Quartz2第一个程序 - Quartz教程
Quartz, 是一个企业级调度工作的框架,帮助Java应用程序到调度工作/任务在指定的日期和时间运行。
本教程教作为一个入门介绍如何开发使用调度工作(在写本教程时使用的最新Quartz 2.2.1 )
1. 下载Quartz
可以从官方网站或Maven中央存储库下载Quartz库文件;
_File : _quartz.properties
org.quartz.scheduler.instanceName = MyScheduler
org.quartz.threadPool.threadCount = 3
org.quartz.jobStore.class =org.quartz.simpl.RAMJobStore
2. Quartz 作业
Quartz作业定义要运行什么?
File : HelloJob
package com.yiibai.common;
import org.quartz.Job;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;
public class HelloJob implements Job
{
public void execute(JobExecutionContext context)
throws JobExecutionException {
System.out.println("Hello Quartz!");
}
}
3. Quartz触发器
定义Quartz触发器,当Quartz运行在上面的Quartz作业。
像老版本的Quartz,仍然有两种类型的触发器在Quartz2,但API有些变化:
- SimpleTrigger – 允许设置开始时间,结束时间,重复间隔。
- CronTrigger – 允许UNIX cron表达式来指定日期和时间来运行作业。
SimpleTrigger – 每5秒运行。
Trigger trigger = TriggerBuilder
.newTrigger()
.withIdentity("dummyTriggerName", "group1")
.withSchedule(
SimpleScheduleBuilder.simpleSchedule()
.withIntervalInSeconds(5).repeatForever())
.build();
CronTrigger – 每5秒运行。
Trigger trigger = TriggerBuilder
.newTrigger()
.withIdentity("dummyTriggerName", "group1")
.withSchedule(
CronScheduleBuilder.cronSchedule("0/5 * * * * ?"))
.build();
注意 请阅读 官方文档 更多的Quartz2触发器的例子。
4. Scheduler
调度类链接“工作”和“触发器”到一起,并执行它。
Scheduler scheduler = new StdSchedulerFactory().getScheduler();
scheduler.start();
scheduler.scheduleJob(job, trigger);
5. 完整的例子
Quartz2 两个 SimpleTrigger 和 CronTrigger 完整的例子。
SimpleTrigger的例子 - 每间隔5秒运行。
package com.yiibai.quartz;
import org.quartz.JobBuilder;
import org.quartz.JobDetail;
import org.quartz.Scheduler;
import org.quartz.SimpleScheduleBuilder;
import org.quartz.Trigger;
import org.quartz.TriggerBuilder;
import org.quartz.impl.StdSchedulerFactory;
public class SimpleTriggerExample {
public static void main(String[] args) throws Exception {
// Quartz 1.6.3
// JobDetail job = new JobDetail();
// job.setName("dummyJobName");
// job.setJobClass(HelloJob.class);
JobDetail job = JobBuilder.newJob(HelloJob.class)
.withIdentity("dummyJobName", "group1").build();
//Quartz 1.6.3
// SimpleTrigger trigger = new SimpleTrigger();
// trigger.setStartTime(new Date(System.currentTimeMillis() + 1000));
// trigger.setRepeatCount(SimpleTrigger.REPEAT_INDEFINITELY);
// trigger.setRepeatInterval(30000);
// Trigger the job to run on the next round minute
Trigger trigger = TriggerBuilder
.newTrigger()
.withIdentity("dummyTriggerName", "group1")
.withSchedule(
SimpleScheduleBuilder.simpleSchedule()
.withIntervalInSeconds(5).repeatForever())
.build();
// schedule it
Scheduler scheduler = new StdSchedulerFactory().getScheduler();
scheduler.start();
scheduler.scheduleJob(job, trigger);
}
}
CronTrigger例子 - 同样,在每5秒运行作业。
package com.yiibai.quartz;
import org.quartz.CronScheduleBuilder;
import org.quartz.JobBuilder;
import org.quartz.JobDetail;
import org.quartz.Scheduler;
import org.quartz.Trigger;
import org.quartz.TriggerBuilder;
import org.quartz.impl.StdSchedulerFactory;
public class CronTriggerExample
{
public static void main( String[] args ) throws Exception
{
//Quartz 1.6.3
//JobDetail job = new JobDetail();
//job.setName("dummyJobName");
//job.setJobClass(HelloJob.class);
JobDetail job = JobBuilder.newJob(HelloJob.class)
.withIdentity("dummyJobName", "group1").build();
//Quartz 1.6.3
//CronTrigger trigger = new CronTrigger();
//trigger.setName("dummyTriggerName");
//trigger.setCronExpression("0/5 * * * * ?");
Trigger trigger = TriggerBuilder
.newTrigger()
.withIdentity("dummyTriggerName", "group1")
.withSchedule(
CronScheduleBuilder.cronSchedule("0/5 * * * * ?"))
.build();
//schedule it
Scheduler scheduler = new StdSchedulerFactory().getScheduler();
scheduler.start();
scheduler.scheduleJob(job, trigger);
}
}