下次獲取日期在凌晨1點

Question

爲了運行一個後臺服務，我想爲每日凌晨1點運行一個線程。我怎樣才能在java中獲得這個日期？

Calendar cal = Calendar.getInstance(); 
cal.set(Calendar.HOUR_OF_DAY, HOUR_OF_EXECUTION); 
Date date = cal.getTime(); 

沒有工作。

Answer 1

你應該去Quartz。

• Here is some sample code.

OR

Timer timer = new Timer(); 
final Callable c = callable; 
TimerTask task = new TimerTask() { 
    public void run() { 
      c.call(); 
    } 
} 
t.scheduleAtFixedRate(task, firstExecuteDate, 86400000); // every day 

因此給firstExecuteDate和你的事情做，更在獲得下一個執行 - 現在

爲了得到下一個日期時間下午1點。

Calendar cal = Calendar.getInstance(); 
Calendar calAtOne = Calendar.getInstance(); 
calAtOne.set(Calendar.HOUR_OF_DAY,13); 
calAtOne.set(Calendar.MINUTE,00); 
calAtOne.set(Calendar.SECOND,00); 

if(calAtOne.after(cal)){ 
    return calAtOne; 
}else{ 
    cal.add(Calendar.DATE,1); 
    cal.set(Calendar.HOUR_OF_DAY,13); 
    cal.set(Calendar.MINUTE,00); 
    cal.set(Calendar.SECOND,00); 
    return cal; 
} 

currentMillis - (nextExecDate returned By above code)