tomcat定时任务--ServletContextListener

SysContextListener.java

 

  
    

   
     
   
     package
   
      com.tq365.util;


   
     import
   
      java.util.Timer;


   
     import
   
      javax.servlet.ServletContextEvent;

   
     import
   
      javax.servlet.ServletContextListener;


   
     import
   
      com.tq365.test.Task;


   
     public
   
      
   
     class
   
      SysContextListener 
   
     implements
   
      ServletContextListener{
 
   
     private
   
      Timer timer
   
     =
   
     null
   
     ;
 
 
   
     //
   
     在这里初始化监听器,在tomcat启动的时候监听器启动,可以在这里实现定时器功能
   
     

   
      
   
     public
   
      
   
     void
   
      contextInitialized(ServletContextEvent event) {
 System.out.println(
   
     "
   
     监听器已经初始化!
   
     "
   
     );
 timer
   
     =
   
     new
   
      Timer();
 event.getServletContext().log(
   
     "
   
     Tomcat定时器已经启动.....
   
     "
   
     );
 
   
     //
   
     调用exportHistoryBean,0表示任务无延迟,5*1000表示每隔5秒执行任务,60*60*1000表示一个小时
 
   
     //
   
     timer.schedule(new SpecifiedTask(), 0, 5*1000);
 
   
     //
   
     timer.schedule(new Task(), 0, 10*1000);
   
     

   
      event.getServletContext().log(
   
     "
   
     任务已经添加.....
   
     "
   
     );
 }
 
   
     public
   
      
   
     void
   
      contextDestroyed(ServletContextEvent event) {
 
   
     //
   
     在这里关闭监听器,同时关闭定时器
   
     

   
      timer.cancel();
 event.getServletContext().log(
   
     "
   
     定时器关闭.....
   
     "
   
     );
 }
}

  
    

SpecifiedTask.java 定时执行的任务

 

  
    

   
     
   
     package
   
      com.tq365.util;

   
     import
   
      java.util.TimerTask;

   
     import
   
      com.tq365.mail.SendMail;


   
     public
   
      
   
     class
   
      SpecifiedTask 
   
     extends
   
      TimerTask {
 
   
     private
   
      
   
     static
   
      
   
     boolean
   
      isRunning 
   
     =
   
      
   
     false
   
     ;
 
   
     public
   
      SpecifiedTask(ServletContext context){
 
   
     this
   
     .context
   
     =
   
     context;
 }
   
     */
   
     
 @Override
 
   
     public
   
      
   
     void
   
      run() {
 
   
     if
   
     (
   
     !
   
     isRunning){
 isRunning
   
     =
   
     true
   
     ;
 System.out.println(
   
     "
   
     定时打印...........
   
     "
   
     );
 SendMail.sendMail();
   
     //
   
     定时发送邮件
   
     

   
      }
 }

}