如何在Java中安排定期任务?
我需要安排一个任务以固定的时间间隔运行。 我如何在长时间间隔(例如每8小时)支持下做到这一点?
我目前正在使用java.util.Timer.scheduleAtFixedRate
。 java.util.Timer.scheduleAtFixedRate
是否支持长时间间隔?
使用ScheduledExecutorService:
private final ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(1);
scheduler.scheduleAtFixedRate(yourRunnable, 8, 8, TimeUnit.HOURS);
你应该看看Quartz它是一个Java EE框架,适用于EE和SE版本,并允许定义作业来执行特定的时间
试试这种方式 - >
首先创建一个运行你的任务的类TimeTask,它看起来像:
public class CustomTask extends TimerTask {
public CustomTask(){
//Constructor
}
public void run() {
try {
// Your task process
} catch (Exception ex) {
System.out.println("error running thread " + ex.getMessage());
}
}
然后在主类中实例化任务,并按指定日期定期运行它:
public void runTask(){
Calendar calendar = Calendar.getInstance();
calendar.set(
Calendar.DAY_OF_WEEK,
Calendar.MONDAY
);
calendar.set(Calendar.HOUR_OF_DAY, 15);
calendar.set(Calendar.MINUTE, 40);
calendar.set(Calendar.SECOND, 0);
calendar.set(Calendar.MILLISECOND, 0);
Timer time = new Timer(); // Instantiate Timer Object
// Start running the task on Monday at 15:40:00, period is set to 8 hours
// if you want to run the task immediately, set the 2nd parameter to 0
time.schedule(new CustomTask(), calendar.getTime(), TimeUnit.HOURS.toMillis(8));
}
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