<>();
        if (authenticationToken instanceof SSOToken) {
            // 单点登录方式选择SSORealm
            for (Realm realm : realms) {
                if (realm.getName().contains(LoginType.SSO.toString())) {
                    typeRealms.add(realm);
                }
            }
        } else if (authenticationToken instanceof UsernamePasswordToken) {
            //用户名密码方式登录,选择UserRealm
            for (Realm realm : realms) {
                if (realm.getName().contains(LoginType.USERNAME.toString())) {
                    typeRealms.add(realm);
                }
            }
        }
        if (typeRealms.size() == 1) {
            return doSingleRealmAuthentication(typeRealms.iterator().next(), authenticationToken);
        }
        return doMultiRealmAuthentication(typeRealms, authenticationToken);
    }
}
      
 
       
 
      四、编写配置文件
完成上述工作后,多realm配置基本完成了,不过由于用到了BearToken,还需要对shiro的配置类进行一些改造
@Configuration
public class ShiroConfig {
    @Autowired
    private ModularRealmAuthenticator customModularRealmAuthenticator;
    /**
     * 自定义Realm
     */
    @Bean
    public UserRealm userRealm() {
        UserRealm userRealm = new UserRealm();
        return userRealm;
    }
    @Bean
    public SSORealm ssoRealm() {
        SSORealm userRealm = new SSORealm();
        userRealm.setAuthenticationTokenClass(BearerToken.class);
        return userRealm;
    }
    /**
     * 安全管理器
     */
    @Bean
    public DefaultWebSecurityManager securityManager(Collection realms) {
        DefaultWebSecurityManager securityManager = new DefaultWebSecurityManager();
        //设置多realm识别
        securityManager.setAuthenticator(customModularRealmAuthenticator);
        // 设置realm.
        securityManager.setRealms(realms);
        return securityManager;
    }
    @Bean
    public ShiroFilterFactoryBean shiroFilterFactoryBean(SecurityManager securityManager) {
        ShiroFilterFactoryBean shiroFilterFactoryBean = new ShiroFilterFactoryBean();
        // Shiro的核心安全接口,这个属性是必须的
        shiroFilterFactoryBean.setSecurityManager(securityManager);
        // 身份认证失败,则跳转到登录页面的配置
        shiroFilterFactoryBean.setLoginUrl("/login");
        // 权限认证失败,则跳转到指定页面
        shiroFilterFactoryBean.setUnauthorizedUrl("/unauth");
        // Shiro连接约束配置,即过滤链的定义
        LinkedHashMap filterChainDefinitionMap = new LinkedHashMap<>();
        filterChainDefinitionMap.put("/logout", "logout");
        filterChainDefinitionMap.put("/normal", "anon");
        filterChainDefinitionMap.put("/sso", "anon");
        filterChainDefinitionMap.put("/**", "authc");
        Map filters = new LinkedHashMap();
        shiroFilterFactoryBean.setFilters(filters);
        shiroFilterFactoryBean.setFilterChainDefinitionMap(filterChainDefinitionMap);
        return shiroFilterFactoryBean;
    }
}    五、总结
至此,单点登录的多realm实现基本完成了,由于项目原因,贴出的代码基本都是示例,读者可以按需进行修改,需要新增的就是realm、自定义身份验证器,还有就是需要对shiro config进行一些调整,全部的代码示例已经上传到github,如有需要可以自行下载。
