支持多種協議的身份認證Java客戶端：pac4j

pac4j是一個支持多種支持多種協議的身份認證的Java客戶端。

它有一個非常簡單和統一的API以支持以下這6個客戶端認證機制：

1. OAuth (1.0 & 2.0)
2. CAS (1.0, 2.0, SAML, logout & proxy)
3. HTTP (form & basic auth authentications)
4. OpenID
5. SAML (2.0)
6. Google App Engine UserService.
7. OpenID Connect 1.0

提供 7 種庫實現用于不同環境：

1. the CAS server (using the cas-server-support-pac4j library)
2. the Play 2.x framework (using the play-pac4j_java and play-pac4j_scala libraries)
3. any basic J2E environment (using the j2e-pac4j library)
4. the Apache Shiro library (using the buji-pac4j library)
5. the Spring Security library (using the spring-security-pac4j library)
6. the Ratpack JVM toolkit (using the ratpack-pac4j module)
7. the Vertx framework (using the vertx-pac4j module).

項目主頁：http://www.baiduhome.net/lib/view/home/1418870307933