web.xml启动时调用java类方法

<listener>
<listener-class>com.test</listener-class> //该类为java类路径标示要执行的接口 需在web。xm里面配置
</listener>

public abstract class SmsListenerAdapter implements ServletContextListener { //集成了监听接口
@Override
public abstract void contextInitialized(ServletContextEvent sce);//此方法为要调用方法
@Override
public void contextDestroyed(ServletContextEvent sce) {

}

import javax.servlet.ServletContextEvent;

/**
* Created by panhaicheng on 14-8-20.
*/
public class SmsListener extends SmsListenerAdapter {
@Override
public void contextInitialized(ServletContextEvent sce) {//重写该方法
CacheUtil.putToMap(); //要执行的静态方法
}
}