web.xml加入listener报错

2009-12-12 08:22:06 833 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

一文搞懂Servlet、Filter和Listener的请求响应机制在Java Web应用开发中，每一次HTTP请求的响应链路都离不开Servlet容器对请求对象和响应对象的调度。Servlet、Filter与Listener是规范中最核心的三类组件：Servlet负责业务处理，Filter在请求前后进行拦截过滤，Listener监听容器与对象生命周期。理解它们的协作机制，有助于从底层看清Spring Boot等框架的封装逻辑，也能更有效地应对中文乱码、文件上传解析失败、Filter不生效等高频工程问题。无论是纯Servlet项目还是现代框架集成，掌握HttpServlet 阅读详情

想在web.xml中加入个监听器，加载的类是实现HttpSessionListener借口。想实现当Session过期后，监听器会调用实现类中的Session 过期方法。
实现类：

package org.cric.bboa.action.user;



import javax.annotation.Resource;

import javax.servlet.http.HttpSession;

import javax.servlet.http.HttpSessionEvent;

import javax.servlet.http.HttpSessionListener;



import org.cric.bboa.dao.manpowerResource.EmployeeDao;

import org.cric.bboa.model.manpowerResource.Employee;



public class SessionListener implements HttpSessionListener {

	@Resource EmployeeDao employeeDaoImpl;

	@Override

	public void sessionCreated(HttpSessionEvent arg0) {

		HttpSession session=arg0.getSession();



	}



	@Override

	public void sessionDestroyed(HttpSessionEvent arg0) {

		HttpSession session= arg0.getSession();

		Employee user=(Employee)session.getAttribute("user");

		if(user!=null){

			user.setMark(0);

			this.employeeDaoImpl.update(user);

			session.removeAttribute("user");

		}

	}



}

配置文件web.xml

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

	xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"

	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"

	id="WebApp_ID" version="2.5">

	<display-name>bboa</display-name>

	<welcome-file-list>

		<welcome-file>HX_Login.jsp</welcome-file>

	</welcome-file-list>

	<listener>

	<description>HttpSessionListener</description>

		<listener-class>org.cric.bboa.action.user.SessionListener</listener-class>

	</listener>   

	

	

	<!-- 验证码 -->

	<servlet>

		<servlet-name>authimg</servlet-name>

		<servlet-class>org.cric.bboa.web.AuthImg</servlet-class>

	</servlet>

	<servlet-mapping>

		<servlet-name>authimg</servlet-name>

		<url-pattern>/authImg</url-pattern>

	</servlet-mapping>



	<!--session过期时间 -->

	<session-config>

		<session-timeout>5</session-timeout>

	</session-config>

</web-app>

运行服务器时候产生错误：
严重: Error configuring application listener of class org.cric.bboa.action.user.SessionListener
javax.naming.NameNotFoundException: Name org.cric.bboa.action.user.SessionListener is not bound in this Context

请老鸟们指教！！！

...全文