五、LISTENER监听器

监听器

Quartz 的监听器有Job监听器，Trigger监听器， Scheduler监听器，对不同层面进行监控。 实际业务用的较多的是Job监听器，用于监听器是否执行了，其他的用的相对较少，本知识主要讲解Job的。

 

MailJobListener

MailJobListener 实现了 JobListener 接口，就必须实现如图所示的4个方法。

 

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package com.how2java;   import org.quartz.JobExecutionContext; import org.quartz.JobExecutionException; import org.quartz.JobListener;   public class MailJobListener implements JobListener {       @Override     public String getName() {         // TODO Auto-generated method stub         return "listener of mail job";     }       @Override     public void jobExecutionVetoed(JobExecutionContext context) {         // TODO Auto-generated method stub         System.out.println("取消执行：\t "+context.getJobDetail().getKey());     }       @Override     public void jobToBeExecuted(JobExecutionContext context) {         // TODO Auto-generated method stub         System.out.println("准备执行：\t "+context.getJobDetail().getKey());     }       @Override     public void jobWasExecuted(JobExecutionContext context, JobExecutionException arg1) {         // TODO Auto-generated method stub         System.out.println("执行结束：\t "+context.getJobDetail().getKey());         System.out.println();     }   }

TestQuartz

修改TestQuartz，于34-36行增加监听器

 

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package com.how2java;   import static org.quartz.JobBuilder.newJob; import static org.quartz.SimpleScheduleBuilder.simpleSchedule; import static org.quartz.TriggerBuilder.newTrigger;   import org.quartz.JobDetail; import org.quartz.JobKey; import org.quartz.Scheduler; import org.quartz.Trigger; import org.quartz.impl.StdSchedulerFactory; import org.quartz.impl.matchers.KeyMatcher;   public class TestQuartz {     public static void main(String[] args) throws Exception{             //创建调度器             Scheduler scheduler = StdSchedulerFactory.getDefaultScheduler();               //定义一个触发器             Trigger trigger = newTrigger().withIdentity("trigger1", "group1") //定义名称和所属的租                 .startNow()                 .withSchedule(simpleSchedule()                     .withIntervalInSeconds(2) //每隔2秒执行一次                     .withRepeatCount(10)) //总共执行11次(第一次执行不基数)                 .build();               //定义一个JobDetail             JobDetail mailJob = newJob(MailJob.class) //指定干活的类MailJob                 .withIdentity("mailjob1", "mailgroup") //定义任务名称和分组                 .usingJobData("email", "admin@10086.com") //定义属性                 .build();               //增加Job监听             MailJobListener mailJobListener= new MailJobListener();             KeyMatcher<JobKey> keyMatcher = KeyMatcher.keyEquals(mailJob.getKey());             scheduler.getListenerManager().addJobListener(mailJobListener, keyMatcher);                           //调度加入这个job             scheduler.scheduleJob(mailJob, trigger);               //启动             scheduler.start();                           //等待20秒，让前面的任务都执行完了之后，再关闭调度器             Thread.sleep(20000);             scheduler.shutdown(true);     } }

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