Quartz 框架快速入门（四）

Spring的scheduling.quartz包中对Quartz框架进行了封装，使得开发时不用写任何QuartSpring的代码就可以实现定时任务。Spring通过JobDetailBean，MethodInvokingJobDetailFactoryBean实现Job的定义。后者更加实用，只需指定要运行的类，和该类中要运行的方法即可，Spring将自动生成符合Quartz要求的JobDetail。

在上一篇文章《Quartz 框架快速入门（三）》中我们将示例迁移到Web环境下了，但使用的是Quartz的启动机制，这一篇中我们将让Web服务器启动Spring，通过Spring的配置文件来进行任务的调度

1,创建一个Web项目，加入spring.jar，quartz-1.6.0.jar，commons-collections.jar，jta.jar ，commons-logging.jar这几个包.

2,创建一个类，在类中添加一个方法execute,我们将对这个方法进行定时调度.

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> -->package com.vista.quartz;

import java.util.Date;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;

publicclass HelloWorld
{
privatestatic Log logger = LogFactory.getLog(HelloWorld.class);//日志记录器
public HelloWorld()
{
}
publicvoid execute()
{
logger.info("Kick your ass and Fuck your mother! - "+new Date());
}
}

2. Spring配置文件applicationContext.xml 修改如下：

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> --><?xml version="1.0" encoding="UTF-8"?>
<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">

<!-- 要调用的工作类 -->
<bean id="quartzJob" class="com.vista.quartz.HelloWorld"></bean>
<!-- 定义调用对象和调用对象的方法 -->
<bean id="jobtask" class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean">
<!-- 调用的类 -->
<property name="targetObject">
<ref bean="quartzJob"/>
</property>
<!-- 调用类中的方法 -->
<property name="targetMethod">
<value>execute</value>
</property>
</bean>
<!-- 定义触发时间 -->
<bean id="doTime" class="org.springframework.scheduling.quartz.CronTriggerBean">
<property name="jobDetail">
<ref bean="jobtask"/>
</property>
<!-- cron表达式 -->
<property name="cronExpression">
<value>10,15,20,25,30,35,40,45,50,55 * * * * ?</value>
</property>
</bean>
<!-- 总管理类 如果将lazy-init='false'那么容器启动就会执行调度程序 -->
<bean id="startQuertz" lazy-init="false" autowire="no" class="org.springframework.scheduling.quartz.SchedulerFactoryBean">
<property name="triggers">
<list>
<ref bean="doTime"/>
</list>
</property>
</bean>
</beans>

3,先在控制台中对上面的代码进行测试，我们要做的只是加载Spring的配置文件就可以了，代码如下:

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> -->package com.vista.quartz;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

publicclass Test
{
publicstaticvoid main(String[] args)
{
System.out.println("Test start.");
ApplicationContext context =new ClassPathXmlApplicationContext("applicationContext.xml");
//如果配置文件中将startQuertz bean的lazy-init设置为false 则不用实例化
//context.getBean("startQuertz");
System.out.print("Test end..");
}
}

4,然后将Web.xml修改如下，让tomcat在启动时去初始化Spring：

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> --><?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>
/WEB-INF/classes/applicationContext.xml
</param-value>
</context-param>

<servlet>
<servlet-name>SpringContextServlet</servlet-name>
<servlet-class>org.springframework.web.context.ContextLoaderServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>

<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>

5,最后启动Tomcat,测试结果如下图所示：