一、搭建cas服务器
官网：http://jasig.github.io/cas/ Cas Server
下载：http://developer.jasig.org/cas/ Cas Client
下载：http://developer.jasig.org/cas-clients/
测试环境： jdk：java version "1.8.0_60"
tomcat：apache-tomcat-7.0.65
mysql：mysql5.5.40
CAS Server：cas-server-4.0.0-release.zip
CAS Client：cas-client-3.1.12-release.zip
一、生成证书 1、生成证书： keytool -genkey -alias castest -keyalg RSA -keystore F:/keys/castest 生成一个别名为castest的证书。
此处需要特别注意口令（后续导入导出证书、CAS服务器端均要用到此口类）和“名字与姓氏”（为CAS跳转域名，否则会报错）
2.导出证书： keytool -export -file F:/keys/castest.crt -alias castest -keystore F:/keys/castest
3.将证书导入到客户端JRE中（注意、是导入JRE中），如果security中已经存在cacerts，需要先将其删除。
导入命令： Keytool -import -keystore "D:\Program Files\Java\jdk1.8.0_60\jre\lib\security\cacerts" -file F:/keys/castest.crt -alias castest
删除命令：keytool -delete -alias emailcert -keystore D:\Program Files\Java\jdk1.8.0_60\jre\lib\security\cacerts"
二、配置服务器端 1、从http://developer.jasig.org/cas/上下载cas服务器端cas-server-4.0.0-release.zip，在modules目录下找到cas-server-webapp-4.0.0.war，将其复制到%TOMCAT_HOME%\webapps下，并将名称改为cas.war
2、修改%TOMCAT_HOME%\conf\server.xml文件，去掉此文件83到93行之间的注释，修改为： <Connector SSLEnabled="true" clientAuth="false" keystoreFile="F:/keys/castest" <!—生成证书时的路径，证书名--> keystorePass="castest" <!—证书密码--> maxThreads="150" port="8443" protocol="org.apache.coyote.http11.Http11Protocol" scheme="https" secure="true" sslProtocol="TLS"/>
点击继续浏览此网页
如果此时可以正常访问，说明证书安装成功 https://localhost:8443/cas/login，出现
输入账号和密码 casuser Mellon
此时说明服务器端已经配置成功。可通过https://localhost:8443/cas/logout退出登录
二、cas配置客户端
1从http://developer.jasig.org/cas-clients/上下载cas-client-3.1.12-release.zip，在modules目录下找到cas-client-core-3.1.12.ja、commons-collections-3.2.jar、commons-logging-1.1.jar复制到项目WEB-INF/lib下
2. 添加映射域名，在C:\Windows\System32\drivers\etc\hosts文件中添加 127.0.0.1 sso.castest.com
3. 创建web项目CasClient，并在项目的web.xml配置过滤器
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<display-name>cas-demo</display-name>
<!-- ======================== 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，可选配置-->
<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>
</filter>
<filter-mapping>
<filter-name>CAS Single Sign Out Filter</filter-name>
<url-pattern>/CasClient/*</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>https://sso.castest.com:8443/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://localhost: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>https://sso.castest.com:8443/cas/</param-value><!-- 此处必须为登录url/cas/，带有任何其它路径都会报错，如“https://sso.castest.com:8443/cas/login”,这样也会报错。 -->
</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>
<!--
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，可选配置。
-->
<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()。
-->
<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>
<!-- ======================== 单点登录结束 ======================== -->
<!-- session超时定义,单位为分钟 -->
<session-config>
<session-timeout>2</session-timeout>
</session-config>
</web-app>
4、此时访问http://localhost:8080/CasClient/Index.jsp时会自动跳转到sso.castest.com下去登录
三、配置cas服务器数据源
1、在mysql中新建一个cas数据库并创建user表
CREATE DATABASE /*!32312 IF NOT EXISTS*/`cas` /*!40100 DEFAULT CHARACTER SET gbk */;
USE `cas`;
/*Table structure for table `user` */
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(255) NOT NULL,
`password` varchar(255) NOT NULL,
`used` tinyint(2) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=MyISAM AUTO_INCREMENT=2 DEFAULT CHARSET=gbk;
/*Data for the table `user` */
insert into `user`(`id`,`name`,`password`,`used`) values (1,'casuser','9414f9301cdb492b4dcd83f8c711d8bb',1);
2、CAS的HTTP模式与HTTPS设置（可省略）
1）cas\WEB-INF\deployerConfigContext.xml，新增p:requireSecure="false"
<bean id="proxyAuthenticationHandler" class="org.jasig.cas.authentication.handler.support.HttpBasedServiceCredentialsAuthenticationHandler"
p:httpClient-ref="httpClient" p:requireSecure="false"/>
2）cas\WEB-INF\spring-configuration
ticketGrantingTicketCookieGenerator.xml设置p:cookieSecure="false"
warnCookieGenerator.xml设置p:cookieSecure="false"
http://localhost:8080/cas/login，进入登录页面。 默认用户为casuser/Mellon，登录成功即配置完成。
3、设置利用数据库来验证用户
依赖包：
c3p0-0.9.1.2.jar
mysql-connector-java-5.1.21.jar
cas-server-support-jdbc-4.0.0.jar
mchange-commons-java-0.2.11.jar
cas\WEB-INF\deployerConfigContext.xml
1）更换验证方式
<!--
<bean id="primaryAuthenticationHandler"
class="org.jasig.cas.authentication.AcceptUsersAuthenticationHandler">
<property name="users">
<map>
<entry key="casuser" value="Mellon"/>
</map>
</property>
</bean>
-->
<!-- Define the DB Connection -->
<bean id="dataSource"
class="com.mchange.v2.c3p0.ComboPooledDataSource"
p:driverClass="com.mysql.jdbc.Driver"
p:jdbcUrl="jdbc:mysql://127.0.0.1:3306/cas?useUnicode=true&characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull"
p:user="root"
p:password="root" />
<!-- Define the encode method-->
<!--<bean id="passwordEncoder"
class="org.jasig.cas.authentication.handler.DefaultPasswordEncoder" autowire="byName">
<constructor-arg value="MD5"/>
</bean> -->
<bean id="passwordEncoder"
class="org.jasig.cas.authentication.handler.DefaultPasswordEncoder"
c:encodingAlgorithm="MD5"
p:characterEncoding="UTF-8" />
<bean id="dbAuthHandler"
class="org.jasig.cas.adaptors.jdbc.QueryDatabaseAuthenticationHandler"
p:dataSource-ref="dataSource"
p:sql="select password from user where name=? and used=1"
p:passwordEncoder-ref="passwordEncoder"/>
<!-- p:passwordEncoder-ref="passwordEncoder" -->
2）更换验证Handle
<bean id="authenticationManager" class="org.jasig.cas.authentication.PolicyBasedAuthenticationManager">
<constructor-arg>
<map>
<!--
| IMPORTANT
| Every handler requires a unique name.
| If more than one instance of the same handler class is configured, you must explicitly
| set its name to something other than its default name (typically the simple class name).
-->
<entry key-ref="proxyAuthenticationHandler" value-ref="proxyPrincipalResolver" />
<entry key-ref="dbAuthHandler" value-ref="primaryPrincipalResolver" />
<!-- <entry key-ref="primaryAuthenticationHandler" value-ref="primaryPrincipalResolver" /> -->
</map>
</constructor-arg>
http://localhost:8080/cas，进入登录页面。如果没有配置http登录，则需要通过http://localhost:8443/cas进行访问 默认用户为casuser/Mellon，登录成功即配置完成。