数据实体转换MapStruct常用点

<dependency>
   <groupId>org.mapstruct</groupId>
   <artifactId>mapstruct-jdk8</artifactId>
   <version>1.2.0.Final</version>
</dependency>

<dependency>
   <groupId>org.mapstruct</groupId>
   <artifactId>mapstruct-processor</artifactId>
   <version>1.2.0.Final</version>
</dependency>

@Data
@Builder
@NoArgsConstructor
@AllArgsConstructor

public class School {
    private String schoolName; 
    private Student st;
} 

@Data
@Builder
@NoArgsConstructor
@AllArgsConstructor
  public class Student {
    private String name; 
    private int age;
  }

@Data
@Builder
@NoArgsConstructor
@AllArgsConstructor
  public class SchoolDO {
    private String schoolName;
    private StudentDO stNew;
  }

@Data
@Builder
@NoArgsConstructor
@AllArgsConstructor
  public class StudentDO {
    private String name;
    private int newAge;
  }

public interface BasicMapper<SOURCE, TARGET> {
    /**
     * @Mappings({
     * @Mapping(source = "code", target = "newCode"),
     * @Mapping(source = "name", target = "newName")
     * })
     */
    @Mappings({})
    @InheritConfiguration
    TARGET to(SOURCE source);  

    @InheritConfiguration
    List<TARGET> to(Collection<SOURCE> source);  

    @InheritInverseConfiguration
    SOURCE from(TARGET source);  

    @InheritInverseConfiguration
    List<SOURCE> from(Collection<TARGET> source);
  }

@Component
@Mapper(componentModel = "spring", unmappedTargetPolicy = ReportingPolicy.IGNORE)
public interface StudentConvert extends BasicMapper<Student, StudentDO>{
     @Mappings({
     @Mapping(source = "age", target = "newAge")
     })
     StudentDO to(Student source);
  } 

public static void main(String[] args) {
    SpringApplication.run(StructTest.class, args);
    ApplicationContext context = SpringUtil.getApplicationContext();
    StudentConvert stConvert = context.getBean(StudentConvert.class);
    /**
 * 实际转换中直接可单条或是多条list记录，并且有属性名不一致也可以
 * mapper接口中指定
 */

    Student st = Student.builder().name("student").age(18).build();
    Student st2 = Student.builder().name("student2").age(180).build();
    List<Student> stList = Lists.newArrayList(st, st2); 
    List<StudentDO> stDos = stConvert.to(stList);
    System.out.println(stDos.toString());

}

@Component
@Mapper(componentModel = "spring", unmappedTargetPolicy = ReportingPolicy.IGNORE, uses = {StudentConvert.class})
public interface SchoolConvert {
     @Mappings({
         @Mapping(source = "st", target = "stNew")
     })
     SchoolDO to(School source);
  }

@SpringBootApplication
  public class StructTest { 

    public static void main(String[] args) {
        SpringApplication.run(StructTest.class, args);
        ApplicationContext context = SpringUtil.getApplicationContext();     

        //demo 2
        SchoolConvert schoolConvert = context.getBean(SchoolConvert.class);
        School school = School.builder().schoolName("school-1").st(st).build();
        SchoolDO schDO = schoolConvert.to(school);
        System.out.println(schDO);
    }
}

@Mappings(
        @Mapping(source = "orderItem.discountInfo", target = "discountInfo")
)
  ItemDetailDto order2itemdetail(OrderBaseDto orderBaseDto);

 @Mappings({
        @Mapping(target = "materialId",source = "giftDetail.materialId")})
DemoDto command2ToDto(DemoCommand demoCommand);

@Mapper(componentModel = "spring", unmappedTargetPolicy = ReportingPolicy.IGNORE,
imports = {TypeEnum.class})
public interface CampaignInputConvert {
       @Mappings({          
            @Mapping(target ="giftType",expression = "java(TypeEnum.ITEM_NO.code()"),                      
            @Mapping(target = "media",expression = "java(CommonConsts.SEND_MEDIA)")          
    })
    GiftDemoBaseDto goodsDetailToGiftRpc(GoodsDemoOutput goodsDemoOutput, CustDemoOutput custDemoOutput, CustDemoDO custDemoDO);
  

@Component
@Mapper(componentModel = "spring", unmappedTargetPolicy = ReportingPolicy.IGNORE)
public interface DemoInfoConvert {

    List<DemoInfo> discntInfoDtoList2DemoInfoList(List<DemoInfoDto> demoInfoDtos);
    @Mappings({
       @Mapping(target = "discountValue", expression = "java(getDemotValue(discntInfoDto))")
    })
    CouponInfo dto2output(DiscntInfoDto discntInfoDto);

    default Long getDemoValue(DemoInfoDto demoInfoDto) {
        if (discntInfoDto.getDiscountValue() != null) {
            return discntInfoDto.getDiscountValue();
        } else {
            return discntInfoDto.getReduceValue();
        }
    }
}