本篇内容主要讲解“MapStruct如何使用”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“MapStruct如何使用”吧!
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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 dtos2vos(List carDTO);
}
# 测试
/**
* 测试mapstruct批量转换
* List--> List
*/
@Test
public void test3() {
CarDTO carDTO = buildCarDTO();
List carDTOList = new ArrayList<>();
carDTOList.add(carDTO); // source
// target
List 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
# 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);
}
}到此，相信大家对“MapStruct如何使用”有了更深的了解，不妨来实际操作一番吧！这里是创新互联网站，更多相关内容可以进入相关频道进行查询，关注我们，继续学习！
