注意点:
org.apache.ibatis.binding.BindingException: Type interface com.jy.dao.UserDao is not known to the MapperRegistry.
org.apache.ibatis.binding。类型接口com. js .dao。MapperRegistry不知道UserDao。
这个是没注册mapper
原文：https://www.cnblogs.com/ljy9/p/14193346.html
