按时间间隔执行

来源：互联网发布：淘宝如何拍下商品编辑：程序博客网时间：2024/04/29 02:41

import java.util.Timer;
import java.util.TimerTask;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.Date;

public class FetchMail extends TimerTask {

/**
* Construct and use a TimerTask and Timer.
*/

/**
* Implements TimerTask's abstract run method.
*/
public void run(){
    //toy implementation
    time=time+1;
    System.out.println(time);
}

// PRIVATE ////
private static int time=1;
//expressed in milliseconds
//private final static long fONCE_PER_DAY = 1000*60*60*24;
private final static long fONCE_PER_DAY = 1000*2;
private final static int SECOND = 3;
private final static int fONE_DAY = 1;
private final static int fFOUR_AM = 4;
private final static int fZERO_MINUTES = 0;

private static Date getTomorrowMorning4am(){
    Calendar tomorrow = new GregorianCalendar();
    //tomorrow.add(Calendar.DATE, fONE_DAY);
    tomorrow.add(Calendar.SECOND,fONE_DAY);
    Calendar result = new GregorianCalendar(
      tomorrow.get(Calendar.YEAR),
      tomorrow.get(Calendar.MONTH),
      tomorrow.get(Calendar.DATE),
      fFOUR_AM,
      fZERO_MINUTES
    );
    System.out.println("11");
    return tomorrow.getTime();
}

/**
* Method main
*
*
* @param args
*
*/
public static void main(String[] args) {
  // TODO: Add your code here
      TimerTask fetchMail = new FetchMail();
    Calendar tomorrow = new GregorianCalendar();
    //tomorrow.add(Calendar.DATE, fONE_DAY);
    tomorrow.add(Calendar.SECOND, SECOND);
    System.out.println(tomorrow.getTime());
    Calendar tomorrow1 = new GregorianCalendar();
    //tomorrow.add(Calendar.DATE, fONE_DAY);
    tomorrow1.add(Calendar.SECOND, SECOND+2);

    System.out.println(tomorrow1.getTime());
    //perform the task once a day at 4 a.m., starting tomorrow morning
    //(other styles are possible as well)
    Timer timer = new Timer();
    timer.scheduleAtFixedRate(fetchMail, getTomorrowMorning4am(), fONCE_PER_DAY);
}
}