Controller 응답시 아래 클래스 사용

import lombok.Builder;
import org.springframework.http.HttpStatus;

@Builder
public class ResponseDto {
    private HttpStatus status;
    private String message;
    private Object data;
}

// 예시
@PostMapping("/user")
    public ResponseDto saveuser(@RequestBody @Valid User user) {
        Long id = userService.join(user);
        return ResponseDto.builder()
                .message("유저 등록 완료")
                .status(HttpStatus.OK)
                .data(new User())
                .build();
    }