Spring Boot 是一个快速开发框架，它提供了一系列的工具和插件，可以快速构建一个企业级的应用程序。而 Shiro 是一个强大而灵活的安全框架，可以提供身份验证、授权、密码加密、会话管理等功能。CAS 是一个单点登录（SSO）协议，可以实现用户在多个应用系统中使用同一个身份验证。

下面是一个简单的 Spring Boot + Shiro + CAS 的示例应用程序：

讯享网

1. 创建一个 Spring Boot 应用程序，并添加依赖：

&lt;dependency&gt; &lt;groupId&gt;org.<em>spring</em>framework.<em>boot</em>&lt;/groupId&gt; &lt;artifactId&gt;<em>spring</em>-<em>boot</em>-starter-web&lt;/artifactId&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;org.apache.<em>shiro</em>&lt;/groupId&gt; &lt;artifactId&gt;<em>shiro</em>-<em>spring</em>-<em>boot</em>-web-starter&lt;/artifactId&gt; &lt;version&gt;1.5.3&lt;/version&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;org.jasig.cas.client&lt;/groupId&gt; &lt;artifactId&gt;cas-client-core&lt;/artifactId&gt; &lt;version&gt;3.6.0&lt;/version&gt; &lt;/dependency&gt; 

1. 配置 Shiro：

讯享网@Configuration public class <em>Shiro</em>Config { @Bean public CasRealm casRealm() { CasRealm realm = new CasRealm(); realm.setCasServerUrlPrefix(&quot;https://cas.example.com/cas&quot;); realm.setCasService(&quot;https://myapp.example.com/cas&quot;); realm.setDefaultRoles(&quot;user&quot;); realm.setRoleAttributeNames(&quot;memberOf&quot;); return realm; } @Bean public DefaultWebSecurityManager securityManager() { DefaultWebSecurityManager manager = new DefaultWebSecurityManager(); manager.setRealm(casRealm()); return manager; } @Bean public <em>Shiro</em>FilterFactoryBean <em>shiro</em>Filter() { <em>Shiro</em>FilterFactoryBean filter = new <em>Shiro</em>FilterFactoryBean(); filter.setSecurityManager(securityManager()); filter.setLoginUrl(&quot;https://cas.example.com/cas/login?service=https://myapp.example.com/cas&quot;); filter.setSuccessUrl(&quot;/home&quot;); filter.setUnauthorizedUrl(&quot;/403&quot;); filter.setFilterChainDefinitionMap(Collections.singletonMap(&quot;/&quot;, &quot;authc&quot;)); return filter; } } 

1. 配置 CAS：

@Configuration public class CasConfig { @Bean public CasAuthenticationFilter casAuthenticationFilter() { CasAuthenticationFilter filter = new CasAuthenticationFilter(); filter.setCasServerLoginUrl("https://cas.example.com/cas/login"); filter.setServerName("https://myapp.example.com/cas"); filter.setAuthenticationSuccessHandler(authenticationSuccessHandler()); filter.setAuthenticationFailureHandler(authenticationFailureHandler()); return filter; } @Bean public SimpleUrlAuthenticationSuccessHandler authenticationSuccessHandler() { SimpleUrlAuthenticationSuccessHandler handler = new SimpleUrlAuthenticationSuccessHandler(); handler.setDefaultTargetUrl("/home"); handler.setAlwaysUseDefaultTargetUrl(true); return handler; } @Bean public SimpleUrlAuthenticationFailureHandler authenticationFailureHandler() { SimpleUrlAuthenticationFailureHandler handler = new SimpleUrlAuthenticationFailureHandler(); handler.setDefaultFailureUrl("/login?error=true"); return handler; } @Bean public FilterRegistrationBean<CasAuthenticationFilter> casFilterRegistrationBean() { FilterRegistrationBean<CasAuthenticationFilter> registration = new FilterRegistrationBean<>(); registration.setFilter(casAuthenticationFilter()); registration.addUrlPatterns("/*"); registration.setName("CAS Authentication Filter"); registration.setOrder(1); return registration; } @Bean public ServletListenerRegistrationBean<SingleSignOutHttpSessionListener> singleSignOutHttpSessionListener() { ServletListenerRegistrationBean<SingleSignOutHttpSessionListener> registration = new ServletListenerRegistrationBean<>(); registration.setListener(new SingleSignOutHttpSessionListener()); registration.setOrder(2); return registration; } @Bean public ServletRegistrationBean<Servlet> casValidationServletRegistrationBean() { ServletRegistrationBean<Servlet> registration = new ServletRegistrationBean<>(); registration.setServlet(new Cas20ProxyReceivingTicketValidationFilter()); registration.addUrlMappings("/cas/*"); registration.setName("CAS Validation Filter"); registration.setOrder(3); return registration; } } 

1. 创建一个 HomeController：

讯享网@Controller public class HomeController { @GetMapping("/home") public String home() { return "home"; } @GetMapping("/403") public String error403() { return "403"; } } 

1. 创建一个 CAS 认证服务器：

@<em>SpringBoot</em>Application public class CasServerApplication { public static void main(String[] args) { <em>Spring</em>Application.run(CasServerApplication.class, args); } } 

1. 创建一个 CAS 客户端：

讯享网@<em>SpringBoot</em>Application @EnableScheduling public class CasClientApplication { public static void main(String[] args) { <em>Spring</em>Application.run(CasClientApplication.class, args); } } 

这就是一个简单的 Spring Boot + Shiro + CAS 的示例应用程序。