今天无意发现了一个符合 OIDC 的 JAVA 客户端（pac4j），无缝支持 IdentityServer 与 Keycloak 。支持 OpenID Connect providers: Google, AzureAD, Okta, IdentityServer3 (and 4), MitreID, Keycloak 4.6 ，使用详细具体看文档吧 。
REFER:
https://openid.net/certification/#OPs
https://github.com/pac4j/pac4j
https://www.pac4j.org/docs/alldocs.htmlhttps://connect2id.com/products/nimbus-oauth-openid-connect-sdk (Nimbus)
https://github.com/spring-projects-experimental/spring-authorization-server
https://spring.io/blog/2020/04/15/announcing-the-spring-authorization-server
https://github.com/spring-projects/spring-security/wiki/OAuth-2.0-Migration-Guide
https://github.com/spring-projects/spring-security/wiki/OAuth-2.0-Features-Matrix
https://connect2id.com/products/nimbus-oauth-openid-connect-sdk/openid-connect-providers
http://docs.identityserver.io/en/release/intro/specs.html