Question

问题在于，用@AfterMapping注释的方法根本没有被调用。从testToEntityMapping进入toEntity方法，但是它没有调用任何toEntityAfterMapping()方法。为什么呢可能吗？如何使用MapStruct实现呢？

（这里我准备了一个毫无意义的场景，但它完全抓住了我的问题的本质）
实体：

public class Ford {
    private String color;
    private String market;
    private int totalWidth;

    //getters and setters omitted for brevity
}

Dtos：

public abstract class FordDto {
    public String market;
    public String color;

    //getters and setters omitted for brevity
}

public class EuropeanFordDto extends FordDto{
    private int totalWidth;

    public int getTotalWidth() {
        return totalWidth + 2;//"+2" for EU market
    }
    //setter omitted for brevity
}

public class AmericanFordDto extends FordDto{
    private int totalWidth;

    public int getTotalWidth() {
        return totalWidth + 1;//"+1" for US market
    }

    //setter omitted for brevity
}

映射器：

public abstract class FordMapper<D extends FordDto> {
    public Ford toEntity(D dto) {

        /* fill in fields common to both ford versions */

        final Ford ford = new Ford();

        ford.setColor(dto.getColor());
        ford.setMarket(dto.getMarket());

        return ford;
    }
}
@Mapper(componentModel = "spring")
public abstract class EuropeanFordMapper extends FordMapper<EuropeanFordDto> {

    @AfterMapping
    public void toEntityAfterMapping(final EuropeanFordDto dto, @MappingTarget final Ford entity) {

        /* Fill in fields related to european version of the ford */

        entity.setTotalWidth(dto.getTotalWidth());
    }
}
@Mapper(componentModel = "spring")
public abstract class AmericanFordMapper extends FordMapper<AmericanFordDto> {

    @AfterMapping
    public void toEntityAfterMapping(final AmericanFordDto dto, @MappingTarget final Ford entity) {

        /* Fill in fields related to american version of the ford */

        entity.setTotalWidth(dto.getTotalWidth());
    }
}

服务：

@Service
public class CarService {

    @Autowired
    private AmericanFordMapper americanFordMapper;
    @Autowired
    private EuropeanFordMapper europeanFordMapper;

    public void testToEntityMapping(final FordDto dto) {

        if (dto instanceof AmericanFordDto) {
            americanFordMapper.toEntity((AmericanFordDto) dto);
        } else {
            europeanFordMapper.toEntity((EuropeanFordDto) dto);
        }
    }
}

Answer 1

好吧，我认为这很简单。

public interface FordMapper<D extends FordDto> {

    @Mapping(target = "totalWidth", ignore=true)
    public abstract Ford toEntity(D dto);
}

您甚至可以窥见toEntity()方法中的实现，其中调用了toEntityAfterMapping()，因此一切都是正确的，并且符合我们的期望结果。

Answer 2

我对同一个问题的解决方案是我忘记在'@AfterMapping方法中添加'default'关键字（我使用了接口）。之后，在生成的代码中出现了方法。

如果您是Mapstruct的新手，请不要忘记在进行更改后进行mvn / gradle清理和编译。

Mapstruct“后映射”未称为

2 个答案: