什么是Quartz

Quartz是一个由java编写的开源作业调度框架，简单来说，Quartz就是启动定时任务的框架，像linux系统中的corntab，可以定时启动任务.

Quartz的单独使用

Quartz的使用必须掌握下面三个对象

1. Scheduler 定时器对象
2. JobDetail 任务对象
3. Trigger 触发器对象
   SimpleTrigger 简单触发器
   CornTrigger任务调度触发器
   使用
   导入Maven坐标

<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>

工作对象

//要实现Job接口
public class HelloJob implements Job {@Overridepublic void execute(JobExecutionContext context) throws JobExecutionException {System.out.println("Hello Quartz~~~");}}

测试用例

	     //定时器对象Scheduler scheduler = StdSchedulerFactory.getDefaultScheduler();//定义一个工作对象 设置工作名称与组名JobDetail job =JobBuilder.newJob(HelloJob.class).withIdentity("job41","group1").build();		 //定义一个触发器 简单Trigger 设置工作名称与组名 5秒触发一次Trigger trigger = TriggerBuilder.newTrigger().withIdentity("trigger1","group1").startNow().withSchedule(SimpleScheduleBuilder.repeatSecondlyForever(5)).build();//定义一个任务调度的Trigger 设置工作名称与组名 每天的24:00触发一次//Trigger trigger = TriggerBuilder.newTrigger().withIdentity("trigger1","group1").withSchedule(CronScheduleBuilder.cronSchedule("0 0 0 * * ?")).build();//设置工作 与触发器scheduler.scheduleJob(job, trigger);// and start it off//开始定时任务scheduler.start();

CornTrigger表达式的写法
* * * * * *
分别代表秒、分、时、日、月、周
例子：
0 0 12 ? * 3 每周二中午 12 点执行任务
0 0 0 0 * ? 每月 1 日 0 点执行任务
测试结果

Quartz与spring的整合

导入Quartz和Spring的Maven依赖

<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><dependency><groupId>org.slf4j</groupId><artifactId>slf4j-log4j12</artifactId><version>1.7.12</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>4.1.7.RELEASE</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-context-support</artifactId><version>4.1.7.RELEASE</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-web</artifactId><version>4.1.7.RELEASE</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-tx</artifactId><version>4.1.7.RELEASE</version></dependency>

配置ApplicationContext文件

 	<!-- 扫描包 --><context:component-scan base-package="包名"></context:component-scan><!-- job --><bean id="helloJob" class="org.springframework.scheduling.quartz.JobDetailFactoryBean"><property name="jobClass" value="cn.lzh.quartz.job.HelloJob"></property></bean><!-- trigger --><bean id="simpleTriger" class="org.springframework.scheduling.quartz.SimpleTriggerFactoryBean"><property name="jobDetail" ref="helloJob"></property><!-- 三秒后执行 --><property name="startDelay" value="3000"></property><!-- 五秒重复执行一次 --><property name="repeatInterval" value="5000"></property></bean><!-- scheduler  --><bean class="org.springframework.scheduling.quartz.SchedulerFactoryBean">
<!--  		<property name="jobFactory" ref="jobFactory" ></property>--> 		<property name="triggers"><list><ref bean="simpleTriger"/></list></property></bean>

Job对象

public class HelloJob implements Job {/*@Autowiredprivate HelloService helloService;*/@Overridepublic void execute(JobExecutionContext context) throws JobExecutionException {
/*		helloService.sayHello();
*/		System.out.println("hello,job Spring");}
}

Quartz与spring整合Bean无法注入的问题
当Quartz要注入Spring Bean对象时，会报错，因为Job对象不是Spring进行管理的，当job对象中注入Spring Bean会产生空指针异常 即无法注入

解决办法: 写一个JobFactory ，在ApplicationContext 中配置jobFactory，由JobFactory生成job时候，自动注入Spring Bean对象

JobFactory

@Service("jobFactory")
public class JobFactory extends AdaptableJobFactory {@Autowiredprivate AutowireCapableBeanFactory capableBeanFactory;@Overrideprotected Object createJobInstance(TriggerFiredBundle bundle)throws Exception {Object jobInstance = super.createJobInstance(bundle);capableBeanFactory.autowireBean(jobInstance);return jobInstance;}
}

在Secheduler中配置jobFactory

测试结果
运行maven项目的时候，自动开启Scheduler

测试成功