How I can run my TimerTask everyday 2 PM?
I want to execute a job everyday 2PM. Which method of java.util.Timer
I can use to schedule my job?
After 2Hrs, run it will stop the job and reschedule for next day 2PM.
Calendar today = Calendar.getInstance();
today.set(Calendar.HOUR_OF_DAY, 2);
today.set(Calendar.MINUTE, 0);
today.set(Calendar.SECOND, 0);
// every night at 2am you run your task
Timer timer = new Timer();
timer.schedule(new YourTask(), today.getTime(), TimeUnit.MILLISECONDS.convert(1, TimeUnit.DAYS)); // period: 1 day
You could use Timer.schedule(TimerTask task, Date firstTime, long period)
method, setting firstTime
to 2PM today and the setting the period
to 24-hours:
Schedules the specified task for repeated fixed-delay execution, beginning at the specified time. Subsequent executions take place at approximately regular intervals, separated by the specified period.
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.Timer;
import java.util.TimerTask;
public class MyTimerTask extends TimerTask {
private final static long ONCE_PER_DAY = 1000*60*60*24;
//private final static int ONE_DAY = 1;
private final static int TWO_AM = 2;
private final static int ZERO_MINUTES = 0;
@Override
public void run() {
long currennTime = System.currentTimeMillis();
long stopTime = currennTime + 2000;//provide the 2hrs time it should execute 1000*60*60*2
while(stopTime != System.currentTimeMillis()){
// Do your Job Here
System.out.println("Start Job"+stopTime);
System.out.println("End Job"+System.currentTimeMillis());
}
}
private static Date getTomorrowMorning2AM(){
Date date2am = new java.util.Date();
date2am.setHours(TWO_AM);
date2am.setMinutes(ZERO_MINUTES);
return date2am;
}
//call this method from your servlet init method
public static void startTask(){
MyTimerTask task = new MyTimerTask();
Timer timer = new Timer();
timer.schedule(task,getTomorrowMorning2AM(),1000*10);// for your case u need to give 1000*60*60*24
}
public static void main(String args[]){
startTask();
}
}
The easiest way I've found of doing this has always been through Task Scheduler in Windows and cron in Linux.
However for Java, take a look at Quartz Scheduler
From their website:
Quartz is a full-featured, open source job scheduling service that can be integrated with, or used along side virtually any Java EE or Java SE application - from the smallest stand-alone application to the largest e-commerce system. Quartz can be used to create simple or complex schedules for executing tens, hundreds, or even tens-of-thousands of jobs; jobs whose tasks are defined as standard Java components that may execute virtually anything you may program them to do. The Quartz Scheduler includes many enterprise-class features, such as JTA transactions and clustering.