MapStruct使用(二)

• 批量轉換

# 編寫convert
import org.mapstruct.factory.Mappers;
import java.util.List;
@Mapper
public abstract class CarConvert {

    public static CarConvert INSTANCE = Mappers.getMapper(CarConvert.class);

    public abstract List<CarVO> dtos2vos(List<CarDTO> carDTO);

}

# 測試
    /**
     * 測試mapstruct批量轉換
     * List<CarDto>--> List<CarVo>
     */
    @Test
    public void test3() {
        CarDTO carDTO = buildCarDTO();
        List<CarDTO> carDTOList = new ArrayList<>();
        carDTOList.add(carDTO); // source
        // target
        List<CarVO> carVOList = CarConvert.INSTANCE.dtos2vos(carDTOList);
        System.out.println(carVOList);
    }      

• @BeanMapping
• 如果有多個屬性需要忽略的時候，需要些很多行

# 編寫convert
import org.mapstruct.factory.Mappers;
import java.util.List;
@Mapper
public abstract class CarConvert {

    public static CarConvert INSTANCE = Mappers.getMapper(CarConvert.class);

    /**
     * 配置忽略mapstruct的預設映射行為，隻映射那些配置了@Mapping的屬性
     * @param carDTO
     */
    @BeanMapping(ignoreByDefault = true)
    @Mapping(source = "id",target = "id")
    public abstract VehicleVO carDTO2vehicleVO(CarDTO carDTO);
}

# 測試
    @Test
    public void test4() {
        CarDTO carDTO = buildCarDTO();
        VehicleVO vehicleVO = CarConvert.INSTANCE.carDTO2vehicleVO(carDTO);
        System.out.println(vehicleVO);
    }      

• 映射繼承

# 編寫convert
import org.mapstruct.factory.Mappers;
import java.util.List;
@Mapper
public abstract class CarConvert {

    public static CarConvert INSTANCE = Mappers.getMapper(CarConvert.class);

    /**
     * 配置忽略mapstruct的預設映射行為，隻映射那些配置了@Mapping的屬性
     * @param carDTO
     */
    @BeanMapping(ignoreByDefault = true)
    @Mapping(source = "id",target = "id")
    @Mapping(source = "brand",target = "brandName")
    public abstract VehicleVO carDTO2vehicleVO(CarDTO carDTO);

    /**
     * 會繼承全部配置，包括@BeanMapping和@Mapping
     * @param carDTO
     * @param vehicleVO
     */
    @InheritConfiguration(name = "carDTO2vehicleVO")
    public abstract void updateVehicleVO(CarDTO carDTO,@MappingTarget VehicleVO vehicleVO);
}

# 測試
    @Test
    public void test5() {
        CarDTO carDTO = buildCarDTO();
        VehicleVO vehicleVO = CarConvert.INSTANCE.carDTO2vehicleVO(carDTO);

        CarDTO carDTO2 = new CarDTO();
        carDTO2.setId(330L);
        carDTO2.setPrice(789d);
        carDTO2.setBrand("邁巴赫");
        // 通過carDTO2的屬性值來更新已存在的vehicleVO對象
        CarConvert.INSTANCE.updateVehicleVO(carDTO2,vehicleVO);
        System.out.println(vehicleVO);
    }      

• 反向繼承

# 編寫convert
import org.mapstruct.factory.Mappers;
import java.util.List;
@Mapper
public abstract class CarConvert {

    public static CarConvert INSTANCE = Mappers.getMapper(CarConvert.class);

    /**
     * 配置忽略mapstruct的預設映射行為，隻映射那些配置了@Mapping的屬性
     * @param carDTO
     */
    @BeanMapping(ignoreByDefault = true)
    @Mapping(source = "id",target = "id")
    @Mapping(source = "brand",target = "brandName")
    public abstract VehicleVO carDTO2vehicleVO(CarDTO carDTO);

    /**
     * 測試@InheritInverseConfiguration反向繼承，隻會繼承@Mapping
     * 故需要再單獨寫一次 @BeanMapping
     * name:指定使用哪一個方法的配置,寫方法的名字
     * @param vehicleVO
     */
    @BeanMapping(ignoreByDefault = true)
    @InheritInverseConfiguration(name = "carDTO2vehicleVO")
    public abstract CarDTO vehicleVO2CarDTO(VehicleVO vehicleVO);
}

# 測試
    @Test
    public void test6() {
       VehicleVO vehicleVO = new VehicleVO();
       vehicleVO.setId(9999L);
       vehicleVO.setBrandName("别克");
       vehicleVO.setPrice(66554322d);
        CarDTO carDTO = CarConvert.INSTANCE.vehicleVO2CarDTO(vehicleVO);
        System.out.println(carDTO);
    }      

• 結合spring使用

# 編寫convert
import org.mapstruct.factory.Mappers;
import java.util.List;
@Mapper(componentModel = "spring")                                                              <-----
public abstract class CarConvert {

    public static CarConvert INSTANCE = Mappers.getMapper(CarConvert.class);

    /**
     * 配置忽略mapstruct的預設映射行為，隻映射那些配置了@Mapping的屬性
     * @param carDTO
     */
    @BeanMapping(ignoreByDefault = true)
    @Mapping(source = "id",target = "id")
    @Mapping(source = "brand",target = "brandName")
    public abstract VehicleVO carDTO2vehicleVO(CarDTO carDTO);

    /**
     * 測試@InheritInverseConfiguration反向繼承，隻會繼承@Mapping
     * 故需要再單獨寫一次 @BeanMapping
     * name:指定使用哪一個方法的配置,寫方法的名字
     * @param vehicleVO
     */
    @BeanMapping(ignoreByDefault = true)
    @InheritInverseConfiguration(name = "carDTO2vehicleVO")
    public abstract CarDTO vehicleVO2CarDTO(VehicleVO vehicleVO);
}

# 測試
@RunWith(SpringRunner.class)
@SpringBootTest(classes = MapStructApplication.class)
public class MapStructTest {

//    @Autowired
    @Resource
    private CarConvert carConvert;

    /**
     * 測試mapstruct和spring整合
     */
    @Test
    public void test7() {
        VehicleVO vehicleVO = new VehicleVO();
        vehicleVO.setId(9999L);
        vehicleVO.setBrandName("别克");
        vehicleVO.setPrice(66554322d);
        CarDTO carDTO = carConvert.vehicleVO2CarDTO(vehicleVO);
        System.out.println(carDTO);
    }

}