java 的 cron 实现。
回答by posdef
Have you looked at CountDownLatchfrom the java.util.concurrent package? It provides a count down then triggers the thread(s) to run. I never needed to use it myself, but have seen it in use a couple times.
你看过java.util.concurrent 包中的CountDownLatch吗？它提供倒计时，然后触发线程运行。我从来不需要自己使用它，但已经看到它使用了几次。
