如何将 spring bean 注入（custructor）到 Mapstruct 的抽象映射器中？

Question

我有下面的映射器类，我想在其中使用CounterService. 我正在尝试构造函数注入，但这不起作用并且null正在打印。

@Mapper(componentModel = "spring", uses = CounterService.class, injectionStrategy = InjectionStrategy.CONSTRUCTOR)
public abstract class CarMapper {

    private CounterService counterService;

    public CarMapper(CounterService counterService) {
       this.counterService = counterService;
    }

    public abstract Car dtoToEntity(CarDto carDto);

    public CarDto entityToDto(Car car) {
        System.out.println(counterService)
        //....
        return carDto;
    }

}

实现类由mapStruct

@Component
public class CarMapperImpl extends CarMapper{

  @Override
  public Car dtoToEntity(CarDto carDto){
    //...
  }
}

如果我使用字段注入@AutoWired，那么它就可以正常工作。这意味着Spring不支持abstract类的构造函数注入。是不是因为abstract类不能直接实例化，需要子类来实例化？
有什么方法mapStruct可以在实现类中创建构造函数，如下所示：

  public CarMapperImpl(CounterService counterService){
    super(counterService);
  }

这样，构造函数注入应该可以工作。

Answer 1

这与春天无关。不使用超级构造函数是 MapStruct 团队经过深思熟虑的决定。

但你可以做的是使用 setter 注入。

@Mapper(componentModel = "spring", uses = CounterService.class, injectionStrategy = InjectionStrategy.CONSTRUCTOR)
public abstract class CarMapper {

    private CounterService counterService;

    public abstract Car dtoToEntity(CarDto carDto);

    public CarDto entityToDto(Car car) {
        System.out.println(counterService)
        //....
        return carDto;
    }

    @Autowired
    public void setCounterService(CounterService counterService) {
        this.counterService = counterService;
    }

}