Quartz 框架的应用

这里是 Quartz在Spring中的简单使用 http://yangpanwww.iteye.com/blog/797563

本文将简单介绍在没有 Spring 的时候..如何来使用 Quartz...

这里跳过 Quartz 的其他介绍。如果想更加输入的了解 Quartz，大家可以点击下载Quartz的帮助文档。

Quartz 和 Web 集成应用

第一步：导入quartz包..这个不用说吧..放到工程的 lib 下面即可

第二步：添加相应文件和修改web.xml文件的配置.

添加 quartz.properties 和 quartz_jobs.xml 到 src 下面

quartz.properties文件如下：

#===============================================================     
#Configure Main Scheduler Properties     
#===============================================================       
org.quartz.scheduler.instanceName = QuartzScheduler       
org.quartz.scheduler.instanceId = AUTO     
 
#===============================================================     
#Configure ThreadPool     
#===============================================================       
org.quartz.threadPool.threadCount = 5       
org.quartz.threadPool.threadPriority = 5       
org.quartz.threadPool.class = org.quartz.simpl.SimpleThreadPool     
 
#===============================================================     
#Configure JobStore     
#===============================================================       
org.quartz.jobStore.class = org.quartz.simpl.RAMJobStore     
 
#===============================================================     
#Configure Plugins    
#===============================================================       
org.quartz.plugin.jobInitializer.class = org.quartz.plugins.xml.JobInitializationPlugin      
org.quartz.plugins.xml.JobInitializationPlugin = quartz_jobs.xml   
      
org.quartz.plugin.jobInitializer.overWriteExistingJobs = false      
org.quartz.plugin.jobInitializer.validating = false      
org.quartz.plugin.jobInitializer.failOnFileNotFound =true

quartz_jobs.xml 文件如下

<?xml version="1.0" encoding="UTF-8"?>
<quartz>
	<job>

		<job-detail>
			<name>GatherJob</name>
			<group>DEFAULT</group>
			<description>GatherJob</description>
			<job-class>net.sf.rain.gather.quartz.GatherJob</job-class>
			<volatility>false</volatility>
			<durability>false</durability>
			<recover>false</recover>
		</job-detail>

		<trigger>
			<cron>
				<name>RunQuartzJobTrigger</name>
				<group>DEFAULT</group>
				<description>RunQuartzJobTrigger</description>
				<job-name>RunQuartzJob</job-name>
				<job-group>DEFAULT</job-group>
				<!--  <cron-expression>0/60 * * * * ?</cron-expression> -->
				<cron-expression>0 0 3 * * ?</cron-expression>
			</cron>
		</trigger>

	</job>
</quartz>

注意文件中的配置要正确。比如 job-class 等等。

web.xml的配置：

从 2.3 版本的 Servlet API 开始，你能创建监听器，由容器在其生命周期中的某个特定时间回调。其中的一个监听器接口叫做 java.servlet.ServletContextListener，

WEB.xml

	<!-- ====================== Quartz config start ====================== -->
	<context-param>
		<param-name>config-file</param-name>
		<param-value>/quartz.properties</param-value>
	</context-param>

	<context-param>
		<param-name>shutdown-on-unload</param-name>
		<param-value>true</param-value>
	</context-param>

	<context-param>
		<param-name>start-scheduler-on-load</param-name>
		<param-value>true</param-value>
	</context-param>
	<!-- 默认情况下配置 Quzrtz 自带的监听器..但是真正项目开发中。我们是否开启定时任务应该是人工配置，所以我们需要自定义监听器 -->
	<!-- 
	<listener>
     	<listener-class>org.quartz.ee.servlet.QuartzInitializerListener</listener-class>
    </listener>
	-->
	<listener>  
	   <listener-class>  
	  		net.sf.rain.gather.quartz.QuartzServletContextListener   
	   </listener-class>  
	</listener> 
	 
	<!-- ====================== Quartz config end ====================== -->

下面我们将实现这个监听器 QuartzServletContextListener

package net.sf.rain.gather.quartz;

import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.quartz.SchedulerException;
import org.quartz.impl.StdSchedulerFactory;

public class QuartzServletContextListener implements ServletContextListener {

	private static  Log _log = LogFactory.getLog(QuartzServletContextListener.class);

	public static final String QUARTZ_FACTORY_KEY = "org.quartz.impl.StdSchedulerFactory.KEY";
	private ServletContext ctx = null;
	private StdSchedulerFactory factory = null;

	/**
	 * Called when the container is shutting down. 
	 */
	public void contextDestroyed(ServletContextEvent sce) {
		try {
			factory.getDefaultScheduler().shutdown();
		} catch (SchedulerException ex) {
			_log.error("Error stopping Quartz", ex);
		}
	}

	
	/**
	 * 容器的第一次启动时调用
	 */
	public void contextInitialized(ServletContextEvent sce) {
		ctx = sce.getServletContext();
		try {
			factory = new StdSchedulerFactory();
			// Start the scheduler now
			//设置容器启动时不立即启动定时器，而是到后台人工启动
			//factory.getScheduler().start();
			_log.info("Storing QuartzScheduler Factory at" + QUARTZ_FACTORY_KEY);
			ctx.setAttribute(QUARTZ_FACTORY_KEY, factory);

		} catch (Exception ex) {
			_log.error("Quartz failed to initialize", ex);
		}
	}

}

下面的Action将管理定时器的状态

package net.sf.rain.gather.quartz;

import java.io.PrintWriter;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.lang.StringUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.quartz.Scheduler;
import org.quartz.SchedulerException;
import org.quartz.impl.StdSchedulerFactory;

/**
 * 
 * 调度器管理 
 * 
 * @author 妞见妞爱
 *
 */
public class GatherJobAction extends  Action{

	private static  Log _log = LogFactory.getLog(GatherJobAction.class);
	
	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response)
			throws Exception {
		
		request.setCharacterEncoding("UTF-8");
		response.setContentType("text/html;charset=UTF-8");
		
		String action = request.getParameter("action");
		  
        
        String retMsg = "Parameter Error: action is null";
        if (StringUtils.isNotBlank(action)) {
    		ServletContext ctx =  request.getSession().getServletContext();
            // Retrieve the factory from the ServletContext   
            StdSchedulerFactory factory =  (StdSchedulerFactory)ctx.getAttribute(QuartzServletContextListener.QUARTZ_FACTORY_KEY);   
            // Retrieve the scheduler from the factory   
            Scheduler scheduler = factory.getScheduler(); 
            
        	if ("start".equals(action)) {
    			// Start the scheduler 
    	        try {
    	        	 if (!scheduler.isStarted()) {
    	        		 scheduler.start();
    	        	 }
    	        	 retMsg = "Quartz Successful to startup";
    			 } catch (SchedulerException ex) {
    				 _log.error("Error starting Quartz", ex);
    				 retMsg = "Quartz failed to startup";
    			 }
    		}else if("stop".equals(action)){
    			try {
    				if (scheduler.isStarted()) {
    					scheduler.shutdown();
    				}
    				retMsg = "Quartz Successful to stopping";
    			 } catch (SchedulerException ex) {
    				_log.error("Error stopping Quartz", ex);
    				retMsg = "Quartz failed to stopping";
    			 }
    		}else { //查看调度器的状态
				if (scheduler.isStarted()) {
					retMsg = "Quartz is Started";
				}else {
					retMsg = "Quartz is Stoped";
				}
			}
		}
        
		PrintWriter out = response.getWriter();
		out.print(retMsg);
		out.flush();
		out.close();
		
		return null;
	}


}

有点事情。。忙会。。哈哈。。应该差不多了。。。。

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