问题：
Description:
Field xxxMapper in xxxxxxx required a bean of type 'xxxxMapper'that could not be found.
The injection point has the following annotations:
-@org.springframework.beans.factory.annotation.Autowired(required=true)
解决方法：
在Spring Boot启动类Application上添加注解@MapperScan，指定要扫描的Mapper类的包的路径，如：
@MapperScan("com.example.mapper")