Quartz的Hello world

1.准备环境jar包Your project will need (at least) the Quartz core library, named quartz-x.y.z.jar (where x.y.z is a version number), in its classpath.if you are a Maven user you can add the dependencies (only the first below is required):

<dependency>
<groupId>org.quartz-scheduler</groupId>
<artifactId>quartz</artifactId>
<version>2.2.1</version>
</dependency>
<dependency>
<groupId>org.quartz-scheduler</groupId>
<artifactId>quartz-jobs</artifactId>
<version>2.2.1</version>
</dependency>
2.通过工厂调用Schedulers，只有当start()方法被调用时，才会触发定时器操作。

// Grab the Scheduler instance from the Factory
Scheduler scheduler = StdSchedulerFactory.getDefaultScheduler();

// and start it off
scheduler.start();

3.引入相关API

　import org.quartz.Scheduler;
import org.quartz.SchedulerException;
import org.quartz.impl.StdSchedulerFactory;
import static org.quartz.JobBuilder.*;
import static org.quartz.TriggerBuilder.*;

import static org.quartz.SimpleScheduleBuilder.*;

4.实现Job接口，并编写execute方法

public class MyJob implements org.quartz.Job {

public MyJob() {
}

public void execute(JobExecutionContext context) throws JobExecutionException {
System.err.println("Hello World!  MyJob is executing.");
}
}
5.And then schedule those jobs with triggers that define at what time(s) the job should run.

// define the job and tie it to our MyJob class
JobDetail job = newJob(MyJob.class)
.withIdentity("job1", "group1")
.build();

// Trigger the job to run now, and then repeat every 40 seconds
Trigger trigger = newTrigger()
.withIdentity("trigger1", "group1")
.startNow()
.withSchedule(simpleSchedule()
.withIntervalInSeconds(40)
.repeatForever())
.build();

// Tell quartz to schedule the job using our trigger
scheduler.scheduleJob(job, trigger);