应用整合CAS服务器方法

概要

在开发WEB程序时需要整合CAS实现单点登录，下面介绍一下应用整合CAS服务器的过程。

在开始之前，我们确定CAS服务器已经搭建完毕。

实现步骤

1.新建一个maven项目，引入casclient 包。

<dependency>  
         <groupId>org.jasig.cas.client</groupId>  
         <artifactId>cas-client-core</artifactId>  
         <version>3.5.1</version>  
     </dependency>

2.修改web.xml 文件。

<?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" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">
      <display-name>Archetype Created Web Application</display-name>
      <listener>  
         <listener-class>org.jasig.cas.client.session.SingleSignOutHttpSessionListener</listener-class>  
    </listener>  
    <!-- 该过滤器用于实现单点登出功能，可选配置。 -->  
    <filter>
        <filter-name>CAS Single Sign Out Filter</filter-name>  
       <filter-class>org.jasig.cas.client.session.SingleSignOutFilter</filter-class>
        <init-param>  
            <param-name>casServerUrlPrefix</param-name>  
            <param-value>http://192.168.78.118:9000/cas</param-value>
        </init-param>    
    </filter>
    <filter-mapping>  
        <filter-name>CAS Single Sign Out Filter</filter-name>  
        <url-pattern>/*</url-pattern>  
    </filter-mapping>  
    <!-- 该过滤器负责用户的认证工作，必须启用它 -->  
    <filter>  
        <filter-name>CASFilter</filter-name>       
        <filter-class>org.jasig.cas.client.authentication.AuthenticationFilter</filter-class>  
        <init-param>  
            <param-name>casServerLoginUrl</param-name>  
            <param-value>http://192.168.78.118:9000/cas/login</param-value>  
            <!--这里的server是服务端的IP -->  
        </init-param>  
        <init-param>  
            <param-name>serverName</param-name>  
            <param-value>http://192.168.78.118:8080</param-value>
        </init-param>  
    </filter>  
    <filter-mapping>  
        <filter-name>CASFilter</filter-name>  
        <url-pattern>/*</url-pattern>  
    </filter-mapping>  
    <!-- 该过滤器负责对Ticket的校验工作，必须启用它 -->  
    <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://192.168.78.118:9000/cas</param-value>  
        </init-param>
        <init-param>  
            <param-name>serverName</param-name>  
            <param-value>http://192.168.78.118:8080</param-value>
        </init-param>  
    </filter>  
    <filter-mapping>  
        <filter-name>CAS Validation Filter</filter-name>  
        <url-pattern>/*</url-pattern>  
    </filter-mapping>  
 
    <!-- 该过滤器使得开发者可以通过org.jasig.cas.client.util.AssertionHolder来获取用户的登录名。 
        比如AssertionHolder.getAssertion().getPrincipal().getName()。 -->  
    <filter>  
        <filter-name>CAS Assertion Thread Local Filter</filter-name>       
        <filter-class>org.jasig.cas.client.util.AssertionThreadLocalFilter</filter-class>  
    </filter>  
    <filter-mapping>  
        <filter-name>CAS Assertion Thread Local Filter</filter-name>  
        <url-pattern>/*</url-pattern>  
    </filter-mapping>  
</web-app>

cas服务器访问地址：

http://192.168.78.118:9000/cas

平台访问地址前缀：

http://192.168.78.118:8080

3.编写一个index.jsp 页面。

<%@page import="org.jasig.cas.client.util.AssertionHolder"%>
<%@page contentType="text/html; charset=utf-8" %>
<html>
<head>
    <meta charset="utf-8">
</head>
<body>
<h2>欢迎 <%=AssertionHolder.getAssertion().getPrincipal().getName() %></h2>
<a href="http://192.168.78.118:9000/cas/logout?service=http://192.168.78.118:8080/demo">logout</a>
</body>
</html>

该页面实现了登陆后的当前用户账号的获取和用户退出系统登录。