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最新推荐文章于 2024-05-22 22:27:20 发布

wicycc

最新推荐文章于 2024-05-22 22:27:20 发布

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分类专栏： java jsp&servlet

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<span style="font-family: Arial, Helvetica, sans-serif;">package com.ruanku.filter;</span>


import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

public class LoginFilter implements Filter{

	public void destroy() {
		// TODO Auto-generated method stub
		
	}

	public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse,
			FilterChain filterChain) throws IOException, ServletException {
		HttpServletRequest request=(HttpServletRequest)servletRequest;
		HttpSession session=request.getSession();
		Object o=session.getAttribute("currentUser");
		String path=request.getServletPath();
		if(o==null&&path.indexOf("login")<0){
			request.getRequestDispatcher("login.jsp").forward(servletRequest, servletResponse);
		}else{
			filterChain.doFilter(servletRequest, servletResponse);
		}
	}

	public void init(FilterConfig arg0) throws ServletException {
		// TODO Auto-generated method stub
		
	}

}

过滤器 LoginFilter

package com.ruanku.listener;

import javax.servlet.http.HttpSessionAttributeListener;
import javax.servlet.http.HttpSessionBindingEvent;

public class SessionAttributeListener implements HttpSessionAttributeListener{

	public void attributeAdded(HttpSessionBindingEvent httpSessionBindingEvent) {
		System.out.println("添加属性名:"+httpSessionBindingEvent.getName()+",属性值"+httpSessionBindingEvent.getValue());
	}

	public void attributeRemoved(HttpSessionBindingEvent httpSessionBindingEvent) {
		// TODO Auto-generated method stub
		System.out.println("删除属性名:"+httpSessionBindingEvent.getName()+",属性值"+httpSessionBindingEvent.getValue());
	}

	public void attributeReplaced(HttpSessionBindingEvent httpSessionBindingEvent) {
		// TODO Auto-generated method stub
		
	}

}

listener监听器

SessionAttributeListener.java

main.jsp改动

<body>
主页！当前登录用户：${currentUser.userName }   <a href="logout">注销</a>
</body>

Logout.java

package com.ruanku.web;

import java.io.IOException;
import java.sql.Connection;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import com.ruanku.dao.UserDao;
import com.ruanku.model.User;
import com.ruanku.util.DbUtil;

public class LogoutServlet extends HttpServlet{

	

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	@Override
	protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		this.doPost(request, response);
	}

	@Override
	protected void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		request.getSession().invalidate();
		response.sendRedirect("login.jsp");
	}
	
	
}

xml配置

	 <listener>
  	<listener-class>
  		com.ruanku.listener.SessionAttributeListener
  	</listener-class>
  </listener>

	<filter>
	<filter-name>loginFilter</filter-name>
	<filter-class>com.ruanku.filter.LoginFilter</filter-class>
	</filter>
	
	<filter-mapping>
	<filter-name>loginFilter</filter-name>
	<url-pattern>/*</url-pattern>
	</filter-mapping>

	<servlet>
  	<servlet-name>logoutServlet</servlet-name>
  	<servlet-class>com.ruanku.web.LogoutServlet</servlet-class>
  </servlet>
  
  <servlet-mapping>
  	<servlet-name>logoutServlet</servlet-name>
  	<url-pattern>/logout</url-pattern>
  </servlet-mapping>

信息: Server startup in 700 ms
添加属性名:currentUser,属性值com.ruanku.model.User@3ac11b
删除属性名:currentUser,属性值com.ruanku.model.User@3ac11b

success!!!!!