Tomcat中简易定时器的实现
定时器代码：
import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;import java.util.Timer;import java.util.TimerTask;import javax.servlet.ServletContextEvent;import javax.servlet.ServletContextListener;public class MyTimerTask implements ServletContextListener{private Timer timer = null;public void contextDestroyed(ServletContextEvent event){timer.cancel();event.getServletContext().log("定时器销毁");}public void contextInitialized(ServletContextEvent event){timer = new Timer(true);event.getServletContext().log("定时器已启动");//添加日志，可在tomcat日志中查看到Date date;try {date = new SimpleDateFormat("yyyy-MM-dd mm:ss").parse("2011-08-29 17:46");timer.schedule(new MyTask(),date,1*60*1000);} catch (ParseException e) {e.printStackTrace();}}class MyTask extends TimerTask{@Overridepublic void run() {System.out.println("hello greatjone !");}}}?web.xml的配制：
<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <listener> <listener-class>MyTimerTask</listener-class> </listener></web-app>?