quartz实现定时功能实例详解(servlet定时器配置方法)

public class TestJob implements Job
{
   public TestJob(){}
   public void execute(JobExecutionContext arg0) throws JobExecutionException
   {
      String name = context.getJobDetail().getJobDataMap().getString("name");
      System.out.println("job executing..."+name);   }
}

public class QuartzTest
{
 public static void main(String[] args)
 {
    QuartzTest test = new QuartzTest();
    try
   {
      test.startSchedule();
   }
  catch (Exception e)
  {
     e.printStackTrace();
  }
 }
 public void startSchedule() throws Exception
 {
     Scheduler scheduler = StdSchedulerFactory.getDefaultScheduler();
     JobDetail jobDetail =
      new JobDetail("testJob", Scheduler.DEFAULT_GROUP, TestJob.class);
      //结束时间    
     long end = System.currentTimeMillis() + 9000L;
    //执行10次，每3秒执行一次，到9秒后结束
     SimpleTrigger trigger = new SimpleTrigger("test",null,new Date(),new Date(end),10,3000L);
      scheduler.scheduleJob(jobDetail, trigger);
     scheduler.start();
 }
}
 

<servlet>
   <servlet-name>QuartzInitializer</servlet-name>
   <servlet-class>org.quartz.ee.servlet.QuartzInitializerServlet</servlet-class>
   <init-param>
     <param-name>shutdown-on-unload</param-name>
     <param-value>true</param-value>
   </init-param>
   <init-param>
    <param-name>config-file</param-name>
    <param-value>quartz.properties</param-value>
   </init-param>
   <load-on-startup>2</load-on-startup>
 </servlet>
listener配置可以看源码，主要的上面的参数配置为<context-param>,再加一个<listener>.

上面提到了quartz.properties,这是自行指定的，Quartz提供了一个默认的配置文件，可以满足基本的j2se应用，如果在web应用中，我们想把job,trigger配置都写到文件中，就需要自己来写，并指定在初始化时加载我们自己的quratz.properties，位置放在classes下。

#============================================================================
# Configure Main Scheduler Properties 
#============================================================================
org.quartz.scheduler.instanceName = org.quartz.scheduler.instanceId = AUTO
#============================================================================
# Configure ThreadPool 
#============================================================================
org.quartz.threadPool.class = org.quartz.simpl.SimpleThreadPool
org.quartz.threadPool.threadCount = 3
org.quartz.threadPool.threadPriority = 5
#============================================================================
# Configure Plugins
#============================================================================
org.quartz.plugin.triggHistory.class = org.quartz.plugins.history.LoggingJobHistoryPlugin
org.quartz.plugin.jobInitializer.class = org.quartz.plugins.xml.JobInitializationPlugin
org.quartz.plugin.jobInitializer.fileName = /scheduler/quartz_jobs.xml
org.quartz.plugin.jobInitializer.overWriteExistingJobs = true
org.quartz.plugin.jobInitializer.failOnFileNotFound = true
org.quartz.plugin.jobInitializer.scanInterval = 10

quartz要使用插件来加载自己的xml配置文件，上边我们指定了在初始化时加载classes/scheduler/quartz_jobs.xml，默认的是加载classes/quartz_jobs.xml文件。

quartz_jobs.xml文件：
<?xml version='1.0' encoding='utf-8'?>
<quartz>
 <job>
　　 <job-detail>
  　　<name>test</name>
  　　<group>DEFAULT</group>
  　　<description>testJobhere</description>
  　　<job-class>TestJob</job-class>
  　　<job-data-map allows-transient-data="true">
   　　<entry>
    　　<key>name</key>
   　　 <value>test</value>
   　　</entry>
   </job-data-map>
 　　</job-detail>
　　 <trigger>
             <cron>
                  <name>testCron</name>
                  <group>DEFAULT</group>
                  <job-name>test</job-name>
                 <job-group>DEFALUT</job-group>
                 <cron-expression>0/3 * * * * ?</cron-expression>
             </cron>
       </trigger>
　 </job>
</quartz>

public class TestJob implements Job
{
 public TestJob(){}
 public void execute(JobExecutionContext context) throws JobExecutionException
 {
     String name = context.getJobDetail().getJobDataMap().getString("name");
     System.out.println("job executing..."+name);
 }
}