spring動態定時器

在網上看了http://www.blogjava.net/xiaodaoxiaodao/archive/2007/02/05/103437.html 之類的文章，像留言說的一樣報錯。本文通過改進，在程式裡面擷取Scheduler。

設定檔：

<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類繼承了CronTriggerBean類。由於我需要在觸發定時器時，處理一些內容，因此添加了額外的屬性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("時間為:"+cronExpression);}public TagList getTagList() {return tagList;}public void setTagList(TagList tagList) {this.tagList = tagList;}}

PopupWindowTimerTask 類是觸發後的處理類，實現了ApplicationContextAware介面用來捕獲ApplicationContext對象

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("執行定時任務,執行時間="+DateUtils.getDateTime("yyyy-MM-dd HH:mm:ss")+"　任務功能：影音小彈窗！");try{scheduler = (Scheduler) ctx.getBean("schedulerFactory");InitializingCronTriggerBean trigger = (InitializingCronTriggerBean) scheduler.getTrigger("popupWindowTrigger", Scheduler.DEFAULT_GROUP);TagList tl=trigger.getTagList();//要處理的商務邏輯///////////////////////////trigger.updateCronExpression();scheduler.rescheduleJob("popupWindowTrigger", Scheduler.DEFAULT_GROUP, trigger);}catch(Exception e){log.error("擷取配置表中頻道資訊出錯",e);}log.info("定時任務完成,完成時間="+DateUtils.getDateTime("yyyy-MM-dd HH:mm:ss")+"　任務功能：影音小彈窗！");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;}@Overridepublic void setApplicationContext(ApplicationContext arg0)throws BeansException {// TODO Auto-generated method stubthis.ctx=arg0;}}

這樣當資料庫裡面沒有動態定時任務時，每隔10秒鐘掃描一次。當動態定時任務觸發後，自動更新下一次任務的時間。

重點是在觸發以後的類裡面，擷取scheduler。