main函数不包含业务逻辑，仅仅调用初始化数据库，调用配置文件，启动框架的操作
config包下是appication.yml文件，主要存放各类工具的配置，如mysql，redis，server port等等
common包是基础包配置，如数据库初始化函数，jwt获取函数等等的存放
cotroller 是各类handler函数的实现，在这里实现crud等操作
存放后端数据库实体类
封装返回前端的数据，也就是与model对应的，返回前端的结构体（实体类）
存放中间件，也就是路由调用handle之前处理的事情 AuthMiddleWare 是token验证中间件
封装统一的返回函数，Response（）和两个常见的 Success 和 Fail
封装工具类
路由包，存放路由组等
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