likelion-homepage

프로젝트 생성 spring boot 프로젝트를 생성하고 필요한 라이브러리를 끌어옵니다.

gitignore 설정

application.properties에서 mysql을 사용하기위한 설정을 작성

spring.application.name=likelion

#DB (local) spring.datasource.url=jdbc:mysql://localhost:3306/likelion spring.datasource.username=root spring.datasource.password=1234

#show SQL spring.jpa.properties.hibernate.format_sql=true

spring.jpa.hibernate.ddl-auto=create

ResposeEntity를 사용하여 각종 api에 대한 응답을 보냅니다.

public class SimpleTestController {

@GetMapping("/success")
public String simpleTextSuccess() { return "안녕"; }

@GetMapping("/fail")
public ResponseEntity simpleTextFail() {
return ResponseEntity.status(HttpStatus.BAD_REQUEST) .body("실패"); } }

본격적으로 ResposeEntity를 활용합니다(CustomApiResponse작성밎 활용)

CustomApiResponse

public class CustomApiResponse { private int status; private T data;

private String message;

public static <T> CustomApiResponse<T> createSuccess(int status, T data, String message){
    return new CustomApiResponse<>(status, data, message);
}
public static <T> CustomApiResponse<T> createFailWithout(int status,String message){
    return new CustomApiResponse<>(status, null,message);
}

}

활용

public class CustomTestController {
@PostMapping("/simple")
public ResponseEntity<CustomApiResponse<?>> simple() { CustomApiResponse responseBody = CustomApiResponse.createSuccess(HttpStatus.OK.value(), null, "회원가입에 성공하였습니다");
return ResponseEntity.status(HttpStatus.OK).body(responseBody);
}

@GetMapping("/jsonData")
public ResponseEntity<CustomApiResponse<?>> jsonData() {
    //SimpleDto dto = new SimpleDto("example", "[email protected]");
    SimpleDto dto = SimpleDto.builder()
            .userid("example")
            .email("[email protected]")
            .build();

    CustomApiResponse<Object> responseBody = CustomApiResponse.createSuccess(HttpStatus.OK.value(), dto, "회원 조회에 성공하였습니다");
    return ResponseEntity.status(HttpStatus.OK).body(responseBody);
}

}

api에서 오류를 반환할때

public class CustomErrorController implements ErrorController { @RequestMapping("/error")
public ResponseEntity<CustomApiResponse<?>> handleError(HttpServletRequest request) {
//HttpServletRequest 로부터 status code 가져오기 Object status = request.getAttribute(RequestDispatcher.ERROR_STATUS_CODE);
if (status != null)
{

        int statusCode= Integer.parseInt(status.toString());
        // Bad Request (400)
        if (statusCode ==400)//statusCode ==HttpStatus.BAD_REQUEST.value())
        {
            return ResponseEntity
                    .status(HttpStatus.BAD_REQUEST)
                    .body(new CustomApiResponse<>(HttpStatus.BAD_REQUEST.value(),null,"잘못된 요청입니다."));
        }

        //Forbidden (403)
        else if (statusCode ==403)//statusCode ==HttpStatus.FORBIDDEN.value())
        {
            return ResponseEntity
                    .status(HttpStatus.FORBIDDEN)
                    .body(new CustomApiResponse<>(HttpStatus.FORBIDDEN.value(),null,"접근이 금지되었습니다."));
        }
        //Notfound (404)
        else if (statusCode ==404)//statusCode ==HttpStatus.NOT_FOUND.value())
        {
            return ResponseEntity
                    .status(HttpStatus.NOT_FOUND)
                    .body(new CustomApiResponse<>(HttpStatus.NOT_FOUND.value(),null,"페이지를 찾을수없습니다."));
        }
        //Method Not Allowed (405)
        else if (statusCode ==405)//statusCode ==HttpStatus.METHOD_NOT_ALLOWED.value())
        {
            return ResponseEntity
                    .status(HttpStatus.METHOD_NOT_ALLOWED)
                    .body(new CustomApiResponse<>(HttpStatus.METHOD_NOT_ALLOWED.value(),null,"허용되지 않은 페이지 입니다."));
        }
        //Server Internet error (500)
        else{
            return ResponseEntity
                    .status(HttpStatus.INTERNAL_SERVER_ERROR)
                    .body(new CustomApiResponse<>(HttpStatus.INTERNAL_SERVER_ERROR.value(),null,"내부 서버 오류가 발생하였습니다."));
        }
    }
    else{
        return ResponseEntity
                .status(HttpStatus.INTERNAL_SERVER_ERROR)
                .body(new CustomApiResponse<>(HttpStatus.INTERNAL_SERVER_ERROR.value(),null,"내부 서버 오류가 발생하였습니다."));
    }
}

}

회원가입 api 작성

public class UserService {

private final UserRepository userRepository;

//회원가입 작성~
public ResponseEntity<CustomApiResponse<?>>signup(UserSignupDto dto){
    // 회원이 존재하는지? -> userId 고유하기때문
    Optional<User> findUser = userRepository.findByUserId(dto.getUserId());

    //동일한 userId의 경우 회원가입 불가 -> CustomApiResponse create Fail 데이터 반환\
    if(findUser.isPresent()){
        return ResponseEntity.status(HttpStatus.BAD_REQUEST)
                .body(CustomApiResponse.createFailWithout(HttpStatus.BAD_REQUEST.value(), "중복된 아이디 입니다."));

    }
    //동일한 userId가 없다 -> 회원가입 진행
    User   newUser = User.builder()
            .userId(dto.getUserId())
            .email(dto.getEmail())
            .password(dto.getPassword())
            .build();
    // 새로운 user 저장
    userRepository.save(newUser);
    return  ResponseEntity
            .status(HttpStatus.OK)
            .body(CustomApiResponse.createSuccess(HttpStatus.OK.value(), null,"회원가입에 성공하였습니다."));

}

}