如何将spring bean注入(custructor)到Mapstruct的抽象映射器中? [英] How to inject(custructor) a spring bean into abstract mapper of Mapstruct?

问题描述

我有以下映射器类，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.

I am having below mapper class in which I want to use CounterService. I am trying constructor injection but that's not working and null is printing.

@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;
    }

}

通过mapStruct

@Component
public class CarMapperImpl extends CarMapper{

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

如果我使用 @AutoWired 使用字段注入，那么它工作正常.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，需要一个子类来实例化?
mapStruct 有什么办法可以在实现类中创建一个构造函数:

If I use field injection using @AutoWired, that way it works fine. It means Spring doesn't support the constructor injection of abstract class. Is it because abstract class can't be instantiated directly and require a subclass to instantiate?
Is there any way mapStruct can create a constructor inside the implementation class as:

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

那样，构造函数注入应该可以工作.

That way, constructor injection should work.

推荐答案

这与 Spring 无关.MapStruct 团队经过深思熟虑决定不使用超级构造函数.

This has nothing to do with Spring. It was a deliberate decision done by the MapStruct team to not use super constructors.

你可以做的是使用 setter 注入.

What you can do though is to use setter injection.

@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;
    }

}

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