学习领域服务设计，主要是根据https://gitee.com/only4playgroup/op-system-center仓库代码进行学习设计
OP-IDP 是一个基于 Spring Authorization Server 自研的 OAuth2/OIDC 身份认证平台，提供统一登录、单点登录（SSO）、统一登出（SLO）、多因素认证（MFA）与管理后台，定位私有化单租户交付，开箱即用。
利用freemarker模板导出复杂excel
亿级用户中心的设计与实践
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