Consider defining a bean of type xxxxMapper in your configuration

mapper需要加注解,
1.在启动类加上注解

@MapperScan(value = "com.demo.mapper" )

2.若不是原生配置,可以在启动类上加上@MapperScan注解,但并不是最正确的.最理想的是在MyBatis的配置文件上加

原文解决方案: https://wwwblogs/JealousGirl/p/bean.html