这个是springboot整合关联cas的版本-------------个人觉得差不多

1.cas单点登录介绍

单点登录（ Single Sign-On , 简称 SSO ）是目前比较流行的服务于企业业务整合的解决方案之一， SSO 使得在多个应用系统中，用户只需要登录一次就可以访问所有相互信任的应用系统。
从结构体系看， CAS 包括两部分： CAS Server 和 CAS Client 。
CAS Server
CAS Server 负责完成对用户的认证工作 , 需要独立部署 , CAS Server 会处理用户名 / 密码等凭证(Credentials) 。
CAS Client
负责处理对客户端受保护资源的访问请求，需要对请求方进行身份认证时，重定向到 CAS Server 进行认证。（原则上，客户端应用不再接受任何的用户名密码等 Credentials ）。
CAS Client 与受保护的客户端应用部署在一起，以 Filter 方式保护受保护的资源。
2.cas下载编译

jasig cas下载官网地址 https://www.apereo.org/projects/cas
github项目下载地址 https://github.com/apereo/cas/releases

我使用下载的是cas-4.1.10是maven构建的项目，如果你要下cas-4.2以上的版本可能就是gradle构建的项目，如果你常用的是gradle，那就下载cas-4.2以上的版本，这里比较坑的就是cas的编译。

将下载的项目解压后，进入到项目目录里使用mvn clean install 进行编译，这里会等待很时间，如果你没用翻墙可能有些jar包下载不下来，如果编译不了就在网上找别人编译后的项目，我在编译的时候就一直编译不了，下载太慢，坑了我很长时间。

编译后将cas-server-webapp项目下的targer的war包放到tomcat的里，启动tomcat。这里的详细步骤可以参考
Jasig cas 单点登录系统Server&Java Client配置

这里的搭建cas server一端就不详细说了，下面主要说说与spring boot的结合配置

3.spring boot的配置

这里需要你有一个spring boot的项目，如何搭建可以参考网上的教程。

引入jar包

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-cas</artifactId>
</dependency>
<dependency>
<groupId>javax.inject</groupId>
<artifactId>javax.inject</artifactId>
<version>1</version>
</dependency>

有过spring security的经验的应该知道关于权限登陆的用法，实现AuthenticationUserDetailsService 接口或UserDetailsService 接口，用作登陆验证。

import org.springframework.security.cas.authentication.CasAssertionAuthenticationToken;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.userdetails.AuthenticationUserDetailsService;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UsernameNotFoundException;

import java.util.ArrayList;
import java.util.List;

/**
* Authenticate a user from the database.
*/
public class CustomUserDetailsService implements AuthenticationUserDetailsService<CasAssertionAuthenticationToken> {

@Override
public UserDetails loadUserDetails(CasAssertionAuthenticationToken token) throws UsernameNotFoundException {
String login = token.getPrincipal().toString();
String username = login.toLowerCase();

List<GrantedAuthority> grantedAuthorities = new ArrayList<GrantedAuthority>();
grantedAuthorities.add(new SimpleGrantedAuthority("ROLE_ADMIN"));

return new AppUserDetails(username, grantedAuthorities);
}

}

然后就用到了userDetails 接口，我们这里实现这个接口，并定义一些关于用户的信息和权限。如果你在clien要使用这些信息，比如用户名，角色，权限等信息，你可以在这里处理一下。

package com.shang.spray.security;

import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.userdetails.UserDetails;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.function.Function;
import java.util.stream.Collectors;

public class AppUserDetails implements UserDetails {

/** */
private static final long serialVersionUID = -4777124807325532850L;

private String username;

private String password;

private boolean accountNonExpired;

private boolean accountNonLocked;

private boolean credentialsNonExpired;

private boolean enabled;

private Collection<? extends GrantedAuthority> authorities;

private List<String> roles;

public AppUserDetails() {
super();
}

public AppUserDetails(String username, Collection<? extends GrantedAuthority> authorities) {
super();
this.username = username;
this.password = "";
this.accountNonExpired = true;
this.accountNonLocked = true;
this.credentialsNonExpired = true;
this.enabled = true;
this.authorities = authorities;
this.roles = new ArrayList<>();
this.roles.addAll(authorities.stream().map((Function<GrantedAuthority, String>) GrantedAuthority::getAuthority).collect(Collectors.toList()));
}

@Override
public Collection<? extends GrantedAuthority> getAuthorities() {
/*
* List<GrantedAuthority> l = new ArrayList<GrantedAuthority>(); l.add(new
* GrantedAuthority() { private static final long serialVersionUID = 1L;
*
* @Override public String getAuthority() { return "ROLE_AUTHENTICATED"; } }); return l;
*/
return authorities;
}

@Override
public String getPassword() {
return password;
}

@Override
public String getUsername() {
return username;
}

@Override
public boolean isAccountNonExpired() {
return accountNonExpired;
}

@Override
public boolean isAccountNonLocked() {
return accountNonLocked;
}

@Override
public boolean isCredentialsNonExpired() {
return credentialsNonExpired;
}

@Override
public boolean isEnabled() {
return enabled;
}

}

接下来就是最重要的一个步骤，继承实现WebSecurityConfigurerAdapter 配置类，并配置关于单点登录服务器的一些信息和拦截页面。这里先放上这个实现类

package com.shang.spray.security;

import org.jasig.cas.client.session.SingleSignOutFilter;
import org.jasig.cas.client.validation.Cas20ServiceTicketValidator;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.env.Environment;
import org.springframework.security.cas.ServiceProperties;
import org.springframework.security.cas.authentication.CasAssertionAuthenticationToken;
import org.springframework.security.cas.authentication.CasAuthenticationProvider;
import org.springframework.security.cas.web.CasAuthenticationEntryPoint;
import org.springframework.security.cas.web.CasAuthenticationFilter;
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.core.userdetails.AuthenticationUserDetailsService;
import org.springframework.security.web.authentication.logout.LogoutFilter;
import org.springframework.security.web.authentication.logout.SecurityContextLogoutHandler;
import org.springframework.security.web.util.matcher.AntPathRequestMatcher;

import javax.inject.Inject;

@Configuration
@EnableWebSecurity
public class WebSecurityConfiguration extends WebSecurityConfigurerAdapter {

private static final String CAS_URL_LOGIN = "cas.service.login";
private static final String CAS_URL_LOGOUT = "cas.service.logout";
private static final String CAS_URL_PREFIX = "cas.url.prefix";
private static final String CAS_SERVICE_URL = "app.service.security";
private static final String APP_SERVICE_HOME = "app.service.home";

@Inject
private Environment env;

@Bean
public ServiceProperties serviceProperties() {
ServiceProperties sp = new ServiceProperties();
sp.setService(env.getRequiredProperty(CAS_SERVICE_URL));
sp.setSendRenew(false);
return sp;
}

@Bean
public CasAuthenticationProvider casAuthenticationProvider() {
CasAuthenticationProvider casAuthenticationProvider = new CasAuthenticationProvider();
casAuthenticationProvider.setAuthenticationUserDetailsService(customUserDetailsService());
casAuthenticationProvider.setServiceProperties(serviceProperties());
casAuthenticationProvider.setTicketValidator(cas20ServiceTicketValidator());
casAuthenticationProvider.setKey("an_id_for_this_auth_provider_only");
return casAuthenticationProvider;
}

@Bean
public AuthenticationUserDetailsService<CasAssertionAuthenticationToken> customUserDetailsService() {
return new CustomUserDetailsService();
}

@Bean
public Cas20ServiceTicketValidator cas20ServiceTicketValidator() {
return new Cas20ServiceTicketValidator(env.getRequiredProperty(CAS_URL_PREFIX));
}

@Bean
public CasAuthenticationFilter casAuthenticationFilter() throws Exception {
CasAuthenticationFilter casAuthenticationFilter = new CasAuthenticationFilter();
casAuthenticationFilter.setAuthenticationManager(authenticationManager());
casAuthenticationFilter.setFilterProcessesUrl("/j_spring_cas_security_check");
return casAuthenticationFilter;
}

@Bean
public CasAuthenticationEntryPoint casAuthenticationEntryPoint() {
CasAuthenticationEntryPoint casAuthenticationEntryPoint = new CasAuthenticationEntryPoint();
casAuthenticationEntryPoint.setLoginUrl(env.getRequiredProperty(CAS_URL_LOGIN));
casAuthenticationEntryPoint.setServiceProperties(serviceProperties());
return casAuthenticationEntryPoint;
}

@Bean
public SingleSignOutFilter singleSignOutFilter() {
SingleSignOutFilter singleSignOutFilter = new SingleSignOutFilter();
singleSignOutFilter.setCasServerUrlPrefix(env.getRequiredProperty(CAS_URL_PREFIX));
return singleSignOutFilter;
}

@Bean
public LogoutFilter requestCasGlobalLogoutFilter() {
LogoutFilter logoutFilter = new LogoutFilter(env.getRequiredProperty(CAS_URL_LOGOUT) + "?service="
+ env.getRequiredProperty(APP_SERVICE_HOME), new SecurityContextLogoutHandler());
logoutFilter.setLogoutRequestMatcher(new AntPathRequestMatcher("/logout", "POST"));
return logoutFilter;
}

@Override
protected void configure(AuthenticationManagerBuilder auth) throws Exception {
auth.authenticationProvider(casAuthenticationProvider());
}

@Override
protected void configure(HttpSecurity http) throws Exception {
http.addFilter(casAuthenticationFilter());
http.exceptionHandling().authenticationEntryPoint(casAuthenticationEntryPoint());
http.addFilterBefore(singleSignOutFilter(), CasAuthenticationFilter.class)
.addFilterBefore(requestCasGlobalLogoutFilter(), LogoutFilter.class);

http.csrf().disable();
http.headers().frameOptions().disable();
http.authorizeRequests().antMatchers("/assets/**").permitAll()
.anyRequest().authenticated();

http.logout().logoutUrl("/logout").logoutSuccessUrl("/").invalidateHttpSession(true)
.deleteCookies("JSESSIONID");
}
}

配置信息

#cas
app.service.security=http://localhost:8200/j_spring_cas_security_check
app.service.home=http://localhost:8200

cas.service.login=http://localhost:8080/cas/login
cas.service.logout=http://localhost:8080/cas/logout
cas.url.prefix=http://localhost:8080/cas

关于上面的一些说明：

serviceProperties单点登录服务器地址
casAuthenticationProvider 权限登录配置
客户端登录地址和退出地址的配置
客户端拦截的路径配置
配置后需要启用配置@Configuration 和@EnableWebSecurity
4.结束

以上单点登录cas与spring boot的配置使用，对于有多个后台的系统，写一个单独的单点登录系统来对所有的平台来管理感觉非常有必要。没有使用过的可以去尝试一下，简单好用你值的一学。

这个是springboot整合关联cas的版本-------------个人觉得差不多

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