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국립공주대학교
GROWITH 프로젝트아름다운 프로젝트맛 탐정단Space Creation
경북대학교
  • App
  • Book
  • Lecture
  • 0 . . Template
  • 1 . Introduction.
  • 1 1. . About Spring
  • 1 2. . About Spring Boot
  • 1 3. . Dev. Environment
  • 1 4. . Hello World
  • 1 5. . Summary
  • 2 . Basic Database.
  • 2 1. . MySql & Heidi
  • 2 2. . JDBC
  • 2 3. . MyBatis
  • 2 4. . JPA
  • 2 5. . Summary
  • 3 . Basic Spring Security.
  • 3 1. . About Spring Security
  • 3 2. . Signup/Signin/Signout
  • 3 3. . Security Information
  • 3 4. . Fragment
  • 3 5. . Summary
  • 4 . Basic Project.
  • 4 1. . Question & Answer
  • 4 2. . Board & Reply
  • 4 3. . Cart & Product
  • 4 4. . Image Upload
  • 4 5. . Summary
  • 5 . Advanced Project.
  • 5 1. . Admin
  • 5 2. . Chat with Ajax
  • 5 3. . Other Login - Korean
  • 5 4. . Like & View Count
  • 5 5. . Summary
  • 6 . Expert Project.
  • 6 1. . Map - Korean
  • 6 2. . Mail - Korean
  • 6 3. . SMS - Korean
  • 6 4. . Credit Card - Korean
  • 6 5. . Summary
  • 7 . Frontend Project.
  • 7 1. . HTML/CSS/JS
  • 7 2. . Bootstrap
  • 7 3. . Theme
  • 7 4. . Etc
  • 7 5. . Summary
  • 8 . Mini Project.
  • 8 1. . Storyboard
  • 8 2. . Backend - Korean
  • 8 3. . Frontend
  • 8 4. . Portfolio
  • 8 5. . Summary
  • 9 . Deploy. Project.
  • 9 1. . AWS
  • 9 2. . Gabia
  • 9 3. . Domain
  • 9 4. . Etc
  • 9 5. . Summary
  • A 1. Bug Repost.
  • Appendix 0. .








  - 2 ways of DI (Dependencies Injection)

     

  1. Constructor Injection:
    • This method injects dependencies through the object's constructor.
    • Typically, dependencies are passed as arguments to the constructor of a class.
    • Injected dependencies are used within the class itself.
    • Using this method, dependencies are explicitly injected when the object is created, making them clearly visible and easier to manage when changes occur.


@RequiredArgsConstructor
@Service
public class UserServiceImpl implements UserService {

private final UserRepository userRepository;

@Override
 public void create(User user) {
userRepository.save(user);
}
}



  1. Field Injection:
    • This method injects dependencies directly into the class fields.
    • Injected dependencies are stored in the fields of the class, often provided externally.
    • Field Injection may reduce code readability since dependencies are not explicitly shown in the constructor, and it can make testing more difficult.



@Service
public class UserServiceImpl implements UserService {

@Autowired
private UserRepository userRepository;

@Override
 public void create(User user) {
userRepository.save(user);
}
}












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