/////轉載: http://mengqingyu.iteye.com/blog/389275
轉: http://linqincai.iteye.com/?show_full=true
是由客戶制定生成的,服務端只知道該去執行什麼任務,但任務的定時是不確定的(是由客戶制定)。這樣總不能修改配置文件每定製個定時任務就增加一個trigger吧,即便允許客戶修改配置文件,但總需要重新啓動web服務啊,研究了下Quartz在Spring中的動態定時,發現: cronExpression是關鍵,如果可以動態設置cronExpression的值,也就說如果我們可以直接調用CronTriggerBean中設置cronExpression的方法,就可以順利解決問題了。
① targetMethod: 指定需要定時執行scheduleInfoManager中的simpleJobTest()方法
② concurrent:對於相同的JobDetail,當指定多個Trigger時, 很可能第一個job完成之前,第二個job就開始了。指定concurrent設爲false,多個job不會併發運行,第二個job將不會在第一個job完成之前開始。
③ cronExpression:0/10 * * * * ?表示每10秒執行一次,具體可參考附表。
④ triggers:通過再添加其他的ref元素可在list中放置多個觸發器。scheduleInfoManager中的simpleJobTest()方法注意:此方法沒有參數,如果scheduleInfoManager有兩個方法simpleJobTest()和simpleJobTest(String argument),則spring只會去執行無參的simpleJobTest().
public void simpleJobTest()
{
log.warn("uh oh, Job is scheduled !'" + "' Success...");
}
Quartz在Spring中動態設置cronTrigger方法一Spring配置文件:
將定時器注入到業務邏輯層Manager
/////
Xml代碼
- <bean id="scheduleInfoManager" class="com.lively.happyoa.jobs.webapp.manager.scheduleInfoManager">
- <property name="scheduler" ref="schedulerFactory"/>
- </bean>
- <bean id="schedulerJobDetail" class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean">
- <property name="targetObject" ref="scheduleInfoManager"/>
- <property name="targetMethod" value="reScheduleJob"/>
- <property name="concurrent" value="false"/>
- </bean>
- <bean id="cronTrigger" class="org.springframework.scheduling.quartz.CronTriggerBean" >
- <property name="jobDetail" ref="schedulerJobDetail"/>
- <property name="cronExpression">
- <value>0/10 * * * * ?</value>
- </property>
- </bean>
- <bean id="schedulerFactory" class="org.springframework.scheduling.quartz.SchedulerFactoryBean">
- <property name="triggers">
- <list>
- <ref local="cronTrigger"/>
- </list>
- </property>
- </bean>
/////
Xml代碼
- <bean id="scheduleInfoManager" class="com.lively.happyoa.jobs.webapp.manager.scheduleInfoManager">
- <property name="scheduler" ref="schedulerFactory"/>
- </bean>
- <bean id="schedulerJobDetail" class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean">
- <property name="targetObject" ref="scheduleInfoManager"/>
- <property name="targetMethod" value="reScheduleJob"/>
- <property name="concurrent" value="false"/>
- </bean>
- <bean id="cronTrigger" class="org.springframework.scheduling.quartz.CronTriggerBean" >
- <property name="jobDetail" ref="schedulerJobDetail"/>
- <property name="cronExpression">
- <value>0/10 * * * * ?</value>
- </property>
- </bean>
- <bean id="schedulerFactory" class="org.springframework.scheduling.quartz.SchedulerFactoryBean">
- <property name="triggers">
- <list>
- <ref local="cronTrigger"/>
- </list>
- </property>
- </bean>
// scheduleInfoManager中的reScheduleJob ()方法及相關方法① reScheduleJob讀取數據庫,獲得自定義定時器調度時間():
Java代碼
- private Scheduler scheduler;
- // 設值注入,通過setter方法傳入被調用者的實例scheduler
- public void setScheduler(Scheduler scheduler) {
- this.scheduler = scheduler;
- }
- rivate void reScheduleJob() throws SchedulerException,ParseException {
- // 運行時可通過動態注入的scheduler得到trigger,注意採用這種注入方式在有的項目中會有問題,如果遇到注入問題,可以採取在運行方法時候,獲得bean來避免錯誤發生。
- CronTriggerBean trigger = (CronTriggerBean) scheduler.getTrigger( "cronTrigger", Scheduler.DEFAULT_GROUP);
- String dbCronExpression = getCronExpressionFromDB();
- String originConExpression = trigger.getCronExpression();
- // 判斷從DB中取得的任務時間(dbCronExpression)和現在的quartz線程中的任務時間(originConExpression)是否相等
- // 如果相等,則表示用戶並沒有重新設定數據庫中的任務時間,這種情況不需要重新rescheduleJob
- if(!originConExpression.equalsIgnoreCase(dbCronExpression)){
- trigger.setCronExpression(dbCronExpression);
- scheduler.rescheduleJob("cronTrigger", Scheduler.DEFAULT_GROUP, trigger);
- }
- // 下面是具體的job內容,可自行設置
- // executeJobDetail();}
- private Scheduler scheduler;
- // 設值注入,通過setter方法傳入被調用者的實例scheduler
- public void setScheduler(Scheduler scheduler) {
- this.scheduler = scheduler;
- }
- rivate void reScheduleJob() throws SchedulerException,ParseException {
- // 運行時可通過動態注入的scheduler得到trigger,注意採用這種注入方式在有的項目中會有問題,如果遇到注入問題,可以採取在運行方法時候,獲得bean來避免錯誤發生。
- CronTriggerBean trigger = (CronTriggerBean) scheduler.getTrigger( "cronTrigger", Scheduler.DEFAULT_GROUP);
- String dbCronExpression = getCronExpressionFromDB();
- String originConExpression = trigger.getCronExpression();
- // 判斷從DB中取得的任務時間(dbCronExpression)和現在的quartz線程中的任務時間(originConExpression)是否相等
- // 如果相等,則表示用戶並沒有重新設定數據庫中的任務時間,這種情況不需要重新rescheduleJob
- if(!originConExpression.equalsIgnoreCase(dbCronExpression)){
- trigger.setCronExpression(dbCronExpression);
- scheduler.rescheduleJob("cronTrigger", Scheduler.DEFAULT_GROUP, trigger);
- }
- // 下面是具體的job內容,可自行設置
- // executeJobDetail();}
② getCronExpressionFromDB():從數據庫中獲得dbCronExpression的具體代碼,由於使用了scheduleInfoManager,所以要在定義相應的setter方法:
Java代碼
- private String getCronExpressionFromDB(){
- String sql="from ScheduleInfo scheduleInfo where 1=1 ";
- sql=sql+" and scheduleInfo.infoId = '"+"1" + "'";
- List scheduleList = scheduleInfoManager.queryScheduleInListBySql(sql);
- ScheduleInfo scheduleInfo = (ScheduleInfo)scheduleList.get(0);
- String dbCronExpression = scheduleInfo.getCronExpression();
- return dbCronExpression;
- }
- private String getCronExpressionFromDB(){
- String sql="from ScheduleInfo scheduleInfo where 1=1 ";
- sql=sql+" and scheduleInfo.infoId = '"+"1" + "'";
- List scheduleList = scheduleInfoManager.queryScheduleInListBySql(sql);
- ScheduleInfo scheduleInfo = (ScheduleInfo)scheduleList.get(0);
- String dbCronExpression = scheduleInfo.getCronExpression();
- return dbCronExpression;
- }
③ 在spring配置文件的scheduleInfoManager配置了相應的property(scheduler/
- scheduleInfoManager),要爲其設置setter方法:
- private Scheduler scheduler;
- // 設值注入,通過setter方法傳入被調用者的實例scheduler
- public void setScheduler(Scheduler scheduler) {
- this.scheduler = scheduler;
- }
- private ScheduleInfoManager scheduleInfoManager;
- // 設值注入,通過setter方法傳入被調用者的實例scheduleInfoManager
- public void setScheduleInfoManager(ScheduleInfoManager scheduleInfoManager){
- this.scheduleInfoManager = scheduleInfoManager;
- }
- scheduleInfoManager),要爲其設置setter方法:
- private Scheduler scheduler;
- // 設值注入,通過setter方法傳入被調用者的實例scheduler
- public void setScheduler(Scheduler scheduler) {
- this.scheduler = scheduler;
- }
- private ScheduleInfoManager scheduleInfoManager;
- // 設值注入,通過setter方法傳入被調用者的實例scheduleInfoManager
- public void setScheduleInfoManager(ScheduleInfoManager scheduleInfoManager){
- this.scheduleInfoManager = scheduleInfoManager;
- }
Quartz在Spring中動態設置cronTrigger方法二在上面的2中我們可以看到,儘管已經可以動態進行rescheduleJob了,不過依然需要我們設置一個cronExpression,如果嘗試一下拿掉spring配置中的
<property name="cronExpression">
<value>0/10 * * * * ?</value>
</property>
則容器(如tomcat)啓動時會報錯。實際中我們希望tomcat啓動時就可以直接去讀數據庫,拿到相應的dbCronExpression,然後定時執行一個job,而不希望配置初始的cronExpression ,觀察下面的CronTriggerBean,考慮到cronExpression需要初始化,如果設定一個類InitializingCronTrigger繼承CronTriggerBean,然後在這個類中做一些讀取DB的初始化工作(設置cronExpression),問題就可以解決了。Spring配置文件:
- <bean id="scheduleInfoManager" class="com.lively.happyoa.jobs.webapp.manager.ScheduleInfoManager"> <property name="scheduler" ref="schedulerFactory"/>
- </bean>
- <bean id="schedulerJobDetail" class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean">
- <property name="targetObject" ref="scheduleInfoManager"/>
- <property name="targetMethod" value="reScheduleJob"/>
- <property name="concurrent" value="false"/>
- </bean>
- <bean id="cronTrigger" class="com.lively.happyoa.jobs.webapp.manager.ScheduleInfoManager.InitializingCronTrigger">
- <property name="jobDetail" ref="schedulerJobDetail"/>
- <!--<property name="cronExpression">
- <value>0/10 * * * * ?</value>
- </property>-->
- <property name="scheduleInfoManager" ref="scheduleInfoManager"/>
- </bean>
- <bean id="schedulerFactory" class="org.springframework.scheduling.quartz.SchedulerFactoryBean">
- <property name="triggers">
- <list>
- <ref local="cronTrigger"/>
- </list>
- </property>
- </bean>
- <bean id="scheduleInfoManager" class="com.lively.happyoa.jobs.webapp.manager.ScheduleInfoManager"> <property name="scheduler" ref="schedulerFactory"/>
- </bean>
- <bean id="schedulerJobDetail" class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean">
- <property name="targetObject" ref="scheduleInfoManager"/>
- <property name="targetMethod" value="reScheduleJob"/>
- <property name="concurrent" value="false"/>
- </bean>
- <bean id="cronTrigger" class="com.lively.happyoa.jobs.webapp.manager.ScheduleInfoManager.InitializingCronTrigger">
- <property name="jobDetail" ref="schedulerJobDetail"/>
- <!--<property name="cronExpression">
- <value>0/10 * * * * ?</value>
- </property>-->
- <property name="scheduleInfoManager" ref="scheduleInfoManager"/>
- </bean>
- <bean id="schedulerFactory" class="org.springframework.scheduling.quartz.SchedulerFactoryBean">
- <property name="triggers">
- <list>
- <ref local="cronTrigger"/>
- </list>
- </property>
- </bean>
InitializingCronTrigger中的相關方法注意:在注入scheduleInfoManager屬性的時候,我們可以去讀取DB任務時間(之所以放在setter方法中,是因爲需要在設置scheduleInfoManager後進行getCronExpressionFromDB(),否則,也可以①②邏輯把放在類的構造函數中).注意InitializingCronTrigger必須extends CronTriggerBean.
- public class InitializingCronTrigger extends CronTriggerBean implements Serializable {
- private ScheduleInfoManager scheduleInfoManager;
- // 設值注入,通過setter方法傳入被調用者的實例scheduleInfoManager
- public void setScheduleInfoManager(ScheduleInfoManager scheduleInfoManager){
- this.scheduleInfoManager = scheduleInfoManager;
- // 因爲在getCronExpressionFromDB使用到了scheduleInfoManager,所以
- // 必須上一行代碼設置scheduleInfoManager後進行
- getCronExpressionFromDB
- String cronExpression = getCronExpressionFromDB ();
- // ①
- // 因爲extends CronTriggerBean ,此處調用父類方法初始化cronExpression
- setCronExpression(cronExpression);
- // ②}
- private String getCronExpressionFromDB(){
- String sql="from ScheduleInfo scheduleInfo where
- 1=1 ";
- sql=sql+" and scheduleInfo.infoId = '"+"1" + "'";
- List scheduleList = scheduleInfoManager.queryScheduleInListBySql(sql);
- ScheduleInfo scheduleInfo = (ScheduleInfo)scheduleList.get(0);
- String dbCronExpression = scheduleInfo.getCronExpression();
- return dbCronExpression;}……}
- public class InitializingCronTrigger extends CronTriggerBean implements Serializable {
- private ScheduleInfoManager scheduleInfoManager;
- // 設值注入,通過setter方法傳入被調用者的實例scheduleInfoManager
- public void setScheduleInfoManager(ScheduleInfoManager scheduleInfoManager){
- this.scheduleInfoManager = scheduleInfoManager;
- // 因爲在getCronExpressionFromDB使用到了scheduleInfoManager,所以
- // 必須上一行代碼設置scheduleInfoManager後進行
- getCronExpressionFromDB
- String cronExpression = getCronExpressionFromDB ();
- // ①
- // 因爲extends CronTriggerBean ,此處調用父類方法初始化cronExpression
- setCronExpression(cronExpression);
- // ②}
- private String getCronExpressionFromDB(){
- String sql="from ScheduleInfo scheduleInfo where
- 1=1 ";
- sql=sql+" and scheduleInfo.infoId = '"+"1" + "'";
- List scheduleList = scheduleInfoManager.queryScheduleInListBySql(sql);
- ScheduleInfo scheduleInfo = (ScheduleInfo)scheduleList.get(0);
- String dbCronExpression = scheduleInfo.getCronExpression();
- return dbCronExpression;}……}