Servlet 3.1 api中@WebListener实现servlet监听

在Servlet 3.1中，使用@WebListener注解来标识一个Servlet监听器，相关的监听接口有：

1. ServletContextListener 

package javax.servlet;

import java.util.EventListener;


public interface ServletContextListener extends EventListener {

    //监听容器初始化事件    
    public void contextInitialized(ServletContextEvent sce);

    //监听容器销毁事件    
    public void contextDestroyed(ServletContextEvent sce);
}

2.ServletContextAttributeListener

public interface ServletContextAttributeListener extends EventListener {

    // 属性被添加
    public void attributeAdded(ServletContextAttributeEvent event);

    // 属性被移除
    public void attributeRemoved(ServletContextAttributeEvent event);

    // 属性被更新
    public void attributeReplaced(ServletContextAttributeEvent event);
}

3.ServletRequestListener 

public interface ServletRequestListener extends EventListener {

    // 请求销毁
    public void requestDestroyed(ServletRequestEvent sre);

    // 请求初始化
    public void requestInitialized(ServletRequestEvent sre);
}

4.ServletRequestAttributeListener

public interface ServletRequestAttributeListener extends EventListener {

    // 属性添加
    public void attributeAdded(ServletRequestAttributeEvent srae);

    
    // 属生删除
    public void attributeRemoved(ServletRequestAttributeEvent srae);

    // 属性替换
    public void attributeReplaced(ServletRequestAttributeEvent srae);
}

5.HttpSessionListener

public interface HttpSessionListener extends EventListener {
    
    // 会话创建
    public void sessionCreated(HttpSessionEvent se);
    
    // 会话销毁
    public void sessionDestroyed(HttpSessionEvent se);
    
}

6.HttpSessionAttributeListener 

public interface HttpSessionAttributeListener extends EventListener {

    // 属性添加
    public void attributeAdded(HttpSessionBindingEvent event);

    // 属性移除
    public void attributeRemoved(HttpSessionBindingEvent event);

    // 属性替换
    public void attributeReplaced(HttpSessionBindingEvent event);

}

7.HttpSessionActivationListener 

public interface HttpSessionActivationListener extends EventListener { 

    // 钝化
    public void sessionWillPassivate(HttpSessionEvent se); 

    // 活化
    public void sessionDidActivate(HttpSessionEvent se);
}