Spring定时器的两种实现方式

有两种流行Spring定时器配置：Java的Timer类和OpenSymphony的Quartz。

1.Java Timer定时

首先继承java.util.TimerTask类实现run方法

[java] view plaincopyprint?
import java.util.TimerTask;
public class EmailReportTask extends TimerTask{
@Override
 public void run() { }
}

timerTask属性告诉ScheduledTimerTask运行哪个。86400000代表24个小时

启动Spring定时器

Spring的TimerFactoryBean负责启动定时任务

<bean class="org.springframework.scheduling.timer.TimerFactoryBean">
<property name="scheduledTimerTasks">
 <list><ref bean="scheduleReportTask"/>list>
property>
bean>
scheduledTimerTasks里显示一个需要启动的定时器任务的列表。
可以通过设置delay属性延迟启动
<bean id="scheduleReportTask" class="org.springframework.scheduling.timer.ScheduledTimerTask">
<property name="timerTask" ref="reportTimerTask" />
<property name="period">
<value>86400000value>
property>
<property name="delay">
<value>3600000value>
property>
bean>
这个任务我们只能规定每隔24小时运行一次，无法精确到某时启动

2.Quartz定时器

首先编写服务类：

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import java.util.Date;

public class CourseService {
 public void start(){
 System.out.println(new Date().getSeconds());
 }
}


编写调度类，需要继承QuartzJobBean ：

package QuartzTest;

import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;
import org.springframework.scheduling.quartz.QuartzJobBean;

public class QuartzJob extends QuartzJobBean {

 protected void executeInternal(JobExecutionContext arg0) throws JobExecutionException {
 courseService.start();
 }

 private CourseService courseService;

 public CourseService getCourseService() {
 return courseService;
 }

 public void setCourseService(CourseService courseService) {
 this.courseService = courseService;
 }


}

编写配置文件
需要说明的是，我们有两种trigger，分别是simple和cron模式，simple方式和timertask类似，采用设置interval方式进行调度，而cron可以特有的语法很详细的定制调度执行时间，具体描述在配置文件的注释中
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd" >
<beans>
 <bean id="courseService" class="QuartzTest.CourseService"/>
 
 <bean id="reportJbo" class="org.springframework.scheduling.quartz.JobDetailBean">
 <property name="jobClass">
 <value>QuartzTest.QuartzJob</value>
 </property>
 <property name="jobDataAsMap">
 <map>
 
 <entry key="courseService">
 <ref bean="courseService"/>
 </entry>
 </map>
 </property>
 </bean>

 
 
 <bean id="simpleReportTrigger" class="org.springframework.scheduling.quartz.SimpleTriggerBean">
 <property name="jobDetail">
 <ref bean="reportJbo"/>
 </property>
 <property name="repeatInterval">
 <value>1000</value>
 </property>
 </bean>

 
 <bean id="cronReportTrigger" class="org.springframework.scheduling.quartz.CronTriggerBean">
 <property name="jobDetail">
 <ref bean="reportJbo"/>
 </property>
 <property name="cronExpression">
 <value>02 20 21 7 6 ? 2007</value>
 
 </property>
 </bean>

 
 <bean id="start" class="org.springframework.scheduling.quartz.SchedulerFactoryBean">
 <property name="triggers">
 <list>
 <ref bean="cronReportTrigger"/>
 </list>
 </property>
 </bean>
</beans>

Spring还为我们提供了更简单的加载调度的方式，也就说我们在已经有业务方法CourseService时不需要再额外编写调度类QuartzJob,可以直接配置service的方法

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<bean id="reportJbo" class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean">
 <property name="targetObject">
 <ref bean="courseService"/>
 </property>
 <property name="targetMethod">
 <value>start</value>
 </property>
 </bean>

<bean id="findAppSaveTimeEnd" class="com.skyon.psbc.cas.job.app.FindAppSaveTimeEnd" lazy-init="false" singleton="false" >
<property name="appTaskService" ref="appTaskService"></property>
</bean>
<bean id="findAppTimeEnd" class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean">
 <property name="targetObject">
 <ref bean="findAppSaveTimeEnd"/>
 </property>
 <property name="targetMethod">
 <value>executeJob</value>
 </property>
</bean>
<bean id="findAppTime" class="org.springframework.scheduling.quartz.CronTriggerBean">
 <property name="jobDetail">
 <ref bean="findAppTimeEnd"/>
 </property>
 <property name="cronExpression">
 <value>0 0 0 * * ?</value>
 </property>
</bean>



<bean id="startQuertz" lazy-init="true" autowire="no" class="org.springframework.scheduling.quartz.SchedulerFactoryBean">
<property name="triggers">
<list>
 <ref bean="findAppTime"/>
</list>
</property>
</bean>

Spring定时器的两种实现方式

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