Quartz实现任务调度

       Quartz是java开源的一个定时任务的工具，它本身不仅可以实现固定时间的定时任务计算还可以实现类似Crontab的指定时间点间隔的定时任务计算。这篇文章以代码为主讲述了如何实现Quartz的任务调度。废话不多说，直接上代码~

一、pom.xml文件的配置

<!-- https://mvnrepository.com/artifact/org.quartz-scheduler/quartz-jobs -->
	<dependency>
      <groupId>org.quartz-scheduler</groupId>
      <artifactId>quartz-jobs</artifactId>
      <version>2.3.0</version>
	</dependency>
	<!-- https://mvnrepository.com/artifact/org.quartz-scheduler/quartz -->
	<dependency>
      <groupId>org.quartz-scheduler</groupId>
      <artifactId>quartz</artifactId>
      <version>2.3.0</version>
	</dependency>

二、MyJob.java代码

package com.xzw.quartz;

import org.quartz.Job;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;
/**
 * 
 * @author xzw
 *
 */
public class MyJob implements Job{

	@Override
	public void execute(JobExecutionContext arg0) throws JobExecutionException {
		// 实现业务逻辑
		System.out.println("Hello everyone, I am xzw.");
		
	}

}

三、TestQuartz.java代码

package com.xzw.quartz;

import java.text.ParseException;
import java.util.Date;

import org.quartz.JobBuilder;
import org.quartz.JobDetail;
import org.quartz.JobKey;
import org.quartz.Scheduler;
import org.quartz.SchedulerException;
import org.quartz.SimpleScheduleBuilder;
import org.quartz.Trigger;
import org.quartz.TriggerBuilder;
import org.quartz.impl.StdSchedulerFactory;
import org.quartz.impl.triggers.CronTriggerImpl;

/**
 * 
 * @author xzw
 *
 */
public class TestQuartz {
	public void testSimple(){
		try {
			Scheduler scheduler = StdSchedulerFactory.getDefaultScheduler();
			//开始
			scheduler.start();
			//唯一标识
			JobKey jobKey = new JobKey("test_1", "test");
			JobDetail jobDetail = JobBuilder.newJob(MyJob.class).withIdentity(jobKey).build();
			Trigger trigger = TriggerBuilder.newTrigger().withIdentity("testTrigger","simpleTrigger")
					//延迟一秒执行
					.startAt(new Date(System.currentTimeMillis() + 1000))
					//每隔一秒执行，并且一直重复
					.withSchedule(SimpleScheduleBuilder.simpleSchedule().withIntervalInSeconds(1).repeatForever())
					.build();
			scheduler.scheduleJob(jobDetail, trigger);
			
			try {
				Thread.sleep(5000);
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			//删除job
//			this.shutDown(scheduler, jobKey);
		} catch (SchedulerException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
	}
	
	public void testCrontab(){
		//通过schedule工厂类获得一个Schedule类
		Scheduler scheduler = null;
		try {
			scheduler = StdSchedulerFactory.getDefaultScheduler();
		} catch (SchedulerException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		//初始化一个JobDetail
		JobKey jobKey = new JobKey("test_2","test");
		JobDetail jobDetail = JobBuilder.newJob(MyJob.class).withIdentity(jobKey).build();
		//初始化一个Crontab触发器，设置触发器名称和触发器所属的组名及优先级
		CronTriggerImpl cronTrigger = new CronTriggerImpl();
		try {
			cronTrigger.setCronExpression("0/5 * * * * ?");
		} catch (ParseException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		cronTrigger.setName("testCronTrigger");
		cronTrigger.setGroup("cronTrigger");
		cronTrigger.setPriority(8);
		//交给调度器调度运行JobDetail和Trigger
		try {
			scheduler.scheduleJob(jobDetail, cronTrigger);
			//启动调度器
			scheduler.start();
		} catch (SchedulerException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
//		this.shutDown(scheduler, jobKey);
	}
	
	/**
	 * 定义删除job的方法
	 * @param scheduler
	 * @param jobKey
	 */
	public void shutDown(Scheduler scheduler, JobKey jobKey){
		try {
			scheduler.deleteJob(jobKey);
			scheduler.shutdown();
		} catch (SchedulerException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	public static void main(String[] args) {
		new TestQuartz().testSimple();
		new TestQuartz().testCrontab();
	}

}

四、测试结果

       至此，一个简单的任务调度就实现了，大家可以自己编辑自己的业务逻辑进行进一步的测试~

      你们在此过程中还遇到了什么问题，欢迎留言，让我看看你们都遇到了哪些问题。