服务器监听

01.import java.util.Timer;
02.
03.import javax.servlet.ServletContextEvent;
04.import javax.servlet.ServletContextListener;
05.
06.public class TestListener implements ServletContextListener {
07. private Timer timer = null;
08.
09. public void contextInitialized(ServletContextEvent event) {
10. timer = new Timer(true);
11. timer.schedule(new TestTimer(), 0, 86400000);//milliseconds
12. }
13.
14. public void contextDestroyed(ServletContextEvent event) {
15. timer.cancel();
16. }
17.}
18.
19.------------------------------------------
20.
21.import java.util.TimerTask;
22.
23.public class TestTimer extends TimerTask {
24. public void run() {
25. // do something ...
26. }
27.}
28.
29.------------------------------------------
30.
31.web.xml:
32.
33.<listener>
34.<listener-class>test.TestListener</listener-class>
35.</listener>