这样写就可解决

  <properties><java.version>1.8</java.version><mapstruct.version>1.4.1.Final</mapstruct.version></properties><dependency><groupId>org.mapstruct</groupId><artifactId>mapstruct</artifactId><version>${mapstruct.version}</version></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><optional>true</optional></dependency>

 <build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-compiler-plugin</artifactId><version>3.8.1</version><configuration><source>8</source><target>8</target><encoding>UTF-8</encoding><annotationProcessorPaths><!-- 必须要加, 否则生成不了 MapperImpl 实现类 --><path><groupId>org.mapstruct</groupId><artifactId>mapstruct-processor</artifactId><version>${mapstruct.version}</version></path><path><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><version>1.18.20</version></path><!-- 如果是 0.1.0 有可能出现生成了maptruct的实现类, 但该类只创建了对象, 没有进行赋值 --><path><groupId>org.projectlombok</groupId><artifactId>lombok-mapstruct-binding</artifactId><version>0.2.0</version></path></annotationProcessorPaths></configuration></plugin></plugins></build>