Cron Example

Hi all,

I was working with Cron scheduling and with some help from the internet blogs finally i made a example out of it.  Please refer the following website for full explanation http://www.mkyong.com/java/quartz-scheduler-example/

/**
 * Scheduler Task --- This class is the one which contains the task that needs to be executed...
 *  */
public class RunMeTask
{
    public void printMe() {
        System.out.println("Run Me ~");
    }
}

/**
  * Scheduler Job --- This class is the one which implements the Job interface
    */

import java.util.Map;
import org.quartz.Job;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;

  public class RunMeJob implements Job
{

    public RunMeJob() {
    }
    public void execute(JobExecutionContext context)
    throws JobExecutionException {

        Map dataMap = context.getJobDetail().getJobDataMap();
        RunMeTask task = (RunMeTask)dataMap.get("runMeTask");
        task.printMe();
    }
}

/**
 *
 * Scheduler Job --- This class is the one which implements the Job interface to work with the Cron trigger
 */

import org.quartz.Job;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;


public class CronJob implements Job
{

    public CronJob() {
    }
    public void execute(JobExecutionContext context)
    throws JobExecutionException {

                  System.out.println("inside the cron job methoid------>>");
    }
}

/**
 *
 *  This class is the one which will initiate the trigger and schedule the job 

 */

import java.text.ParseException;
import java.util.Date;
import java.util.Map;
import org.quartz.CronTrigger;

import org.quartz.JobDetail;
import org.quartz.Scheduler;
import org.quartz.SchedulerException;
import org.quartz.SimpleTrigger;
import org.quartz.impl.StdSchedulerFactory;

public class CronLearning {
public static void main( String[] args ) throws Exception
    {
      simpleTrig();
      unixCronTrig();


    }

private static void simpleTrig() throws SchedulerException{
        RunMeTask task = new RunMeTask();

        //specify your sceduler task details
        JobDetail job = new JobDetail();

        job.setName("runMeJob");
        job.setJobClass(RunMeJob.class);

        Map dataMap = job.getJobDataMap();
        dataMap.put("runMeTask", task);

        //configure the scheduler time
        SimpleTrigger trigger = new SimpleTrigger();
        trigger.setName("runMeJobTesting");
        trigger.setStartTime(new Date(System.currentTimeMillis() + 1000));
        //trigger.setRepeatCount(SimpleTrigger.REPEAT_INDEFINITELY);
        trigger.setRepeatCount(2);
        trigger.setRepeatInterval(30000);
//trigger.setEndTime(new Date(System.currentTimeMillis() + 60000));
        //schedule it
        Scheduler scheduler = new StdSchedulerFactory().getScheduler();
        scheduler.start();
        scheduler.scheduleJob(job, trigger);
}
private static void unixCronTrig() throws SchedulerException, ParseException{
        RunMeTask task = new RunMeTask();

        //specify your sceduler task details
        JobDetail job = new JobDetail();

        job.setName("CronJob");
        job.setJobClass(CronJob.class);

        CronTrigger trigger = new CronTrigger();
        trigger.setName("CronJobTesting");
//configure the scheduler time to fire every 30 seconds
        //trigger.setCronExpression("0/30 * * * * ?");
//configure the scheduler time to fire once
        trigger.setCronExpression("10 05 07 25 6 ? 2012");
        //schedule it
        Scheduler scheduler = new StdSchedulerFactory().getScheduler();
        scheduler.start();
        scheduler.scheduleJob(job, trigger);
       
        System.out.println("cron expression --->"+trigger.getCronExpression());
}
}