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
,这样就可以正常工作了。这意味着Spring不支持构造函数注入abstract
班级。是不是因为abstract
类不能直接实例化,需要子类来实例化?
有什么办法吗mapStruct
可以在实现类中创建一个构造函数,如下所示:
public CarMapperImpl(CounterService counterService){
super(counterService);
}
这样,构造函数注入应该可以工作。
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;
}
}
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