Spring CORE

Spring CORE 학습 테스트

1. scan
   • @Component
     DAO에 선언함으로써 LineDao가 스프링 빈으로 등록됨
   • @Service
     Service에 선언함으로써 LineService가 스프링 빈으로 등록됨
2. di
   의존성 주입은 생성자 혹은 팩토리 메서드에 의해 주입된다.
   컨테이너는 빈을 생성할 때 이러한 의존성을 주입한다.
   • construnctor injection

     @Service
     public class StationConstructorService {
      private StationRepository stationRepository;
      public StationConstructorService(StationRepository stationRepository) {
        this.stationRepository = stationRepository;
      }
      public String sayHi() {
        return stationRepository.sayHi();
      }
     }
     

• setter injection

  @Service
  public class StationSetterService {
    private StationRepository stationRepository;
    @Autowired
    public void setStationRepository(StationRepository stationRepository) {
        this.stationRepository = stationRepository;
    }
    public String sayHi() {
        return stationRepository.sayHi();
    }
  }
  

• field injection
  @Autowired를 생성자에 붙여서 초기화하여 주입

  @Service
  public class StationFieldService {
    @Autowired
    private StationRepository stationRepository;
  
    public String sayHi() {
        return stationRepository.sayHi();
    }
  }