RestMemberController.java

import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;

@RestController
public class RestMemberController {

  private MemberDao memberDao;
  private MemberRegisterService registerService;

  ...

  @GetMapping("/api/members/{id}")
  public ResponseEntity<Object> member(@PathVariable Long id, HttpServletResponse response) throws IOException {
    Member member = memberDao.selectById(id);
    if (member == null) {
      return ResponseEntity.status(HttpStatus.NOT_FOUND).body(new ErrorResponse("no member"));
    }
    return ResponseEntity.status(HttpStatus.OK).body(member);
  }
  
  ...
}