java定时任务，每天定时执行任务

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监听器：

import java.util.Calendar;import java.util.Date;import java.util.Timer;import javax.servlet.ServletContextEvent;import javax.servlet.ServletContextListener;public class WeatherImageListener implements ServletContextListener {Timer timer = new Timer() ; public void contextDestroyed(ServletContextEvent arg) { timer.cancel(); //销毁定时器}public void contextInitialized(ServletContextEvent arg0) {//时间间隔 long daytime = 24 * 60 * 60 * 1000;/*** 定制每日23:00执行方法 ***/  Calendar calendar = Calendar.getInstance();   calendar.set(Calendar.HOUR_OF_DAY, 24);  calendar.set(Calendar.MINUTE, 0);  calendar.set(Calendar.SECOND, 0);//第一次执行定时任务的时间  Date date=calendar.getTime();  timer = new java.util.Timer(true);  //启动定时器timer.schedule(new WeatherImageTask(), new Date(),15000); //启动和间隔时间 间隔1天}}

定时器：

public class WeatherImageTask extends TimerTask   { private static final Log log = LogFactory.getLog(WeatherImageTask.class);  public void run() {    //执行想要执行的任务  }}

配置文件：web.xml

 <listener>     <listener-class>com.toolsba.taobao.task.WeatherImageListener</listener-class>   </listener>