MapStruct使用(一)

• 官网

• 不同的convert解决方案

• 自己编写conver，需写大量的代码

    /**
     * 测试传统的通过getter和setter赋值完成pojo之间转换
     * CarDto-->CarVo
     */
    @Test
    public void test1() {
        // 模拟业务构造出的CarDTO对象
       CarDTO carDTO = buildCarDTO();
       // 转化dto-vo
        CarVO carVO = new CarVO();
        carVO.setId(carDTO.getId());
        carVO.setVin(carDTO.getVin());
        carVO.setPrice(carDTO.getPrice()); // 装箱拆箱机制，不需要我们自己转化
        double totalPrice = carDTO.getTotalPrice();
        DecimalFormat df = new DecimalFormat("#.00");
        String totalPriceStr = df.format(totalPrice);
        carVO.setTotalPrice(totalPriceStr);
        Date publishDate = carDTO.getPublishDate();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        String publishDateFormat = sdf.format(publishDate);
        carVO.setPublishDate(publishDateFormat);
        carVO.setBrandName(carDTO.getBrand());
        List<PartDTO> partDTOS = carDTO.getPartDTOS();
        boolean hasPart = partDTOS != null && !partDTOS.isEmpty();
        carVO.setHasPart(hasPart);
        DriverVO driverVO = new DriverVO();
        DriverDTO driverDTO = carDTO.getDriverDTO();
        driverVO.setDriverId(driverDTO.getId());
        driverVO.setFullName(driverDTO.getName());
        carVO.setDriverVO(driverVO);
        System.out.println(carVO);
    }

    /**
     * 模拟业务构造出的CarDTO对象
     */
    private CarDTO buildCarDTO() {
        CarDTO carDTO = new CarDTO();
        carDTO.setId(330L);
        carDTO.setVin("vin123456789");
        carDTO.setPrice(123789.126d);
        carDTO.setTotalPrice(143789.126d);
        carDTO.setPublishDate(new Date());
        carDTO.setColor("白色");
        carDTO.setBrand("大众");
        // 零件
        PartDTO partDTO1 = new PartDTO();
        partDTO1.setPartId(1L);
        partDTO1.setPartName("多功能方向盘");
        PartDTO partDTO2 = new PartDTO();
        partDTO2.setPartId(2L);
        partDTO2.setPartName("智能车门");
        List<PartDTO> partDTOList = new ArrayList<>();
        partDTOList.add(partDTO1);
        partDTOList.add(partDTO2);
        carDTO.setPartDTOS(partDTOList);
        // 设置驾驶员
        DriverDTO driverDTO = new DriverDTO();
        driverDTO.setId(88L);
        driverDTO.setName("小明");
        carDTO.setDriverDTO(driverDTO);
        return carDTO;
    }

• 使用MapStruct转换

# 引入依赖
    <dependency>
      <groupId>org.mapstruct</groupId>
      <artifactId>mapstruct</artifactId>
      <version>${mapstruct.version}</version>
    </dependency>
    <dependency>
      <groupId>org.mapstruct</groupId>
      <artifactId>mapstruct-processor</artifactId>
      <version>${mapstruct.version}</version>
    </dependency>

# 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
    @Test
    public void test2() {
        CarDTO carDTO = buildCarDTO();
        CarVO carVO = CarConvert.INSTANCE.dto2vo(carDTO);
        System.out.println(carVO);
    }