1. 导入cas客户端架包
<!-- https://mvnrepository.com/artifact/org.jasig.cas.client/cas-client-core -->
<dependency>
<groupId>org.jasig.cas.client</groupId>
<artifactId>cas-client-core</artifactId>
<version>3.5.0</version>
</dependency>
2. 添加过滤器
<!-- ==============================================单点登录开始==================================== -->
<!-- 用于单点退出，该过滤器用于实现单点登出功能 -->
<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 -->
<filter>
<filter-name>CAS Single Sign Out Filter</filter-name>
<filter-class>org.jasig.cas.client.session.SingleSignOutFilter</filter-class>
</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,casServerLoginUrl：cas服务端登录地址(注意这里比上面的多了'/login') -->
<filter>
<filter-name>CAS Filter</filter-name>
<filter-class>org.jasig.cas.client.authentication.AuthenticationFilter</filter-class>
<init-param>
<param-name>casServerLoginUrl</param-name>
<param-value>https://域名:8443/cas/login</param-value>
</init-param>
<init-param>
<param-name>serverName</param-name>
<param-value>http://localhost:8080</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>CAS Filter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- 该过滤器负责对Ticket的校验工作 -->
<filter>
<filter-name>CAS Validation Filter</filter-name>
<filter-class>
org.jasig.cas.client.validation.Cas10TicketValidationFilter</filter-class>
<init-param>
<param-name>casServerUrlPrefix</param-name>
<param-value>https://域名:8443/cas</param-value>
</init-param>
<init-param>
<param-name>serverName</param-name>
<param-value>http://localhost:8080</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>CAS Validation Filter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- ==========================================可选配置开始======================================= -->
<!--
该过滤器负责实现HttpServletRequest请求的包裹，比如允许开发者通过HttpServletRequest的getRemoteUser()方法获得SSO登录用户的登录名。
HttpServletRequest request2 = (HttpServletRequest) request;
// 从Cas服务器获取登录账户的用户名（2种方式）
String username1 = request2.getUserPrincipal().toString();
String username2 = request2.getRemoteUser();
-->
<filter>
<filter-name>CAS HttpServletRequest Wrapper Filter</filter-name>
<filter-class>org.jasig.cas.client.util.HttpServletRequestWrapperFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>CAS HttpServletRequest Wrapper 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()。
Assertion assertion = AssertionHolder.getAssertion();
String userName = assertion.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>
<!-- ==========================================可选配置结束======================================= -->
<!-- ==============================================单点登录结束==================================== -->
3. 客户端导入证书
不导入证书会出现以下错误
javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
keytool -import -keystore %JAVA_HOME%\jre\lib\security\cacerts -file 证书存放目录\cas.crt -alias cas
注：这里JAVA_HOME指代的路径中不能有空格，如有空格则切换到security目录下，
keytool -import -alias cas -keystore cacerts -file 证书存放目录\cas.crt
4. 测试
这时会出现URL中带有jsessionid而无法跳到正确页面
解决办法：
在web.xml中添加
<session-config>
<tracking-mode>COOKIE</tracking-mode>
</session-config>
Servlet3.0规范中的<tracking-mode>允许你定义JSESSIONID是存储在cookie中还是URL参数中。如果会话ID存储在URL中，那么它可能会被无意的存储在多个地方，包括浏览器历史、代理服务器日志、引用日志和web日志等。暴露了会话ID使得网站被session劫持攻击的几率大增。然而，确保JSESSIONID被存储在cookie中非常容易
5. 配置域名
编辑C:\Windows\System32\drivers\etc\hosts文件
windows主机ip 域名
