SpringSecurity3整合CAS实现单点登录

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SpringSecurity本身已经做好了与CAS的集成工作，只需要我们做简单配置就可以了

步骤1 spring-cas.xml配置文件内容如下(完整版)

1. <?xml version="1.0" encoding="UTF-8"?> 
2. <beans:beans xmlns="http://www.springframework.org/schema/security" 
3.     xmlns:context="http://www.springframework.org/schema/context" 
4.     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" 
5.     xmlns:beans="http://www.springframework.org/schema/beans" 
6.     xsi:schemaLocation="  http://www.springframework.org/schema/context  http://www.springframework.org/schema/context/spring-context-2.5.xsd  
7.            http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd    
8.            http://www.springframework.org/schema/security http://www.springframework.org/schema/security/spring-security-3.0.xsd"  
9.     default-lazy-init="true"> 
10.     <context:component-scan base-package="com.itec.core" /> 
11. <!--SSO --> 
12.     <http auto-config="false" entry-point-ref="casEntryPoint" servlet-api-provision="true">    
13.         <intercept-url pattern="/login.do" filters="none" /> 
14.         <intercept-url pattern="/image.do" filters="none" /> 
15.         <intercept-url pattern="/admin/*.do*" access="ROLE_LOGIN" />   
16.         <!-- logout-success-url="/login.html" -->    
17. <!--        <logout logout-url="/login.do" success-handler-ref="casLogoutSuccessHandler"/>   --> 
18.         <custom-filter ref="requestSingleLogoutFilter" before="LOGOUT_FILTER" />   
19.         <custom-filter position="FORM_LOGIN_FILTER" ref="casFilter"/>    
20.         <custom-filter ref="singleLogoutFilter" before="CAS_FILTER" /> 
21.     </http>   
22.  
23.     <beans:bean id="casEntryPoint"  class="org.springframework.security.cas.web.CasAuthenticationEntryPoint">    
24.         <beans:property name="loginUrl" value="http://172.19.50.21:9083/HASLSSO/login"/>    
25.         <beans:property name="serviceProperties" ref="serviceProperties"/>    
26.     </beans:bean> 
27.     <beans:bean id="serviceProperties"  class="org.springframework.security.cas.ServiceProperties">    
28.         <beans:property name="service"  value="http://172.19.4.225:8080/HACMS/j_spring_cas_security_check"/>    
29.         <beans:property name="sendRenew" value="false"/>    
30.     </beans:bean> 
31.  
32.     <beans:bean id="casFilter"  class="org.springframework.security.cas.web.CasAuthenticationFilter">    
33.         <beans:property name="authenticationManager" ref="authenticationManager"/>    
34.     </beans:bean>    
35.         
36.     <authentication-manager alias="authenticationManager">    
37.         <authentication-provider ref="casAuthenticationProvider"/>   
38.     </authentication-manager>    
39.         
40.     <beans:bean id="casAuthenticationUserDetailsService" class="org.springframework.security.core.userdetails.UserDetailsByNameServiceWrapper">    
41.         <beans:property name="userDetailsService" >    
42.             <beans:ref bean="userDetailsManager" />    
43.         </beans:property>    
44.     </beans:bean>    
45.        
46.     <beans:bean id="casAuthenticationProvider"    
47.             class="org.springframework.security.cas.authentication.CasAuthenticationProvider">    
48.         <beans:property name="authenticationUserDetailsService" ref="casAuthenticationUserDetailsService"/>    
49.         <beans:property name="serviceProperties" ref="serviceProperties" />    
50.         <beans:property name="ticketValidator">    
51.             <beans:bean class="org.jasig.cas.client.validation.Cas20ServiceTicketValidator">    
52.                 <beans:constructor-arg index="0" value="http://172.19.50.21:9083/HASLSSO" />    
53.             </beans:bean>    
54.         </beans:property>    
55.         <beans:property name="key" value="an_id_for_this_auth_provider_only"/>    
56.     </beans:bean>    
57.  
58.     <!-- 注销客户端 --> 
59.     <beans:bean id="singleLogoutFilter" class="org.jasig.cas.client.session.SingleSignOutFilter" /> 
60.  
61.     <!-- 注销服务器端 --> 
62.     <beans:bean id="requestSingleLogoutFilter" 
63.     class="org.springframework.security.web.authentication.logout.LogoutFilter"> 
64.     <beans:constructor-arg 
65.     value="http://172.19.50.21:9083/HASLSSO/logout" /> 
66.     <beans:constructor-arg> 
67.     <beans:bean 
68.     class="org.springframework.security.web.authentication.logout.SecurityContextLogoutHandler"/> 
69.     </beans:constructor-arg> 
70.     <beans:property name="filterProcessesUrl" value="/j_spring_cas_security_logout" /> 
71.     </beans:bean> 
72.  
73. </beans:beans>    

步骤2 之前的UserDetailsManager不需要改任何代码

1. @Service 
2. public class UserDetailsManager implements UserDetailsService { 

步骤3 web.xml需要修改一点东西，不加载Security的配置文件就行了

1. <context-param> 
2.         <param-name>contextConfigLocation</param-name> 
3.         <!-- 使用工程本身验证 --> 
4.         <param-value>/WEB-INF/spring-config.xml,/WEB-INF/spring-freemarker.xml,/WEB-INF/spring-jpa.xml,/WEB-INF/spring-security.xml</param-value> 
5.         <!-- 使用 SSO 验证 --> 
6. <!--        <param-value>/WEB-INF/spring-config.xml,/WEB-INF/spring-freemarker.xml,/WEB-INF/spring-jpa.xml,/WEB-INF/spring-cas.xml</param-value> --> 
7.     </context-param> 

大功告成~！