Example of Cron Trigger
In this section we are just providing you a Cron
Trigger example and by this, you can better understand the working of cron
trigger.
Description of Program
In this following program we are just creating a Quartz
application with the help of cron trigger. For this, we have to make two classes
one is job class (CronJob.java) that is implementation of Job
interface and second one is scheduler class. In scheduler class (CronSchedule.java),
firstly we need the object of scheduler and for this we have to instantiate the SchedulerFactory
and invoke its getScheduler() method. After getting the scheduler we
require to instantiate the JobDetail object with the attributes like job
name, group name and the job class name. Now we used Cron Trigger to firing the
job repetitively after the specified time. After doing all these things we get
the simple message like "Welcome to RoseIndia.net" and date
specified intervals.
Description of Code
CronTrigger("cronTrigger","group2","0
0/1 * * * ?");
By the above constructor we just create the CronTrigger
object with the trigger name, group name and the cron expression. Cron
Expression are used to configuring the instance of Cron-Trigger. And this corn
expression are used to just execute the job after one minute indefinitely.
Here is the code of Job Class (CronJob.class)
:
import org.quartz.Job;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;
import java.util.*;
public class CronJob implements Job {
public void execute(JobExecutionContext arg0) throws JobExecutionException {
System.out.println("Welcome to RoseIndia.net :"+new Date());
}
}
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Here is the code of Schedule Class
(CronSchedule.class) :
import org.quartz.CronTrigger;
import org.quartz.Scheduler;
import org.quartz.SchedulerFactory;
import org.quartz.impl.StdSchedulerFactory;
import org.quartz.JobDetail;
public class CronSchedule {
public CronSchedule ()throws Exception {
SchedulerFactory sf=new StdSchedulerFactory();
Scheduler sched=sf.getScheduler();
JobDetail jd=new JobDetail("job1","group1",CronJob.class);
CronTrigger ct=new CronTrigger("cronTrigger","group2","0 0/1 * * * ?");
sched.scheduleJob(jd,ct);
sched.start();
}
public static void main(String args[]){
try{
new CronSchedule();
}catch(Exception e){}
}
}
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Output of the program :
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log4j:WARN No appenders could be found for logger (org.quartz.simpl.SimpleThreadPool).
log4j:WARN Please initialize the log4j system properly.
Welcome to RoseIndia.net :Fri Feb 23 15:17:00 GMT+05:30
2007
Welcome to RoseIndia.net :Fri Feb 23 15:18:00 GMT+05:30
2007
Welcome to RoseIndia.net :Fri Feb 23 15:19:00 GMT+05:30 2007 |
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