quartz – Esempio schedulazione job

Quartz è un framework che permette di schedulare processi da java.
Da questo link si può scaricare tutto il necessario.

Quartz Job

package com;

import java.util.Date;

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

public class HelloJob implements Job {

  public void execute(JobExecutionContext arg0) throws JobExecutionException {

    System.out.println("Hello World Quartz Scheduler:  " + new Date());

  }
}
Quartz Trigger
Definisce quando quartz deve eseguire il job:

   //trigger il job ogni 5 secondi
    Trigger trigger = TriggerBuilder
        .newTrigger()
        .withIdentity("helloTriggerName", "group1")
        .withSchedule(
          CronScheduleBuilder.cronSchedule("0/5 * * * * ?"))
        .build();
Scheduler
Linka il job con il trigger:
    // schedule it
    Scheduler scheduler = new StdSchedulerFactory().getScheduler();
    scheduler.start();

    scheduler.scheduleJob(job, trigger);

Esempio Completo

HelloSchedule.java
  package com;
import java.util.Date;  import org.quartz.CronScheduleBuilder; import org.quartz.CronTrigger; import org.quartz.JobBuilder; import org.quartz.JobDetail; import org.quartz.Scheduler; import org.quartz.SchedulerFactory; import org.quartz.SimpleTrigger; import org.quartz.Trigger; import org.quartz.TriggerBuilder; import org.quartz.impl.StdSchedulerFactory;  public class HelloSchedule {   public HelloSchedule() throws Exception {     //     JobDetail job = JobBuilder.newJob(HelloJob.class)         .withIdentity("helloJobName", "group1").build();              //trigger il job ogni 5 secondi     Trigger trigger = TriggerBuilder         .newTrigger()         .withIdentity("helloTriggerName", "group1")         .withSchedule(           CronScheduleBuilder.cronSchedule("0/5 * * * * ?"))         .build();          // schedule it     Scheduler scheduler = new StdSchedulerFactory().getScheduler();     scheduler.start();     scheduler.scheduleJob(job, trigger);   }    public static void main(String args[]) {     try {       new HelloSchedule();     }     catch (Exception e) {     }   } } 


Esecuzione
Lanciando il main si ha l’esecuzione del job ogni 5 secondi: