我有一段代码,必须在未来的某个日期执行,假设我有一个未来的日期,我想在该日期+1分钟后执行一段代码,,但只执行一次。我知道我要用一个java Timer和TimerTask .For示例来做这样的事情:
import java.util.Calendar;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;
public class Main {
public static void main(String[] args) {
Calendar myDate = Calendar.getInstance();
myDate.add(Calendar.MINUTE, 1);
Date afterOneMinute = myDate.getTime();
System.out.println("Scheduled at:" + afterOneMinute);
Timer timer = new Timer();
timer.schedule(new TimerTask() {
@Override
public void run() {
System.out.println("Executed at:" + (new Date()));
}
}, afterOneMinute);
}
}
我正在寻找一种优雅的方式来使用ScheduledExecutorService,来达到相同的目的,以便有一个特定的池,因为这个池将用于多个调用。有人能帮帮我吗?
发布于 2018-06-17 23:52:08
您可以使用ScheduledExecutorService.schedule(Runnable command, long delay, TimeUnit unit)
long delay = afterOneMinute.getTime() - System.currentTimeMillis();
ScheduledExecutorService executorService = ...;
executorService.schedule(runnable, delay, TimeUnit.MILLISECONDS);
发布于 2018-06-17 23:54:34
您可以从Executors
获取ScheduledExecutorService
,获取SingleThread
版本或MultipleThread
Executors.newSingleThreadScheduledExecutor
runnable
、duration
及其TimeUnit
:ScheduledExecutorService.schedule(Runnable command, long delay, TimeUnit unit)
如果要设置持续时间,请执行以下操作:
ScheduledExecutorService exe = Executors.newSingleThreadScheduledExecutor();
// or Executors.newScheduledThreadPool(2); if you have multiple tasks
exe.schedule(() -> System.out.println("Executed at:" + (new Date())), 1, TimeUnit.MINUTES);
如果您想要使用LocalDateTime
:
ScheduledExecutorService exe = Executors.newSingleThreadScheduledExecutor();
// or Executors.newScheduledThreadPool(2); if you have multiple tasks
LocalDateTime date = LocalDateTime.of(2018, 6, 17, 18, 30, 0);
exe.schedule(
() -> System.out.println("Executed at:" + (new Date())),
LocalDateTime.now().until(date, ChronoUnit.MINUTES),
TimeUnit.MINUTES);
https://stackoverflow.com/questions/50898177
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