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    什么是動(dòng)態(tài)定時(shí)任務(wù):是由客戶制定生成的,服務(wù)端只知道該去執(zhí)行什么任務(wù),但任務(wù)的定時(shí)是不確定的(是由客戶制定)。

    這樣總不能修改配置文件每定制個(gè)定時(shí)任務(wù)就增加一個(gè)trigger吧,即便允許客戶修改配置文件,但總需要重新啟動(dòng)web服務(wù)啊,研究了下Quartz在Spring中的動(dòng)態(tài)定時(shí),發(fā)現(xiàn)<bean id="cronTrigger" class="org.springframework.scheduling.quartz.CronTriggerBean" >

             <property name="jobDetail" ref="schedulerJobDetail"/>

             <property name="cronExpression">

                 <value>0/10 * * * * ?</value>

             </property>

          cronExpression是關(guān)鍵,如果可以動(dòng)態(tài)設(shè)置cronExpression的值,也就說(shuō)如果我們可以直接調(diào)用CronTriggerBean中設(shè)置cronExpression的方法,就可以順利解決問(wèn)題了。

    熟悉1的朋友可以跳過(guò)不看,下面2、3是動(dòng)態(tài)定時(shí)任務(wù)的具體實(shí)現(xiàn)。

    1. Quartz 在Spring中的簡(jiǎn)單配置

    Spring 配置文件:

        <bean id="schedulerJobDetail" class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean">

            <property name="targetObject" ref="scheduleInfoAction"/>

            <property name="targetMethod" value="simpleJobTest"/>

            <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>

    在上面的配置中設(shè)定了

    targetMethod: 指定需要定時(shí)執(zhí)行scheduleInfoAction中的simpleJobTest()方法

    ② concurrent:對(duì)于相同的JobDetail,當(dāng)指定多個(gè)Trigger時(shí), 很可能第一個(gè)job完成之前,第二個(gè)job就開(kāi)始了。指定concurrent設(shè)為false,多個(gè)job不會(huì)并發(fā)運(yùn)行,第二個(gè)job將不會(huì)在第一個(gè)job完成之前開(kāi)始。

    cronExpression:0/10 * * * * ?表示每10秒執(zhí)行一次,具體可參考附表。

    ④ triggers:通過(guò)再添加其他的ref元素可在list中放置多個(gè)觸發(fā)器。

    scheduleInfoAction 中的simpleJobTest()方法

    注意:此方法沒(méi)有參數(shù),如果scheduleInfoAction有兩個(gè)方法simpleJobTest()和simpleJobTest(String argument),則spring只會(huì)去執(zhí)行無(wú)參的simpleJobTest().

    public void simpleJobTest() { 

            log.warn("uh oh, Job is scheduled !'" + "' Success...");

        }

    2 .Quartz在Spring中動(dòng)態(tài)設(shè)置cronTrigger方法一

    Spring 配置文件:

    <bean id="scheduleInfoAction" class="com.lively.happyoa.jobs.webapp.action.ScheduleInfoAction">

            <property name="scheduler" ref="schedulerFactory"/>

            <property name="scheduleInfoManager" ref="scheduleInfoManager"/>

        </bean>

        <bean id="schedulerJobDetail" class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean">

            <property name="targetObject" ref="scheduleInfoAction"/>

            <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>

    scheduleInfoAction 中的reScheduleJob ()方法及相關(guān)方法

    reScheduleJob():讀取數(shù)據(jù)庫(kù),獲得自定義定時(shí)器調(diào)度時(shí)間

        private void reScheduleJob() throws SchedulerException, ParseException {

            // 運(yùn)行時(shí)可通過(guò)動(dòng)態(tài)注入的scheduler得到trigger

            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(wù)時(shí)間(dbCronExpression)和現(xiàn)在的quartz線程中的任務(wù)時(shí)間(originConExpression)是否相等

        // 如果相等,則表示用戶并沒(méi)有重新設(shè)定數(shù)據(jù)庫(kù)中的任務(wù)時(shí)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(nèi)容,可自行設(shè)置

        // executeJobDetail();

    }

    getCronExpressionFromDB():從數(shù)據(jù)庫(kù)中獲得dbCronExpression的具體代碼,由于使用了scheduleInfoManager,所以要在定義相應(yīng)的setter方法

        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scheduleInfoAction配置了相應(yīng)的property(scheduler/scheduleInfoManager),要為其設(shè)置setter方法

        private Scheduler scheduler;

        // 設(shè)值注入,通過(guò)setter方法傳入被調(diào)用者的實(shí)例scheduler

        public void setScheduler(Scheduler scheduler) {

            this.scheduler = scheduler;

         }

        private ScheduleInfoManager scheduleInfoManager;

        // 設(shè)值注入,通過(guò)setter方法傳入被調(diào)用者的實(shí)例scheduleInfoManager

        public void setScheduleInfoManager(ScheduleInfoManager scheduleInfoManager){

            this.scheduleInfoManager = scheduleInfoManager;

        }

    3. Quartz 在Spring中動(dòng)態(tài)設(shè)置cronTrigger方法二

    在上面的2中我們可以看到,盡管 已經(jīng)可以動(dòng)態(tài)進(jìn)行 rescheduleJob 了,不過(guò)依然需要我們?cè)O(shè)置一個(gè) 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)啟動(dòng)時(shí)會(huì)報(bào)錯(cuò)。

    實(shí)際中我們希望tomcat啟動(dòng)時(shí)就可以直接去讀數(shù)據(jù)庫(kù),拿到相應(yīng)的 dbCronExpression ,然后定時(shí)執(zhí)行一個(gè)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(shè)定一個(gè)類InitializingCronTrigger繼承CronTriggerBean,然后在這個(gè)類中做一些讀取DB的初始化工作(設(shè)置cronExpression),問(wèn)題就可以解決了。

    Spring 配置文件:

    <bean id="scheduleInfoAction" class="com.lively.happyoa.jobs.webapp.action.ScheduleInfoAction">

            <property name="scheduler" ref="schedulerFactory"/>

            <property name="scheduleInfoManager" ref="scheduleInfoManager"/>

        </bean>

        <bean id="schedulerJobDetail" class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean">

            <property name="targetObject" ref="scheduleInfoAction"/>

            <property name="targetMethod" value="reScheduleJob"/>

            <property name="concurrent" value="false"/>

        </bean>

         <bean id="cronTrigger" class="com.lively.happyoa.jobs.webapp.action.ScheduleInfoAction.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(guān)方法

    注意:在注入scheduleInfoManager屬性的時(shí)候,我們可以去讀取DB任務(wù)時(shí)間(之所以放在setter方法中,是因?yàn)樾枰谠O(shè)置scheduleInfoManager后進(jìn)行getCronExpressionFromDB(),否則,也可以①②邏輯把放在類的構(gòu)造函數(shù)中).

    注意InitializingCronTrigger必須extendsCronTriggerBean.

    public class InitializingCronTrigger extendsCronTriggerBean implements Serializable {

        private ScheduleInfoManager scheduleInfoManager;

        // 設(shè)值注入,通過(guò)setter方法傳入被調(diào)用者的實(shí)例scheduleInfoManager

        public void setScheduleInfoManager(ScheduleInfoManager scheduleInfoManager){

            this.scheduleInfoManager = scheduleInfoManager;

            // 因?yàn)樵?span style="background: silver">getCronExpressionFromDB使用到了scheduleInfoManager,所以

            // 必須上一行代碼設(shè)置scheduleInfoManager后進(jìn)行getCronExpressionFromDB

            String cronExpression = getCronExpressionFromDB ();   //

            // 因?yàn)?span style="color: fuchsia">extendsCronTriggerBean ,此處調(diào)用父類方法初始化cronExpression

            setCronExpression (cronExpression);                    //

    }

        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;

     }

    ……

    }

    附表 CronTrigger Expression( 來(lái)自http://quartz.sourceforge.net/javadoc/org/quartz/CronTrigger.html)

    Expression

    Meaning

    "0 0 12 * * ?"

    Fire at 12pm (noon) every day

    "0 15 10 ? * *"

    Fire at 10:15am every day

    "0 15 10 * * ?"

    Fire at 10:15am every day

    "0 15 10 * * ? *"

    Fire at 10:15am every day

    "0 15 10 * * ? 2005"

    Fire at 10:15am every day during the year 2005

    "0 * 14 * * ?"

    Fire every minute starting at 2pm and ending at 2:59pm, every day

    "0 0/5 14 * * ?"

    Fire every 5 minutes starting at 2pm and ending at 2:55pm, every day

    "0 0/5 14,18 * * ?"

    Fire every 5 minutes starting at 2pm and ending at 2:55pm, AND fire every 5 minutes starting at 6pm and ending at 6:55pm, every day

    "0 0-5 14 * * ?"

    Fire every minute starting at 2pm and ending at 2:05pm, every day

    "0 10,44 14 ? 3 WED"

    Fire at 2:10pm and at 2:44pm every Wednesday in the month of March.

    "0 15 10 ? * MON-FRI"

    Fire at 10:15am every Monday, Tuesday, Wednesday, Thursday and Friday

    "0 15 10 15 * ?"

    Fire at 10:15am on the 15th day of every month

    "0 15 10 L * ?"

    Fire at 10:15am on the last day of every month

    "0 15 10 ? * 6L"

    Fire at 10:15am on the last Friday of every month

    "0 15 10 ? * 6L"

    Fire at 10:15am on the last Friday of every month

    "0 15 10 ? * 6L 2002-2005"

    Fire at 10:15am on every last friday of every month during the years 2002, 2003, 2004 and 2005

    "0 15 10 ? * 6#3"

    Fire at 10:15am on the third Friday of every month

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