spring动态定时器

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本文介绍如何在Spring Boot应用中改进定时任务配置，实现动态调度功能，包括使用初始化CronTriggerBean处理定时任务的触发时机和更新任务执行时间。

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在网上看了http://www.blogjava.net/xiaodaoxiaodao/archive/2007/02/05/103437.html 之类的文章，像留言说的一样报错。本文通过改进，在程序里面获取Scheduler。

配置文件：

<bean id="schedulerFactory"
		class="org.springframework.scheduling.quartz.SchedulerFactoryBean">
		<property name="triggers">
			<list>
				<ref bean="popupWindowTrigger"/>
			</list>
		</property>
	</bean> 
     <bean id="popupWindowTrigger" class="xxx.util.InitializingCronTriggerBean">
         <property name="jobDetail">
			<ref bean="popupWindowDetail" />
		</property>
		<property name="popupWindowManager"><ref bean="popupWindowManager" /></property>	
     </bean>
     <bean id="popupWindowDetail" class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean">
        <property name="targetObject">
			<ref bean="popupWindowTimerTask" />
		</property>
        <property name="targetMethod"><value>execute</value></property>
        <property name="concurrent"><value>false</value></property>
    </bean>
    <bean id="popupWindowTimerTask" class="xxx.action.PopupWindowTimerTask">
		<property name="popupWindowManager" ref="popupWindowManager"/> 
    </bean>

InitializingCronTriggerBean类继承了CronTriggerBean类。由于我需要在触发定时器时，处理一些内容，因此添加了额外的属性TagList。

public class InitializingCronTriggerBean extends CronTriggerBean{
	protected final  Log log = LogFactory.getLog(InitializingCronTriggerBean.class);
	PopupWindowManager popupWindowManager;
	TagList tagList;

	public PopupWindowManager getPopupWindowManager() {
		return popupWindowManager;
	}

	public void setPopupWindowManager(PopupWindowManager popupWindowManager) throws ParseException {
		this.popupWindowManager = popupWindowManager;
		updateCronExpression();
	}
	public void updateCronExpression() throws ParseException{
		tagList= popupWindowManager.getCronExpressionFromDB (); 
		String cronExpression=null;
		if(tagList!=null){
			Date updateTime=tagList.getUpdateTime();
			Calendar calendar=GregorianCalendar.getInstance(); 
			calendar.setTime(updateTime);
			cronExpression=calendar.get(Calendar.SECOND)+" "+calendar.get(Calendar.MINUTE)+" "+calendar.get(Calendar.HOUR_OF_DAY)+" "+calendar.get(Calendar.DATE)+" "+(calendar.get(Calendar.MONTH)+1)+" ? "+calendar.get(Calendar.YEAR);
		}
		if(cronExpression==null)
			cronExpression="0/10 * * ? * *"; 
		setCronExpression(cronExpression);
		log.info("时间为:"+cronExpression);
	}
	public TagList getTagList() {
		return tagList;
	}

	public void setTagList(TagList tagList) {
		this.tagList = tagList;
	}
	
}

PopupWindowTimerTask 类是触发后的处理类，实现了ApplicationContextAware接口用来捕获ApplicationContext对象

public class PopupWindowTimerTask implements ApplicationContextAware{
	protected final  Log log = LogFactory.getLog(HTML5TimerTask.class);
	PopupWindowManager popupWindowManager;
	Scheduler scheduler;
	ApplicationContext ctx;
	public String execute() throws Exception{
		log.info("执行定时任务,执行时间="+DateUtils.getDateTime("yyyy-MM-dd HH:mm:ss")+"　任务功能：小弹窗！");
		try{
			scheduler = (Scheduler) ctx.getBean("schedulerFactory");
			InitializingCronTriggerBean trigger = (InitializingCronTriggerBean) scheduler.getTrigger("popupWindowTrigger", Scheduler.DEFAULT_GROUP);
			TagList tl=trigger.getTagList();
			//要处理的业务逻辑
			
			///////////////////////////
			trigger.updateCronExpression();
			scheduler.rescheduleJob("popupWindowTrigger", Scheduler.DEFAULT_GROUP, trigger);
		}catch(Exception e){
			log.error("获取配置表中频道信息出错",e);
		}
		log.info("定时任务完成,完成时间="+DateUtils.getDateTime("yyyy-MM-dd HH:mm:ss")+"　任务功能：小弹窗！");
		return "success";
	}

	public PopupWindowManager getPopupWindowManager() {
		return popupWindowManager;
	}
	public void setPopupWindowManager(PopupWindowManager popupWindowManager) {
		this.popupWindowManager = popupWindowManager;
	}
	public Scheduler getScheduler() {
		return scheduler;
	}
	public void setScheduler(Scheduler scheduler) {
		this.scheduler = scheduler;
	}
	@Override
	public void setApplicationContext(ApplicationContext arg0)
			throws BeansException {
		// TODO Auto-generated method stub
		this.ctx=arg0;
	}
}

这样当数据库里面没有动态定时任务时，每隔10秒钟扫描一次。当动态定时任务触发后，自动更新下一次任务的时间。

重点是在触发以后的类里面，获取scheduler。