Quartz任务调度

Quartz入门例子

1.建立任务.

public class QuartzReport implements Job {

	public void execute(JobExecutionContext cntxt) throws JobExecutionException {
		 System.out.println("杨春龙,太帅了");
		 System.out.println( " Generating report -  "
                 +  cntxt.getJobDetail().getJobDataMap().get("type")
                 +  "-"
                 +   new  Date());
	}

}

2.编写quartz.properties文件[放在classpath路径下]

# Configure Main Scheduler Properties
org.quartz.scheduler.instanceName = TestScheduler
org.quartz.scheduler.instanceId = one
# Configure ThreadPool
org.quartz.threadPool.class = org.quartz.simpl.SimpleThreadPool
org.quartz.threadPool.threadCount =  5
org.quartz.threadPool.threadPriority = 4
# Configure JobStore
org.quartz.jobStore.misfireThreshold = 5000
org.quartz.jobStore.class = org.quartz.simpl.RAMJobStore
# ===========================================================================
# Configure SchedulerPlugins  ===============================================
# ===========================================================================
org.quartz.plugin.triggHistory.class = org.quartz.plugins.history.LoggingTriggerHistoryPlugin
org.quartz.plugin.triggHistory.triggerFiredMessage = Trigger {1}.{0} fired job {6}.{5} at: {4, date, HH:mm:ss MM/dd/yyyy}
org.quartz.plugin.triggHistory.triggerCompleteMessage = Trigger {1}.{0} completed firing job {6}.{5} at {4, date, HH:mm:ss MM/dd/yyyy} with resulting trigger instruction code: {9}

org.quartz.plugin.jobInitializer.class = org.quartz.plugins.xml.JobInitializationPlugin
org.quartz.plugin.jobInitializer.fileName = quartz_job.xml
org.quartz.plugin.jobInitializer.overWriteExistingJobs = false
org.quartz.plugin.jobInitializer.failOnFileNotFound = true

org.quartz.plugin.shutdownhook.class = org.quartz.plugins.management.ShutdownHookPlugin
org.quartz.plugin.shutdownhook.cleanShutdown = true

注意:这里指定的quartz_job.xml是相对于classpath的路径.
3.编写quartz_job.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<quartz>
  <job>
    <job-detail>
      <name>QuartzReport</name>
      <group>group1</group>
      <job-class>test.quartz.QuartzReport</job-class>
    </job-detail>
    <trigger>
      <cron>
        <name>任务1</name>
        <group>group1</group>
        <job-name>QuartzReport</job-name>
        <job-group>group1</job-group>
        <cron-expression>0 0/1 * * * ?</cron-expression>
     </cron>
    </trigger>
  </job>
</quartz>

4.编写web.xml引用quartz.

<?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">
	<servlet>
		<servlet-name>QuartzInitializer</servlet-name>
		<servlet-class>
			org.quartz.ee.servlet.QuartzInitializerServlet
		</servlet-class>
		<load-on-startup>1</load-on-startup>
	</servlet>

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

接下来说明一个Quartz的几个概念：
1、Job
表示一个工作，要执行的具体内容。此接口中只有一个方法
void execute(JobExecutionContext context)
2、JobDetail
JobDetail表示一个具体的可执行的调度程序，Job是这个可执行程调度程序所要执行的内容，另外JobDetail还包含了这个任务调度的方案和策略。
3、Trigger代表一个调度参数的配置，什么时候去调。
4、Scheduler代表一个调度容器，一个调度容器中可以注册多个JobDetail和Trigger。当Trigger与JobDetail组合，就可以被Scheduler容器调度了。