1.监听类继承ServletContextListener
public class MyListen implements ServletContextListener {
private UserMemberService userMemberService;//需要调用的对象
Calendar calendar = Calendar.getInstance();
private Timer timer = null;
@Override
public void contextInitialized(ServletContextEvent sce) {
//获取对象，此处对象不能直接bean注入获得，因为spring容器不支持多线程的注入
userMemberService = WebApplicationContextUtils.getWebApplicationContext(sce.getServletContext()).getBean(UserMemberService.class);
//设置每天定时执行时间
calendar.set(Calendar.HOUR_OF_DAY, 24);
calendar.set(Calendar.MINUTE,0);
calendar.set(Calendar.SECOND, 0);
Date time = calendar.getTime();
timer = new Timer(true);
timer.schedule(new MyTask(userMemberService), time);
}
@Override
public void contextDestroyed(ServletContextEvent sce) {
timer.cancel();
}
}
2.
public class MyTask extends TimerTask {
private UserMemberService userMemberService;
public MyTask(UserMemberService userMemberService) {
this.userMemberService = userMemberService;
}
@Override
public void run() {
System.out.println(userMemberService==null);//判断对象是否实例化
userMemberService.updateMember();//调用自己的对象方法
}
}
3.web.xml配置监听器
<listener>
<listener-class>
com.huihe.gt.controller.user.member.MyListen
</listener-class>
</listener>
