浅谈Quartz(WEB)

Quartz是纯JAVA的调度框架，应用广泛，支持JAVA应用程序和WEB程序，最近在项目中小试了一下，还不错，下面刨除业务逻辑，用简单的实例展示Quartz在WEB程序中的应用。

准备工作：java IDE(eclipse)，quartz-1.6.4.jar，commons-collections-3.1.jar，commons-logging-1.0.4.jar。

新建WEB工程
首先，在web.xml文件中对quartz进行注册，这里采用监听器的注册方式，其他方式可参考官方文档。

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
	xmlns="http://java.sun.com/xml/ns/javaee" 
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
	http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
  <listener>
    <listener-class>
     org.quartz.ee.servlet.QuartzInitializerListener   
    </listener-class>
  </listener>
</web-app>

编写一个job类，要实现Job接口。

package com.ares.quartz;

import java.util.Date;

import org.quartz.Job;
import org.quartz.JobDetail;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;

/**
 * @Title: HelloWorld.java
 * @Package com.ares.quartz
 * @Description: TODO
 * @author [email protected]
 * @date 2009-12-21 下午09:24:41
 * @version V1.0
 */
public class HelloWorld implements Job {

	/**
	 * @Title: execute
	 * @Description: execute
	 * @param @param context
	 * @return void
	 * @throws
	 */
	public void execute(JobExecutionContext context)
			throws JobExecutionException {
		JobDetail jobDetail = context.getJobDetail();
		try {
            //从jobDataMap获得传入的变量值
			System.out.println("Hello World "
					+ jobDetail.getJobDataMap().get("NAME") + " " + new Date());
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}

编写一个简单的servlet，用于WEB前端调用，web.xml注册servlet，略。

package com.ares.quartz;

import java.io.IOException;
import java.util.Date;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.quartz.JobDataMap;
import org.quartz.JobDetail;
import org.quartz.Scheduler;
import org.quartz.SchedulerException;
import org.quartz.SimpleTrigger;
import org.quartz.Trigger;
import org.quartz.TriggerUtils;
import org.quartz.ee.servlet.QuartzInitializerListener;
import org.quartz.impl.StdSchedulerFactory;

/**
 * @Title: TestQuartz.java
 * @Package com.ares.quartz
 * @Description: TODO
 * @author [email protected]
 * @date 2009-12-21 下午09:54:22
 * @version V1.0
 */
public class TestQuartz extends HttpServlet {

	/**
	 * @Fields serialVersionUID : TODO
	 */
	
	private static final long serialVersionUID = 1L;

	/**
	 * Constructor of the object.
	 */
	public TestQuartz() {
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doGet method of the servlet. <br>
	 * 
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request
	 *            the request send by the client to the server
	 * @param response
	 *            the response send by the server to the client
	 * @throws ServletException
	 *             if an error occurred
	 * @throws IOException
	 *             if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		doPost(request, response);
	}

	/**
	 * The doPost method of the servlet. <br>
	 * 
	 * This method is called when a form has its tag value method equals to
	 * post.
	 * 
	 * @param request
	 *            the request send by the client to the server
	 * @param response
	 *            the response send by the server to the client
	 * @throws ServletException
	 *             if an error occurred
	 * @throws IOException
	 *             if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		// Retrieve the factory from the ServletContext
		StdSchedulerFactory factory = (StdSchedulerFactory) request
				.getSession().getServletContext().getAttribute(
						QuartzInitializerListener.QUARTZ_FACTORY_KEY);
		// Retrieve the scheduler from the factory
		Scheduler scheduler;
		try {
			scheduler = factory.getScheduler();
			// Start the scheduler
			scheduler.start();
			// Create a JobDetail for the Job
			JobDetail jobDetail = new JobDetail("job", Scheduler.DEFAULT_GROUP,
					HelloWorld.class);
			// Configure the directory to scan
			JobDataMap jobDataMap = jobDetail.getJobDataMap();
            // 传入参数，quartz数据交互的一种方式。
			jobDataMap.put("NAME", request.getParameter("name"));
			Trigger trigger = new SimpleTrigger("job", null, TriggerUtils
					.getEvenMinuteDate(new Date()), null, 0, 0L);
			// Associate the trigger with the job in the scheduler
			scheduler.scheduleJob(jobDetail, trigger);
		} catch (SchedulerException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		response.sendRedirect("/testQuartz/index.jsp");
	}

	/**
	 * Initialization of the servlet. <br>
	 * 
	 * @throws ServletException
	 *             if an error occurs
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}

编写WEB前端页面，index.jsp

<%@ page language="java" pageEncoding="utf8"%>
<html>
	<head>
		<title>TEST QUARTZ</title>
	</head>
	<body>
		<form action="servlet/TestQuartz">
			<input type="text" name="name" />
			<input type="submit" 
value="sayHelloWorld" />
		</form>
	</body>
</html>

将工程部署到WEB容器中，如tomcat等。

在文本框随便输入点字符，点击“sayHelloWorld”按钮。

容器的控制台将在下一分钟输出形如下面的内容
2009-12-21 22:17:47 org.quartz.core.QuartzScheduler start
信息: Scheduler DefaultQuartzScheduler_$_NON_CLUSTERED started.
Hello World Ares Mon Dec 21 22:18:00 CST 2009

附件是实例代码，仅供参考。