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由于OpenJWeb平台集成了Spring框架,所以定时作业的开发非常方便,首先一个被定时器调用的类:

package org.openjweb.common.timer;

import org.apache.log4j.Logger;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;
import org.springframework.scheduling.quartz.QuartzJobBean;

public class JobSchedule extends QuartzJobBean
{
static Logger logger = Logger.getLogger(JobSchedule.class);
static long counter = 0; //计数器
public synchronized void doTimerSchedule()
{
System.out.println("测试定时器........");
}

protected void executeInternal(JobExecutionContext arg0) throws JobExecutionException {
// TODO Auto-generated method stub

}

}

上面的doTimerSchedule是被定时调用的方法,下文讲述此方法在spring配置文件中如何配置为定时调用:

<?xml version="1.0" encoding="GB2312"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.0.xsd">

<!-- Timer Schedule config start -->
<!-- defime a business timer object-->
<bean id="EAITimerBean" class="org.openjweb.common.timer.JobSchedule"/>
<!--defime which method of class to be called in timer schedule -->
<bean id="EAITimerMethod" class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean">
<property name="targetObject" ref="EAITimerBean" />
<property name="targetMethod" value="doTimerSchedule" />
<property name="concurrent" value="false" /> <!--将并发设置为false-->
</bean>
<!-- 设置定时器 -->
<bean id="eaiTrigger" class="org.springframework.scheduling.quartz.CronTriggerBean">
<property name="jobDetail" ref="EAITimerMethod" />
<!--每两分钟触发-->
<property name="cronExpression" value="0 1/2 * * * ?" />
</bean>

<bean class="org.springframework.scheduling.quartz.SchedulerFactoryBean">
<property name="triggers">
<list>
<!--EAI调度器,list下可加入其他的调度器-->
<ref bean="eaiTrigger"/>
</list>
</property>
</bean>

<!-- Timer Schedule config end -->

</beans>

如果你的开发环境中集成了spring后,将上面的代码和xml配置放到你自己应用对应的位置编译启动tomcat后可以看到后台每两分钟输出一次调试信息.1/2表示每两分钟的第一分钟.