quartz 使用例子

示例版本：quartz2.3.2

原因：试下新版本api。复习下这块知识，以前写过一篇，太烂了

1、简单定时。

Scheduler defaultScheduler = null;
		try {

			defaultScheduler = StdSchedulerFactory.getDefaultScheduler();
			logger.info("");
			defaultScheduler.start();
			JobDetail job = JobBuilder.newJob(SimpleJob.class).withIdentity("job1", "group1").build();

			Trigger trigger = TriggerBuilder.newTrigger().withIdentity("trigger1", "group1").startNow()
					.withSchedule(SimpleScheduleBuilder.simpleSchedule().withIntervalInSeconds(4).repeatForever()).build();

			defaultScheduler.scheduleJob(job, trigger);
			Thread.sleep(60000);
			defaultScheduler.shutdown();
		} catch (SchedulerException e) {
			e.printStackTrace();
		} finally {
			if (defaultScheduler != null) {
				try {
					defaultScheduler.shutdown();
				} catch (SchedulerException e1) {
					e1.printStackTrace();
				}
			}
		}

2、cron表达式定时

Scheduler defaultScheduler = null;
		try {

			defaultScheduler = StdSchedulerFactory.getDefaultScheduler();
			logger.info("");
			defaultScheduler.start();
			JobDetail job = newJob(SimpleJob.class).withIdentity("job1", "group1").build();

			CronTrigger build = newTrigger().withIdentity("trigger1", "group1")
					.withSchedule(cronSchedule("0/2 * * * * ?")).build();
			defaultScheduler.scheduleJob(job, build);
			Thread.sleep(60000);
			defaultScheduler.shutdown();
		} catch (SchedulerException e) {
			e.printStackTrace();
		} finally {
			if (defaultScheduler != null) {
				try {
					defaultScheduler.shutdown();
				} catch (SchedulerException e1) {
					e1.printStackTrace();
				}
			}
		}

3、参数传递及job内改变参数。

主代码：

StdSchedulerFactory stdSchedulerFactory = new StdSchedulerFactory();
		Scheduler scheduler = stdSchedulerFactory.getScheduler();
		JobDetail job1 = JobBuilder.newJob(ColorJob.class).withIdentity("job1", "group1").build();
		job1.getJobDataMap().put(EXECUTION_COUNT, 0);
		job1.getJobDataMap().put(FAVORITE_COLOR, "RED");
		
		SimpleTrigger trigger1 = TriggerBuilder.newTrigger().withIdentity("trigger1", "group1").startNow()
				.withSchedule(SimpleScheduleBuilder.simpleSchedule().withIntervalInSeconds(3).withRepeatCount(4)).build();
	
		scheduler.scheduleJob(job1, trigger1);
		scheduler.start();
		

Job代码：

/**
 * 不允许作业的多个实例同时运行（请考虑以下情况：该作业的execute（）方法中包含需要运行34秒的代码，但使用触发器，每30秒重复一次
 * @author back
 *
 */
@PersistJobDataAfterExecution
@DisallowConcurrentExecution
public class ColorJob implements Job{

	@Override
	public void execute(JobExecutionContext context) throws JobExecutionException {
		JobDataMap dataMap = context.getJobDetail().getJobDataMap();
		String color = dataMap.getString(FAVORITE_COLOR);
		System.out.println("color:"+color);
		int count = dataMap.getInt(EXECUTION_COUNT);
		System.out.println("count : "+count);
		count++;
		dataMap.put(EXECUTION_COUNT, count);
		try {
			TimeUnit.MICROSECONDS.sleep(4);
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
	}
}

4、定时任务中产生异常。下面代码是异常后重新执行任务（一直执行），e2.unscheduleAllTriggers();这样设置后，异常就不会重新执行了

@PersistJobDataAfterExecution
@DisallowConcurrentExecution
public class ExceptionJob implements Job {

	@Override
	public void execute(JobExecutionContext context) throws JobExecutionException {

		try {
			int zero = 0;
			int calculation = 4815 / zero;
		} catch (Exception e) {
			JobExecutionException e2 = new JobExecutionException(e);
			// this job will refire immediately
			e2.refireImmediately();
			// e2.unscheduleAllTriggers();
			throw e2;
		}
	}

}

5、多个任务执行顺序。

主逻辑

SchedulerFactory sf = new StdSchedulerFactory();
		Scheduler sched = sf.getScheduler();
		JobDetail job = JobBuilder.newJob(LogJob.class).build();
		// Calculate the start time of all triggers as 5 seconds from now
		Date startTime = DateBuilder.futureDate(5, IntervalUnit.SECOND);

		// First trigger has priority of 1, and will repeat after 5 seconds
		Trigger trigger1 = newTrigger()
		    .withIdentity("PriorityNeg5Trigger5SecondRepeat")
		    .startAt(startTime)
		    .withSchedule(simpleSchedule().withRepeatCount(1).withIntervalInSeconds(5))
		    .withPriority(1)
		    .forJob(job)
		    .build();

		// Second trigger has default priority of 5 (default), and will repeat after 10 seconds
		Trigger trigger2 = newTrigger()
		    .withIdentity("Priority5Trigger10SecondRepeat")
		    .startAt(startTime)
		    .withSchedule(simpleSchedule().withRepeatCount(1).withIntervalInSeconds(10))
		    .forJob(job)
		    .build();

		// Third trigger has priority 10, and will repeat after 15 secondsTrigger trigger3 = newTrigger()
		Trigger trigger3 = newTrigger().withIdentity("Priority10Trigger15SecondRepeat")
		    .startAt(startTime)
		    .withSchedule(simpleSchedule().withRepeatCount(1).withIntervalInSeconds(15))
		    .withPriority(10)
		    .forJob(job)
		    .build();
		    
		 // Tell quartz to schedule the job using our trigger
		    sched.scheduleJob(job, trigger1);
		    sched.scheduleJob(trigger2);
		    sched.scheduleJob(trigger3);
		    
		    sched.start();

Job逻辑

@PersistJobDataAfterExecution
@DisallowConcurrentExecution
public class LogJob implements Job{

	@Override
	public void execute(JobExecutionContext context) throws JobExecutionException {
		TriggerKey key = context.getTrigger().getKey();
		String triggerName = key.getName();
		System.out.println("trigger : "+triggerName);
	}

}

看到顺序，所以定义为单线程执行。quartz。properties

org.quartz.scheduler.instanceName=PriorityExampleScheduler
# Set thread count to 1 to force Triggers scheduled for the same time to
# to be ordered by priority.
org.quartz.threadPool.threadCount=1
org.quartz.threadPool.class=org.quartz.simpl.SimpleThreadPool

org.quartz.jobStore.class=org.quartz.simpl.RAMJobStore

结论：先按顺序执行第一遍。执行完第一遍按照时间差完成第二遍

来源：CSDN

作者：MrBack

链接：https://blog.csdn.net/MrBack/article/details/103944743