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MapStruct使用(二)

灯火南山 2022-10-08 阅读 153
  • 批量转换

# 编写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);

}

# 测试
/**
* 测试mapstruct批量转换
* 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
  • 如果有多个属性需要忽略的时候,需要些很多行
  • MapStruct使用(二)_spring

# 编写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的默认映射行为,只映射那些配置了@Mapping的属性
* @param carDTO
*/
@BeanMapping(ignoreByDefault = true)
@Mapping(source = "id",target = "id")
public abstract VehicleVO carDTO2vehicleVO(CarDTO carDTO);
}

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

  • 映射继承

# 编写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的默认映射行为,只映射那些配置了@Mapping的属性
* @param carDTO
*/
@BeanMapping(ignoreByDefault = true)
@Mapping(source = "id",target = "id")
@Mapping(source = "brand",target = "brandName")
public abstract VehicleVO carDTO2vehicleVO(CarDTO carDTO);

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

# 测试
@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("迈巴赫");
// 通过carDTO2的属性值来更新已存在的vehicleVO对象
CarConvert.INSTANCE.updateVehicleVO(carDTO2,vehicleVO);
System.out.println(vehicleVO);
}

  • 反向继承

# 编写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的默认映射行为,只映射那些配置了@Mapping的属性
* @param carDTO
*/
@BeanMapping(ignoreByDefault = true)
@Mapping(source = "id",target = "id")
@Mapping(source = "brand",target = "brandName")
public abstract VehicleVO carDTO2vehicleVO(CarDTO carDTO);

/**
* 测试@InheritInverseConfiguration反向继承,只会继承@Mapping
* 故需要再单独写一次 @BeanMapping
* name:指定使用哪一个方法的配置,写方法的名字
* @param vehicleVO
*/
@BeanMapping(ignoreByDefault = true)
@InheritInverseConfiguration(name = "carDTO2vehicleVO")
public abstract CarDTO vehicleVO2CarDTO(VehicleVO vehicleVO);
}

# 测试
@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);
}

  • 结合spring使用

# 编写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的默认映射行为,只映射那些配置了@Mapping的属性
* @param carDTO
*/
@BeanMapping(ignoreByDefault = true)
@Mapping(source = "id",target = "id")
@Mapping(source = "brand",target = "brandName")
public abstract VehicleVO carDTO2vehicleVO(CarDTO carDTO);

/**
* 测试@InheritInverseConfiguration反向继承,只会继承@Mapping
* 故需要再单独写一次 @BeanMapping
* name:指定使用哪一个方法的配置,写方法的名字
* @param vehicleVO
*/
@BeanMapping(ignoreByDefault = true)
@InheritInverseConfiguration(name = "carDTO2vehicleVO")
public abstract CarDTO vehicleVO2CarDTO(VehicleVO vehicleVO);
}

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

// @Autowired
@Resource
private CarConvert carConvert;

/**
* 测试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);
}

}



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