单点登录简介

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百度百科

单点登录分类

一一级域名相同如

www.baidu.com

yun.baidu.com

解决办法 cookie+Filter

二一级域名不同如

www.baidu.com

www.sias.com

Demo1

index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%><%String path = request.getContextPath();String basePath = request.getScheme() + "://"+ request.getServerName() + ":" + request.getServerPort()+ path + "/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><title>My JSP 'index.jsp' starting page</title></head><body><c:choose><c:when test="${not empty sessionScope.user}">   Welcome !  ${sessionScope.user}   </c:when><c:otherwise>   你还没有登录，请先登录：    <form action="<%=path%>/login" method="post">userName:<input type="text" name="userName"><br>password:<input type="password" name="password"><br> <inputtype="submit" value="登录"></form></c:otherwise></c:choose></body></html>

Servlet

public class LoginServlet extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {this.doPost(request, response);}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {String userName = request.getParameter("userName");String password = request.getParameter("password");if(userName != null && password != null){if(userName.equals(password)){//登录成功，实际应查询数据库request.getSession().setAttribute("user", userName);//向客户端写入cookieCookie c = new Cookie("sso",userName);c.setMaxAge(3600);//1小时c.setDomain(".zs.cn");//www.bbs.zs.cn www.news.zs.cnc.setPath("/");//服务器所有目录下所有项目都能访问到这个cookidresponse.addCookie(c);}}response.sendRedirect(request.getContextPath() + "/index.jsp");}}

修改host文件

修改tomcat Server.xml配置文件

新建一个bbs文件夹

新建一个ROOT文件夹

讲 WebRoot复制到Root目录下

访问www.bbs.zs.cn:8080/index.jsp 登录之后

设置一个filter

public class AutoLoginFilter implements Filter {public void destroy() {}public void doFilter(ServletRequest req, ServletResponse resp,FilterChain chain) throws IOException, ServletException {HttpServletRequest request = (HttpServletRequest) req;if(request.getSession().getAttribute("user")== null){Cookie[] cs = request.getCookies();if (cs != null && cs.length > 0) {for (Cookie c : cs) {String cName = c.getName();if (cName.equals("sso")) {String userName = c.getValue();request.getSession().setAttribute("user", userName);}}}}chain.doFilter(request, resp);}public void init(FilterConfig arg0) throws ServletException {}}

<filter><filter-name>autoLogin</filter-name><filter-class>cn.itcast.sso.filter.AutoLoginFilter</filter-class></filter><filter-mapping><filter-name>autoLogin</filter-name><url-pattern>/*</url-pattern></filter-mapping>

再增加一条设置

新建一个news文件夹将bbs的Root复制过来

访问

http://www.news.zs.cn:8080/

登录成功

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