解决Consider defining a bean of type ‘*Mapper‘ in your configuration.

pom.xml
<dependency>
     <groupId>org.mybatis.spring.boot</groupId>
     <artifactId>mybatis-spring-boot-starter</artifactId>
     <version>2.0.1</version>
 </dependency>
 1.在Mapper接口上贴@Mapper@Repository
 @Mapper
 public interface CommodityMapper {
     /**
      * 查询所有商品信息
      * @return List<Commodity> 所有商品信息
      */
     List<Commodity> selectAll();
 }
 2.启动类上贴@MapperScan(value = "com.xiami.springboot.sbootdemo.mapper")注解,告诉Spring,Mapper接口的位置@SpringBootApplication
 @MapperScan(value = "com.xiami.springboot.sbootdemo.mapper")
 public class SbootdemoApplication {
  
     public static void main(String[] args) {
         SpringApplication.run(SbootdemoApplication.class, args);
     }
  
 }