解决Springboot报错：Field xx in xx required a bean of type 'xx' that could not be found.

技术栈：Springboot+mybatis

完整报错提示：

Description:

Field usualService in com.sxdt.order.food.usualParts.controller.UsualController required a bean of type 'com.sxdt.order.food.usualParts.service.UsualService' that could not be found.

The injection point has the following annotations:
	- @org.springframework.beans.factory.annotation.Autowired(required=true)


Action:

Consider defining a bean of type 'com.sxdt.order.food.usualParts.service.UsualService' in your configuration.

解决方法：添加注解

如果是DAO的问题，就在dao类前添加  @Mapper

效果如下：