CAS Client Spring Security vs. Shiro vs. Pac4j

CAS - CAS Clients
https://apereo.github.io/cas/5.2.x/integration/CAS-Clients.html

CAS - CAS Clients
https://apereo.github.io/cas/4.2.x/integration/CAS-Clients.html

apereo/java-cas-client: Apereo Java CAS Client
https://github.com/apereo/java-cas-client

Spring Security
https://spring.io/projects/spring-security

Springboot security cas整合方案-原理篇 - 南柯问天 - 博客园
https://www.cnblogs.com/question-sky/p/7061522.html

使用Spring Security 集成 CAS 完成单点登录 - 简书
https://www.jianshu.com/p/2ba25bd3a5cb

Spring Security实践（三）：通过CAS实现SSO - 简书
https://www.jianshu.com/p/daca18a8f84c

Apache Shiro | Simple. Java. Security.
http://shiro.apache.org/cas.html

pac4j/pac4j: Security engine for Java (authentication, authorization, multi frameworks): OAuth, CAS, SAML, OpenID Connect, LDAP, JWT...
https://github.com/pac4j/pac4j

`pac4j` is an easy and powerful security engine for Java to authenticate users, get their profiles and manage authorizations in order to secure web applications and web services.

It provides a comprehensive set of concepts and components. It is based on Java 8 and available under the Apache 2 license. It is available for most frameworks/tools and supports most authentication/authorization mechanisms.