1、使用Cookie解决单点登录
技术点:
1、设置Cookie的路径为setPath("/").即Tomcat的目录下都有效
2、设置Cookie的域setDomain(".itcast.com");即bbs.itcast.com,或是mail.itcast.com有效。即跨域。
3、设置Cookie的时间。即使用户不选择在几天内自动登录,也应该保存Cookie以保存在当前浏览器没有关闭的情况下有效。
4、使用Filter自动登录。
实现步骤
1:首先要准备出几个虚拟主机并配置hosts文件,即本机DNS修改本机的C:WindowsSystem32driversetc下的hosts文件。
- <span style="font-size:18px;"><span style="font-size:18px;"># localhost name resolution is handled within DNS itself.
- # 127.0.0.1 localhost
- # ::1 localhost
- 127.0.0.1 localhost
- 127.0.0.1 www.bbs.itcast.cn
- 127.0.0.1 www.news.itcast.cn
- 127.0.0.1 www.news.com
- 127.0.0.1 www.bbs.com
- 127.0.0.1 www.server.com
- </span></span>
增加几个Host节点,通过Cookie实现自动登录,必须配置的虚拟主页满足xxx.itcast.cn,即主域名必须保持一致。
一般web应用中一般部署在web.xml文件中,单点退出相关配置如下:
- <span style="font-size:18px;"><span style="font-size:18px;"><filter>
- <filter-name>CAS Authentication Filter</filter-name>
- <filter-class>org.jasig.cas.client.authentication.AuthenticationFilter</filter-class>
- <init-param>
- <!--到哪去登录-->
- <param-name>casServerLoginUrl</param-name>
- <param-value>http://www.server.com:8080/login</param-value>
- </init-param>
- <init-param>
- <!--我是谁-->
- <param-name>serverName</param-name>
- <param-value>http://www.bbs.com:8080</param-value>
- </init-param>
- <init-param>
- <param-name>renew</param-name>
- <param-value>false</param-value>
- </init-param>
- <init-param>
- <param-name>gateway</param-name>
- <param-value>false</param-value>
- </init-param>
- </filter>
- <filter>
- <filter-name>CAS Validation Filter</filter-name>
- <filter-class>org.jasig.cas.client.validation.Cas20ProxyReceivingTicketValidationFilter</filter-class>
- <init-param>
- <param-name>casServerUrlPrefix</param-name>
- <param-value>http://www.server.com:8080</param-value>
- </init-param>
- <init-param>
- <param-name>serverName</param-name>
- <param-value>http://www.bbs.com:8080</param-value>
- </init-param>
- <!--
- <init-param>
- <param-name>proxyCallbackUrl</param-name>
- <param-value>https://localhost:8443/mywebapp/proxyCallback</param-value>
- </init-param>
- <init-param>
- <param-name>proxyReceptorUrl</param-name>
- <param-value>/mywebapp/proxyCallback</param-value>
- </init-param>
- -->
- </filter>
- <filter>
- <filter-name>CAS HttpServletRequest Wrapper Filter</filter-name>
- <filter-class>org.jasig.cas.client.util.HttpServletRequestWrapperFilter</filter-class>
- </filter>
- <filter>
- <filter-name>CAS Assertion Thread Local Filter</filter-name>
- <filter-class>org.jasig.cas.client.util.AssertionThreadLocalFilter</filter-class>
- </filter>
- <!-- ************************* -->
- <!-- Sign out not yet implemented -->
- <!--
- <filter-mapping>
- <filter-name>CAS Single Sign Out Filter</filter-name>
- <url-pattern>/*</url-pattern>
- </filter-mapping>
- -->
- <filter-mapping>
- <filter-name>CAS Authentication Filter</filter-name>
- <url-pattern>/protected/*</url-pattern>
- </filter-mapping>
- <filter-mapping>
- <filter-name>CAS Validation Filter</filter-name>
- <url-pattern>/*</url-pattern>
- </filter-mapping>
- <filter-mapping>
- <filter-name>CAS HttpServletRequest Wrapper Filter</filter-name>
- <url-pattern>/*</url-pattern>
- </filter-mapping>
- <filter-mapping>
- <filter-name>CAS Assertion Thread Local Filter</filter-name>
- <url-pattern>/*</url-pattern>
- </filter-mapping>
- <filter-mapping>
- <filter-name>CAS Validation Filter</filter-name>
- <url-pattern>/proxyCallback</url-pattern>
- </filter-mapping>
- <!-- *********************** -->
- <!-- Sign out not yet implemented -->
- <!--
- <listener>
- <listener-class>org.jasig.cas.client.session.SingleSignOutHttpSessionListener</listener-class>
- </listener>
- -->
- <!-- *********************** -->
- <welcome-file-list>
- <welcome-file>index.jsp</welcome-file>
- </welcome-file-list></span></span>
说明:我们看到单点退出的相关类结构,web.xml配置了单点退出的相关类(1个监听器SingleSignOutHttpSessionListener,2个过滤器SingleSignOutFilter,SimpleServerLogoutHandler)。
实现利用了session存储机制,SessionStoreManager是个单例类,用于管理session的存储、删除;SessionMappingStorage是session的存储、删除的执行者,可以看到实际存储的结构是一个artifactId、sessionId为名值对的HashMap表;监听器SingleSignOutHttpSessionListener的作用是session销毁时,调用session管理单例类SessionStoreManager进行session的删除销毁;
SingleSignOutFilter的作用有2个:一个是在单点访问拦截安全资源时调用单例类SessionStoreManager存储session,另一个是在单点退出时调用单例类SessionStoreManager删除session;SimpleServerLogoutHandler的作用是将客户端的退出请求转发到SSO服务器端,集中处理做各个子系统的单点退出。
2、先在bbs(或是mail)虚拟目录下,开发一个可以自动登录的程序,使用Filter:
- <span style="font-size:18px;"><span style="font-size:18px;">1、登录的主页如下:
- <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
- <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
- <html>
- <head>
- </head>
- <body>
- <p>在同一台服务器上,多个站点自动登录....>>:<%=session.getId()%></p>
- <c:if test="${empty sessionScope.user}">
- <form name="f" method="post" action="<c:url value='/login'/>">
- Name:<input type="text" name="name"/><br/>
- Pwd:<input type="text" name="pwd"/><br/>
- <input type="checkbox" name="chk" value="7">一周内自动登录<br/>
- <input type="submit" value="登录"/>
- </form>
- </c:if>
- <c:if test="${not empty sessionScope.user}">
- 欢迎你:${user}。<a href="<c:url value='/loginout'/>">安全退出</a>
- </c:if>
- <br/>
- 相关站点:(只要在一边登录成功,即可以自动登录到另一个程序)<br/>
- <a href="http://mail.itcast.com:7777">mail.itcast.com</a><br/>
- <a href="http://bbs.itcast.com:7777">bbs.itcast.com</a><br/>
- </body>
- </html>
- </span></span>
2、登录的Servlet程序如下:
- <span style="font-size:18px;"><span style="font-size:18px;">/**
- * 用户登录
- */
- public class LoginServlet extends HttpServlet{
- public void doGet(HttpServletRequest req, HttpServletResponse resp)
- throws ServletException, IOException {
- doPost(req, resp);
- }
- public void doPost(HttpServletRequest req, HttpServletResponse resp)
- throws ServletException, IOException {
- String nm = req.getParameter("name");
- String pwd = req.getParameter("pwd");
- String chk = req.getParameter("chk"); //是否选中了7天自动登录
- String forward = "/index.jsp";
- if(nm!=null && !nm.trim().equals("") && nm.startsWith("it")//用户名是it开始,且密码是pwd开始的可以登录
- && pwd !=null && !pwd.trim().equals("") &&
- pwd.startsWith("pwd")){
- System.err.println("登录成功。。。。。");
- forward = "/jsps/welcome.jsp";
- //无论如何,都要设置cookie,如果没有选择自动登录,则只在当前页面的跳转时有效,否则设置有效期间为7天。
- Cookie cookie = new Cookie("autologin",nm+"@"+pwd);
- cookie.setPath("/"); //如果路径为/则为整个tomcat目录有用
- cookie.setDomain(".itcast.com"); //设置对所有*.itcast.com为后缀的域名效
- if(chk!=null){
- int time = 1*60*60*24*7; //1秒*60=1分*60分=1小时*24=1天*7=7天
- cookie.setMaxAge(time);
- }
- resp.addCookie(cookie);
- req.getSession().setAttribute("user", nm);
- }else{
- System.err.println("登录不成功。。。。。。");
- }
- req.getRequestDispatcher(forward).forward(req, resp);
- }
- }
- </span></span>
3、自动登录的Filter程序如下:
- <span style="font-size:18px;"><span style="font-size:18px;">/**
- * 自动登录
- */
- public class AutoLogin implements Filter {
- public void destroy() {}
- public void doFilter(ServletRequest req, ServletResponse resp,
- FilterChain chain) throws IOException, ServletException {
- System.err.println("开始自动登录验证.....");//此类中应该对登录的servlet直接放行。根据判断url决定。
- HttpServletRequest requ = (HttpServletRequest) req;
- HttpSession s = requ.getSession();
- if (s.getAttribute("user") != null) {//如果用户已经登录则直接放行
- System.err.println("用户已经登录,没有必须要再做自动登录。。。。");
- } else {
- Cookie[] cookies = requ.getCookies();
- if (cookies != null) {
- for (Cookie ck : cookies) {
- if (ck.getName().equals("autologin")) {// 是否是自动登录。。。。
- System.err.println("自动登录成功。。。。。");
- String val = ck.getValue();
- String[] vals = val.split("@");
- s.setAttribute("user", vals[0]);
- }
- }
- }
- }
- chain.doFilter(req, resp);
- }
- public void init(FilterConfig filterConfig) throws ServletException {}
- }
- </span></span>
4、正常退出的Servlet如下
- <span style="font-size:18px;"><span style="font-size:18px;">/**
- * 安全退出删除Cookie
- */
- public class LoginOutServlet extends HttpServlet {
- public void doGet(HttpServletRequest req, HttpServletResponse resp)
- throws ServletException, IOException {
- HttpSession s = req.getSession(); //获取Session
- Cookie cookie = new Cookie("autologin","");//必须声明一个完全相同名称的Cookie
- cookie.setPath("/");//路径也要完全相同
- cookie.setDomain(".itcast.com");//域也要完全相同
- cookie.setMaxAge(0);//设置时间为0,以直接删除Cookie
- resp.addCookie(cookie);
- s.removeAttribute("user");
- System.err.println("安全退出。。。。。");
- resp.sendRedirect(req.getContextPath()+"/index.jsp");
- }
- }
- </span></span>
这种是基于最简单的方式实现的单点登录