Programming/Spring
Spring - @RequiredArgsConstructor
잇(IT)
2023. 5. 31. 20:43
- 의존성 주입
1. Constructor(생성자)
2. Setter
3. Field
1. Constructor(생성자)
public class ExampleCase {
private final ChocolateService chocolateService;
private final DrinkService drinkService;
@Autowired
public ExampleCase(ChocolateService chocolateService, DrinkService drinkService) {
this.chocolateService = chocolateService;
this.drinkService = drinkService;
}
}2. Setter
public class ExampleCase{
private ChocolateService chocolateService;
private DrinkService drinkService;
@Autowired
public void setChocolateService(ChocolateService chocolateService){
this.chocolateService = chocolateService;
}
@Autowired
public void setDrinkService(DrinkService drinkService){
this.drinkService = drinkService;
}
}3. Field
public class ExampleCase{
@Autowired
private ChocolateService chocolateService;
@Autowired
private DrinkService drinkService;
}
- 생성자 주입의 단점은 위의 Constructor(생성자) 코드처럼 생성자를 만들기 번거롭다는 것이다.
- Lombok을 사용하여 간단한 방법으로 생성자 주입 장식의 코딩을 할 수 있다.
1. @RequiredArgsConstructor를 사용하지 않고 생성자 주입하는 방법
@Service
public class BannerServiceImpl implements BannerService {
private BannerRepository bannerRepository;
private CommonFileUtils commonFileUtils;
@Autowired
public BannerServiceImpl(BannerRepository bannerRepository, CommonFileUtils commonFileUtils) {
this.bannerRepository = bannerRepository;
this.commonFileUtils = commonFileUtils;
}
2. 필드 주입 방식을 사용한 Service
@Service
public class BannerServiceImpl implements BannerService {
@Autowired
private BannerRepository bannerRepository;
@Autowired
private CommonFileUtils commonFileUtils;
3. RequiredArgsConstructor를 활용한 생성자 주입
@Service
@RequiredArgsConstructor
public class BannerServiceImpl implements BannerService {
private final BannerRepository bannerRepository;
private final CommonFileUtils commonFileUtils;
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