Java Web应用中的任务调度(2)

  <servlet>

     <servlet-name>QuartzInitializer</servlet-name>
     <display-name>Quartz Initializer Servlet</display-name>

  <servlet-class>
    org.quartz.ee.servlet.QuartzInitializerServlet
  </servlet-class>
  <load-on-startup>1</load-on-startup>
  <init-param>
    <param-name>shutdown-on-unload</param-name>
    <param-value>true</param-value>
  </init-param>

  <init-param>
    <param-name>start-scheduler-on-load</param-name>
    <param-value>false</param-value>
    </init-param>

 </servlet>

import org.quartz.JobDataMap;
import org.quartz.JobDetail;
import org.quartz.JobExecutionContext;

//extend the proper Quartz class
//继承适当的Quartz类
public class HelloWorld extends Job {

//override the execute method
//覆盖execute方法
    public void execute(JobExecutionContext context) {

// Every job has it's own job detail
//每个Job都有独立的JobDetail
    JobDetail jobDetail = context.getJobDetail();
// The name is defined in the job definition
//name在Job定义中指定
    String jobName = jobDetail.getName();
//Every job has a Job Data map for storing extra information
//每个Job都有一个Job Data map来存放额外的信息
    JobDataMap dataMap = jobDetail.getJobDataMap();
      
       System.out.println("Hello World!!!");
   }
 }

每5秒执行一次的触发器
/*  *
 * 方法一：makeSecondlyTrigger
 * 注意以下代码将创建一个立即启动的触发器。要控制启动时间，使用
 * trigger.setStartTime(Date)方法。
 */
Trigger trigger = TriggerUtils.makeSecondlyTrigger(5);
trigger.setName("MyFiveSecondTrigger");
trigger.setGroup("MyTriggerGroup");

 /*
 *
 * 方法二：设置SimpleTrigger的重复次数和间隔时间。
 * 注意以下代码将创建一个立即启动的触发器。要控制启动时间，使用
 * trigger.setStartTime(Date)方法。
 */
Trigger trigger = new SimpleTrigger("trigger1", "group1");
trigger.setRepeatCount(SimpleTrigger.REPEAT_INDEFINITELY);
trigger.setRepeatInterval(5000L); // milliseconds