중간프로젝트 회원가입 기능 구현하기

오늘 만난 에러 확인하기

작업한 코드

• User

@Getter
@NoArgsConstructor
@Entity
@Table(name = "users")
public class User {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    @Column(nullable = false, unique = true)
    private String username;

    @Column(nullable = false)
    private String password;

    public User(String username, String password) {
        this.username = username;
        this.password = password;
    }
}

• UserRepository

public interface UserRepository extends JpaRepository<User, Long> {
    Optional<User> findByUsername(String username);
}

• UserService

@RequiredArgsConstructor
@Service
public class UserService {
    private final UserRepository userRepository;

    @Transactional
    public void createUser(CreateUserRequest createUserRequest) {
        String username = createUserRequest.getUsername();
        Optional<User> found = userRepository.findByUsername(username);
        if (found.isPresent()) {
            throw new IllegalArgumentException("중복된 이름입니다.");
        }
        User user = new User(createUserRequest.getUsername(), createUserRequest.getPassword());
        userRepository.save(user);
    }
}

• UserController

@RestController
@RequiredArgsConstructor
public class UserController {
    private final UserService userService;
    @PostMapping("/api/signup")
    public CreateUserResponse createUser(@RequestBody @Valid CreateUserRequest createUserRequest) {
        userService.createUser(createUserRequest);
        return new CreateUserResponse(200L, "회원가입 완료");
    }
}

• CreateUserRequest

@Getter
public class CreateUserRequest {
    @Pattern(regexp = "^(?=.*[a-z])(?=.*[0-9])[a-z0-9]{4,10}$", message = "최소 4자 이상, 10자 이하이며 알파벳 소문자(a~z), 숫자(0~9)로 구성되어야 합니다.")
    private String username;
    @Pattern(regexp = "^(?=.*[A-Za-z])(?=.*[0-9])[A-Za-z0-9]{8,15}$", message = "최소 8자 이상, 15자 이하이며 알파벳 대소문자(a~z, A~Z), 숫자(0~9)로 구성되어야 합니다.")
    private String password;

}

• CreateUserResponse

@Getter
public class CreateUserResponse {
    private final Long statusCode;
    private final String statusMessage;
    public CreateUserResponse(Long statusCode, String statusMessage) {
        this.statusCode = statusCode;
        this.statusMessage = statusMessage;
    }
}

• build.gradle(@Vaild 사용하기 위해 추가)

// https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-validation
implementation group: 'org.springframework.boot', name: 'spring-boot-starter-validation'