Quartz动态配置表达的方法
在项目中有一个需求,需要灵活配置调度任务时间,并能自由启动或停止调度。
有关调度的实现我就第一就想到了Quartz这个开源调度组件,因为很多项目使用过,Spring结合Quartz静态配置调度任务时间,非常easy。比如:每天凌晨几点定时运行一个程序,这只要在工程中的spring配置文件中配置好spring整合quartz的几个属性就好。
Spring配置文件
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<bean id="jobDetail" class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean">
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<property name="targetObject" ref="simpleService" />
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<property name="targetMethod" value="test" />
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</bean>
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<bean id="cronTrigger" class="org.springframework.scheduling.quartz.CronTriggerFactoryBean">
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<property name="jobDetail" ref="jobDetail" />
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<property name="cronExpression" value="0 0/50 * ? * * *" />
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</bean>
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<bean id="schedulerTrigger" class="org.springframework.scheduling.quartz.SchedulerFactoryBean">
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<property name="triggers">
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<list>
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<ref bean="cronTrigger"/>
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</list>
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</property>
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</bean>
这种配置就是对quartz的一种简单的使用了,调度任务会在spring启动的时候加载到内存中,按照cronTrigger中定义的 cronExpression定义的时间按时触发调度任务。但是这是quartz使用"内存"方式的一种配置,也比较常见,当然对于不使用spring的项目,也可以单独整合quartz。方法也比较简单,可以从quartz的doc中找到配置方式,或者看一下《Quartz Job Scheduling Framework 》。
但是对于想持久化调度任务的状态,并且灵活调整调度时间的方式来说,上面的内存方式就不能满足要求了,正如本文开始我遇到的情况,需要采用数据库方式集成 Quartz,这部分集成其实在《Quartz Job Scheduling Framework 》中也有较为详细的介绍,当然doc文档中也有,但是缺乏和spring集成的实例。
一、需要构建Quartz数据库表,建表脚本在Quartz发行包的docs\dbTables目录,里面有各种数据库建表脚本,例子中采用的Quartz 2.2.1版本,使用H2内存数据库,执行了Quartz发行包的docs\dbTables\tables_h2.sql建表。
二、建立Maven project,完成后目录如下
三、配置applicationContext.xml文件
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<?xml version="1.0" encoding="UTF-8"?>
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<beans xmlns="http://www.springframework.org/schema/beans"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:jdbc="http://www.springframework.org/schema/jdbc"
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xmlns:context="http://www.springframework.org/schema/context"
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xsi:schemaLocation="
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http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
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http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc.xsd
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http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
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">
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<context:component-scan base-package="com.sundoctor" />
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<!-- 使用H2内存数据库并创建quartz数据库表 -->
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<jdbc:embedded-database id="dataSource" type="H2">
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<jdbc:script location="classpath:db/tables_h2.sql"/>
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</jdbc:embedded-database>
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</beans>
这里只是配置了数据库连接dataSource,为了简单方便,我使用H2内存数据库,执行tables_h2.sql创建quartz数据库表,还没有涉及到quartz有关配置,下面且听我慢慢道来。
四、实现动态定时任务
什么是动态定时任务:是由客户制定生成的,服务端只知道该去执行什么任务,但任务的定时是不确定的(是由客户制定)。
这样总不能修改配置文件每定制个定时任务就增加一个trigger吧,即便允许客户修改配置文件,但总需要重新启动web服务啊,研究了下Quartz在Spring中的动态定时,发现
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<bean id="cronTrigger" class="org.springframework.scheduling.quartz.CronTriggerFactoryBean">
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<property name="jobDetail" ref="jobDetail" />
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<property name="cronExpression" value="0 0/50 * ? * * *" />
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</bean>
中cronExpression是关键,如果可以动态设置cronExpression的值,就可以顺利解决问题了。这样我们就不能直接使用org.springframework.scheduling.quartz.CronTriggerFactoryBean,需要自己实现一个动态调度服务类,在其中构建CronTrigger或SimpleTrigger,动态配置时间。
动态调度服务接口:
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package com.sundoctor.quartz.service;
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import java.util.Date;
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import org.quartz.CronExpression;
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public interface SchedulerService {
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/**
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* 根据 Quartz Cron Expression 调试任务
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*
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* @param cronExpression
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* Quartz Cron 表达式,如 "0/10 * * ? * * *"等
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*/
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void schedule(String cronExpression);
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/**
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* 根据 Quartz Cron Expression 调试任务
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*
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* @param name
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* Quartz CronTrigger名称
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* @param cronExpression
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* Quartz Cron 表达式,如 "0/10 * * ? * * *"等
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*/
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void schedule(String name, String cronExpression);
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/**
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* 根据 Quartz Cron Expression 调试任务
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*
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* @param name
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* Quartz CronTrigger名称
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* @param group
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* Quartz CronTrigger组
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* @param cronExpression
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* Quartz Cron 表达式,如 "0/10 * * ? * * *"等
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*/
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void schedule(String name, String group, String cronExpression);
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/**
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* 根据 Quartz Cron Expression 调试任务
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*
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* @param cronExpression
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* Quartz CronExpression
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*/
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void schedule(CronExpression cronExpression);
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/**
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* 根据 Quartz Cron Expression 调试任务
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*
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* @param name
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* Quartz CronTrigger名称
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* @param cronExpression
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* Quartz CronExpression
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*/
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void schedule(String name, CronExpression cronExpression);
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/**
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* 根据 Quartz Cron Expression 调试任务
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*
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* @param name
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* Quartz CronTrigger名称
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* @param group
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* Quartz CronTrigger组
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* @param cronExpression
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* Quartz CronExpression
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*/
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void schedule(String name, String group, CronExpression cronExpression);
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/**
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* 在startTime时执行调试一次
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*
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* @param startTime
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* 调度开始时间
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*/
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void schedule(Date startTime);
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void schedule(Date startTime, String group);
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/**
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* 在startTime时执行调试一次
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*
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* @param name
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* Quartz SimpleTrigger 名称
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* @param startTime
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* 调度开始时间
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*/
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void schedule(String name, Date startTime);
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void schedule(String name, Date startTime, String group);
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/**
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* 在startTime时执行调试,endTime结束执行调度
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*
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* @param startTime
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* 调度开始时间
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* @param endTime
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* 调度结束时间
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*/
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void schedule(Date startTime, Date endTime);
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void schedule(Date startTime, Date endTime, String group);
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/**
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* 在startTime时执行调试,endTime结束执行调度
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*
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* @param name
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* Quartz SimpleTrigger 名称
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* @param startTime
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* 调度开始时间
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* @param endTime
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* 调度结束时间
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*/
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void schedule(String name, Date startTime, Date endTime);
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void schedule(String name, Date startTime, Date endTime, String group);
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/**
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* 在startTime时执行调试,endTime结束执行调度,重复执行repeatCount次
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*
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* @param startTime
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* 调度开始时间
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* @param repeatCount
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* 重复执行次数
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*/
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void schedule(Date startTime, int repeatCount);
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/**
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* 在startTime时执行调试,endTime结束执行调度,重复执行repeatCount次
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*
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* @param startTime
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* 调度开始时间
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* @param endTime
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* 调度结束时间
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* @param repeatCount
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* 重复执行次数
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*/
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void schedule(Date startTime, Date endTime, int repeatCount);
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void schedule(Date startTime, Date endTime, int repeatCount, String group);
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/**
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* 在startTime时执行调试,endTime结束执行调度,重复执行repeatCount次
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*
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* @param name
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* Quartz SimpleTrigger 名称
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* @param startTime
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* 调度开始时间
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* @param endTime
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* 调度结束时间
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* @param repeatCount
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* 重复执行次数
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*/
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void schedule(String name, Date startTime, Date endTime, int repeatCount);
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void schedule(String name, Date startTime, Date endTime, int repeatCount, String group);
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/**
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* 在startTime时执行调试,endTime结束执行调度,重复执行repeatCount次,每隔repeatInterval秒执行一次
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*
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* @param startTime
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* 调度开始时间
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*
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* @param repeatCount
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* 重复执行次数
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* @param repeatInterval
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* 执行时间隔间
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*/
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void schedule(Date startTime, int repeatCount, long repeatInterval);
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/**
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* 在startTime时执行调试,endTime结束执行调度,重复执行repeatCount次,每隔repeatInterval秒执行一次
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*
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* @param startTime
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* 调度开始时间
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* @param endTime
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* 调度结束时间
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* @param repeatCount
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* 重复执行次数
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* @param repeatInterval
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* 执行时间隔间
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*/
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void schedule(Date startTime, Date endTime, int repeatCount, long repeatInterval);
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void schedule(Date startTime, Date endTime, int repeatCount, long repeatInterval, String group);
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/**
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* 在startTime时执行调试,endTime结束执行调度,重复执行repeatCount次,每隔repeatInterval秒执行一次
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*
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* @param name
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* Quartz SimpleTrigger 名称
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* @param startTime
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* 调度开始时间
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* @param endTime
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* 调度结束时间
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* @param repeatCount
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* 重复执行次数
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* @param repeatInterval
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* 执行时间隔间
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*/
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void schedule(String name, Date startTime, Date endTime, int repeatCount, long repeatInterval);
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void schedule(String name, Date startTime, Date endTime, int repeatCount, long repeatInterval, String group);
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/**
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* 暂停触发器
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*
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* @param triggerName
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* 触发器名称
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*/
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void pauseTrigger(String triggerName);
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/**
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* 暂停触发器
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*
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* @param triggerName
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* 触发器名称
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* @param group
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* 触发器组
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*/
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void pauseTrigger(String triggerName, String group);
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/**
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* 恢复触发器
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*
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* @param triggerName
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* 触发器名称
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*/
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void resumeTrigger(String triggerName);
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/**
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* 恢复触发器
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*
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* @param triggerName
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* 触发器名称
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* @param group
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* 触发器组
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*/
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void resumeTrigger(String triggerName, String group);
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/**
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* 删除触发器
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*
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* @param triggerName
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* 触发器名称
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* @return
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*/
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boolean removeTrigdger(String triggerName);
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/**
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* 删除触发器
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*
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* @param triggerName
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* 触发器名称
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* @param group
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* 触发器组
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* @return
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*/
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boolean removeTrigdger(String triggerName, String group);
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}
动态调度服务实现类:
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package com.sundoctor.quartz.service;
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import java.text.ParseException;
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import java.util.Date;
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import java.util.UUID;
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import org.quartz.CronExpression;
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import org.quartz.JobDetail;
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import org.quartz.Scheduler;
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import org.quartz.SchedulerException;
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import org.quartz.TriggerKey;
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import org.quartz.impl.triggers.CronTriggerImpl;
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import org.quartz.impl.triggers.SimpleTriggerImpl;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.stereotype.Service;
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@Service("schedulerService")
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public class SchedulerServiceImpl implements SchedulerService {
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private static final String NULLSTRING = null;
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private static final Date NULLDATE = null;
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@Autowired
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private Scheduler scheduler;
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@Autowired
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private JobDetail jobDetail;
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@Override
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public void schedule(String cronExpression) {
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schedule(NULLSTRING, cronExpression);
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}
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@Override
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public void schedule(String name, String cronExpression) {
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schedule(name, NULLSTRING, cronExpression);
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}
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@Override
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public void schedule(String name, String group, String cronExpression) {
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try {
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schedule(name, group, new CronExpression(cronExpression));
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} catch (ParseException e) {
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throw new IllegalArgumentException(e);
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}
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}
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@Override
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public void schedule(CronExpression cronExpression) {
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schedule(NULLSTRING, cronExpression);
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}
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@Override
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public void schedule(String name, CronExpression cronExpression) {
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schedule(name, NULLSTRING, cronExpression);
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}
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@Override
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public void schedule(String name, String group, CronExpression cronExpression) {
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if (isValidExpression(cronExpression)) {
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if (name == null || name.trim().equals("")) {
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name = UUID.randomUUID().toString();
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}
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CronTriggerImpl trigger = new CronTriggerImpl();
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trigger.setCronExpression(cronExpression);
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TriggerKey triggerKey = new TriggerKey(name, group);
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trigger.setJobName(jobDetail.getKey().getName());
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trigger.setKey(triggerKey);
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try {
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scheduler.addJob(jobDetail, true);
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if (scheduler.checkExists(triggerKey)) {
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scheduler.rescheduleJob(triggerKey, trigger);
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} else {
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scheduler.scheduleJob(trigger);
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}
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} catch (SchedulerException e) {
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throw new IllegalArgumentException(e);
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}
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}
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}
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@Override
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public void schedule(Date startTime) {
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schedule(startTime, NULLDATE);
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}
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@Override
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public void schedule(Date startTime, String group) {
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schedule(startTime, NULLDATE, group);
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}
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@Override
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public void schedule(String name, Date startTime) {
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schedule(name, startTime, NULLDATE);
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}
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@Override
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public void schedule(String name, Date startTime, String group) {
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schedule(name, startTime, NULLDATE, group);
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}
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@Override
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public void schedule(Date startTime, Date endTime) {
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schedule(startTime, endTime, 0);
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}
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@Override
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public void schedule(Date startTime, Date endTime, String group) {
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schedule(startTime, endTime, 0, group);
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}
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@Override
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public void schedule(String name, Date startTime, Date endTime) {
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schedule(name, startTime, endTime, 0);
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}
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@Override
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public void schedule(String name, Date startTime, Date endTime, String group) {
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schedule(name, startTime, endTime, 0, group);
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}
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@Override
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public void schedule(Date startTime, int repeatCount) {
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schedule(null, startTime, NULLDATE, 0);
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}
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@Override
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public void schedule(Date startTime, Date endTime, int repeatCount) {
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schedule(null, startTime, endTime, 0);
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}
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@Override
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public void schedule(Date startTime, Date endTime, int repeatCount, String group) {
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schedule(null, startTime, endTime, 0, group);
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}
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@Override
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public void schedule(String name, Date startTime, Date endTime, int repeatCount) {
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schedule(name, startTime, endTime, 0, 0L);
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}
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@Override
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public void schedule(String name, Date startTime, Date endTime, int repeatCount, String group) {
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schedule(name, startTime, endTime, 0, 0L, group);
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}
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@Override
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public void schedule(Date startTime, int repeatCount, long repeatInterval) {
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schedule(null, startTime, NULLDATE, repeatCount, repeatInterval);
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}
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@Override
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public void schedule(Date startTime, Date endTime, int repeatCount, long repeatInterval) {
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schedule(null, startTime, endTime, repeatCount, repeatInterval);
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}
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@Override
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public void schedule(Date startTime, Date endTime, int repeatCount, long repeatInterval, String group) {
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schedule(null, startTime, endTime, repeatCount, repeatInterval, group);
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}
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@Override
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public void schedule(String name, Date startTime, Date endTime, int repeatCount, long repeatInterval) {
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schedule(name, startTime, endTime, repeatCount, repeatInterval, NULLSTRING);
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}
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@Override
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public void schedule(String name, Date startTime, Date endTime, int repeatCount, long repeatInterval, String group) {
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if (this.isValidExpression(startTime)) {
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if (name == null || name.trim().equals("")) {
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name = UUID.randomUUID().toString();
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}
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TriggerKey triggerKey = new TriggerKey(name, group);
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SimpleTriggerImpl trigger = new SimpleTriggerImpl();
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trigger.setKey(triggerKey);
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trigger.setJobName(jobDetail.getKey().getName());
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trigger.setStartTime(startTime);
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trigger.setEndTime(endTime);
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trigger.setRepeatCount(repeatCount);
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trigger.setRepeatInterval(repeatInterval);
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try {
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scheduler.addJob(jobDetail, true);
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if (scheduler.checkExists(triggerKey)) {
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scheduler.rescheduleJob(triggerKey, trigger);
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} else {
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scheduler.scheduleJob(trigger);
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}
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} catch (SchedulerException e) {
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throw new IllegalArgumentException(e);
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}
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}
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}
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@Override
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public void pauseTrigger(String triggerName) {
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pauseTrigger(triggerName, NULLSTRING);
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}
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@Override
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public void pauseTrigger(String triggerName, String group) {
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try {
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scheduler.pauseTrigger(new TriggerKey(triggerName, group));// 停止触发器
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} catch (SchedulerException e) {
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throw new RuntimeException(e);
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}
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}
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@Override
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public void resumeTrigger(String triggerName) {
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resumeTrigger(triggerName, NULLSTRING);
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}
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@Override
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public void resumeTrigger(String triggerName, String group) {
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try {
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scheduler.resumeTrigger(new TriggerKey(triggerName, group));// 重启触发器
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} catch (SchedulerException e) {
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throw new RuntimeException(e);
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}
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}
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@Override
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public boolean removeTrigdger(String triggerName) {
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return removeTrigdger(triggerName, NULLSTRING);
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}
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@Override
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public boolean removeTrigdger(String triggerName, String group) {
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TriggerKey triggerKey = new TriggerKey(triggerName, group);
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try {
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scheduler.pauseTrigger(triggerKey);// 停止触发器
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return scheduler.unscheduleJob(triggerKey);// 移除触发器
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} catch (SchedulerException e) {
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throw new RuntimeException(e);
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}
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}
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private boolean isValidExpression(final CronExpression cronExpression) {
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CronTriggerImpl trigger = new CronTriggerImpl();
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trigger.setCronExpression(cronExpression);
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Date date = trigger.computeFirstFireTime(null);
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return date != null && date.after(new Date());
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}
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private boolean isValidExpression(final Date startTime) {
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SimpleTriggerImpl trigger = new SimpleTriggerImpl();
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trigger.setStartTime(startTime);
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Date date = trigger.computeFirstFireTime(null);
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return date != null && date.after(new Date());
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}
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}
SchedulerService 只有一个多态方法schedule,SchedulerServiceImpl实现SchedulerService接口,注入org.quartz.Schedulert和org.quartz.JobDetail,schedule方法可以动态配置org.quartz.CronExpression或org.quartz.SimpleTrigger调度时间。
五、实现自己的org.quartz.JobDetail
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package com.sundoctor.example.service;
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import org.quartz.JobExecutionContext;
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import org.quartz.JobExecutionException;
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import org.quartz.SchedulerException;
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import org.quartz.Trigger;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.springframework.context.ApplicationContext;
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import org.springframework.scheduling.quartz.QuartzJobBean;
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public class MyQuartzJobBean extends QuartzJobBean {
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private static final Logger logger = LoggerFactory.getLogger(MyQuartzJobBean.class);
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@Override
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protected void executeInternal(JobExecutionContext jobexecutioncontext) throws JobExecutionException {
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Trigger trigger = jobexecutioncontext.getTrigger();
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String triggerName = trigger.getKey().getName();
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SimpleService simpleService = getApplicationContext(jobexecutioncontext).getBean("simpleService",
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SimpleService.class);
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simpleService.testMethod(triggerName);
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}
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private ApplicationContext getApplicationContext(final JobExecutionContext jobexecutioncontext) {
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try {
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return (ApplicationContext) jobexecutioncontext.getScheduler().getContext().get("applicationContextKey");
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} catch (SchedulerException e) {
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logger.error("jobexecutioncontext.getScheduler().getContext() error!", e);
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throw new RuntimeException(e);
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}
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}
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}
MyQuartzJobBean继承org.springframework.scheduling.quartz.QuartzJobBean,SimpleService如下:
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package com.sundoctor.example.service;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.springframework.stereotype.Service;
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@Service("simpleService")
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public class SimpleService {
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private static final Logger logger = LoggerFactory.getLogger(SimpleService.class);
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public void testMethod(String triggerName) {
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// 这里执行定时调度业务
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logger.info(triggerName);
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}
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}
SimpleService主要执行定时调度业务,在这里我只是简单打印一下log日志。
配置applicationContext-quartz.xml文件:
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<?xml version="1.0" encoding="UTF-8"?>
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<beans xmlns="http://www.springframework.org/schema/beans"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
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<bean name="quartzScheduler"
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class="org.springframework.scheduling.quartz.SchedulerFactoryBean">
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<property name="dataSource">
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<ref bean="dataSource" />
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</property>
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<property name="applicationContextSchedulerContextKey" value="applicationContextKey" />
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<property name="configLocation" value="classpath:quartz.properties" />
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</bean>
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<bean id="jobDetail" class="org.springframework.scheduling.quartz.JobDetailFactoryBean">
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<property name="jobClass">
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<value>com.sundoctor.example.service.MyQuartzJobBean</value>
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</property>
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<property name="durability" value="true" />
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</bean>
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</beans>
dataSource:项目中用到的数据源,里面包含了quartz用到的数据库表;
applicationContextSchedulerContextKey:是org.springframework.scheduling.quartz.SchedulerFactoryBean这个类中把spring上下文以key/value的方式存放在了quartz的SchedulerContext,可以用applicationContextSchedulerContextKey所定义的key得到spring的ApplicationContext,然后就可使用ApplicationContext取得spring beans,使用方法参见MyQuartzJobBean;
configLocation:用于指明quartz的配置文件的位置,如果不用spring配置quartz的话,本身quartz是通过一个配置文件进行配置的,默认名称是quartz.properties,里面配置的参数在quartz的doc文档中都有介绍,可以调整quartz,我在项目中也用这个文件部分的配置了一些属性,代码如下:
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org.quartz.scheduler.instanceName = DefaultQuartzScheduler
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org.quartz.scheduler.rmi.export = false
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org.quartz.scheduler.rmi.proxy = false
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org.quartz.scheduler.wrapJobExecutionInUserTransaction = false
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orgorg.quartz.threadPool.class = org.quartz.simpl.SimpleThreadPool
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org.quartz.threadPool.threadCount = 10
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org.quartz.threadPool.threadPriority = 5
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org.quartz.threadPool.threadsInheritContextClassLoaderOfInitializingThread = true
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org.quartz.jobStore.misfireThreshold = 60000
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#orgorg.quartz.jobStore.class = org.quartz.simpl.RAMJobStore
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orgorg.quartz.jobStore.class = org.quartz.impl.jdbcjobstore.JobStoreTX
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#orgorg.quartz.jobStore.driverDelegateClass=org.quartz.impl.jdbcjobstore.HSQLDBDelegate
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orgorg.quartz.jobStore.driverDelegateClass=org.quartz.impl.jdbcjobstore.StdJDBCDelegate
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#org.quartz.jobStore.useProperties = true
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org.quartz.jobStore.tablePrefix = QRTZ_
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org.quartz.jobStore.isClustered = false
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org.quartz.jobStore.maxMisfiresToHandleAtATime=1
这里面没有数据源相关的配置部分,采用spring注入datasource的方式已经进行了配置。
六、测试
运行如下测试类
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package com.sundoctor.example.test;
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import java.text.ParseException;
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import java.text.SimpleDateFormat;
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import java.util.Date;
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import org.quartz.SchedulerException;
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import org.springframework.context.ApplicationContext;
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import org.springframework.context.support.ClassPathXmlApplicationContext;
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import com.sundoctor.quartz.service.SchedulerService;
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public class MainTest {
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/**
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* @param args
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* @throws SchedulerException
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*/
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public static void main(String[] args) throws SchedulerException {
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ApplicationContext springContext = new ClassPathXmlApplicationContext(new String[] {
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"classpath:applicationContext.xml", "classpath:applicationContext-quartz.xml" });
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SchedulerService schedulerService = springContext.getBean("schedulerService", SchedulerService.class);
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// 执行业务逻辑...
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// 设置高度任务
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// 每10秒中执行调试一次
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schedulerService.schedule("0/10 * * ? * * *");
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Date startTime = parse("2014-08-19 16:33:00");
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Date endTime = parse("2014-08-22 21:10:00");
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// 2014-08-19 16:33:00开始执行调度
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schedulerService.schedule(startTime);
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// 2014-08-19 16:33:00开始执行调度,2014-08-22 21:10:00结束执行调试
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schedulerService.schedule(startTime, endTime);
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// 2014-08-19 16:33:00开始执行调度,执行5次结束
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schedulerService.schedule(startTime, 5);
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// 2014-08-19 16:33:00开始执行调度,每隔20秒执行一次,执行5次结束
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schedulerService.schedule(startTime, 5, 20);
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// 等等,查看com.sundoctor.quartz.service.SchedulerService
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}
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private static Date parse(String dateStr) {
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SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
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try {
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return format.parse(dateStr);
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} catch (ParseException e) {
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throw new RuntimeException(e);
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}
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}
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}
输出
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[2014-08-19 22:31:50]INFO com.sundoctor.example.service.SimpleService(line:14) -7e132a81-6d24-44e1-8d6c-15cdaeefb2ce
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[2014-08-19 22:32:00]INFO com.sundoctor.example.service.SimpleService(line:14) -7e132a81-6d24-44e1-8d6c-15cdaeefb2ce
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[2014-08-19 22:32:10]INFO com.sundoctor.example.service.SimpleService(line:14) -7e132a81-6d24-44e1-8d6c-15cdaeefb2ce
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[2014-08-19 22:32:20]INFO com.sundoctor.example.service.SimpleService(line:14) -7e132a81-6d24-44e1-8d6c-15cdaeefb2ce
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[2014-08-19 22:32:30]INFO com.sundoctor.example.service.SimpleService(line:14) -7e132a81-6d24-44e1-8d6c-15cdaeefb2ce
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[2014-08-19 22:32:40]INFO com.sundoctor.example.service.SimpleService(line:14) -7e132a81-6d24-44e1-8d6c-15cdaeefb2ce
这样只是简单的将quartz trigger名称打印出来。
这样通过SchedulerService就可以动态配置调度时间。其实SchedulerService 还可扩展,比如可以注入多个JobDetail,调度不同的JobDetail。