Spring Boot 如何自定义返回错误码错误信息

INTERNAL_SERVER_ERROR(500, "Internal Server Error"),

public enum ErrorEnum {
  /*
   * 错误信息
   * */
  E_20011(20011, "缺少必填参数"),
  ;
  private Integer errorCode;
  private String errorMsg;
  ErrorEnum(Integer errorCode, String errorMsg) {
    this.errorCode = errorCode;
    this.errorMsg = errorMsg;
  }
  public Integer getErrorCode() {
    return errorCode;
  }
  public String getErrorMsg() {
    return errorMsg;
  }

public class BusinessException extends RuntimeException {
  private static final long serialVersionUID = 1L;
  private Integer code;
  /**
   * @param errorEnum 以错误的ErrorEnum做参数
   */
  public BusinessException(ErrorEnum errorEnum) {
    super(errorEnum.getErrorMsg());
    this.code = errorEnum.getErrorCode();
    this.resultJson = CommonUtil.errorJson(errorEnum);
  }
  public Integer getCode() {
    return code;
  }
  public void setCode(Integer code) {
    this.code = code;
  }
}

public class ExceptionResponse {
  private String message;
  private Integer code;
  public ExceptionResponse(Integer code, String message) {
    this.message = message;
    this.code = code;
  }
  public static ExceptionResponse create(Integer code, String message) {
    return new ExceptionResponse(code, message);
  }
  public Integer getCode() {
    return code;
  }
  public String getMessage() {
    return message;
  }
}

@ControllerAdvice
@Slf4j
public class ExceptionHandler {

  @ResponseBody
  @ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)
  @ExceptionHandler(Exception.class)
  public ExceptionResponse handleException(Exception ex) {
    if (ex instanceof BusinessException) {
      log.warn(ex.getMessage(), ex);
      BusinessException businessException = (BusinessException) ex;
      return ExceptionResponse.create(businessException.getCode(), businessException.getMessage());
    } else {
      log.error(ex.getMessage(), ex);
      return ExceptionResponse.create(HttpStatus.INTERNAL_SERVER_ERROR.value(), ex.getMessage());
    }
  }
}

@PostMapping("test/exception")
  public String testException() {
    throw new BusinessException(ErrorEnum.E_20011);
  }

{ "message": "缺少必填参数", "code": 20011 }