CAS is an authentication system originally created by Yale University to provide a trusted way for an application to authenticate a user.
CAS is an enterprise Single Sign-On solution for web services. Single Sign-On (SSO) means a better user experience when running a multitude of web services, each with its own means of authentication. With a SSO solution, different web services may authenticate to one authorative source of trust, that the user needs to log in to, instead of requiring the end-user to log in into each separate service.
1. CAS1
The Central Authentication Server (CAS) is designed as a standalone web application. It is currently implemented as several Java servlets and runs through the HTTPS server on secure.its.yale.edu. It is accessed through three URLs described below: the login URL, the validation URL, and the optional logout URL.

2. CAS2
实现:
1)CAS Web APP 使用 SSL
2)对于各个APP, 需要修改 web.xml 文件来配置 servlet 过滤器
本文介绍了由耶鲁大学创建的CAS(Central Authentication Service),这是一种为Web服务提供单点登录(SSO)解决方案的企业级认证系统。通过CAS,多个Web服务可以信任单一的权威认证源,从而简化了用户的登录体验。
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