如何将响应转换为 responseEntity

Question

您好，我的服务出现问题，提示“发生内部服务器错误异常！异常详细信息：IdentificationResponse 无法转换为 org.springframework.http.ResponseEntity””对此事有何帮助？

下面是我的代码块；

我的身份识别服务实现；

Slf4j
@Service
@RequiredArgsConstructor
public class IdentificationServiceImpl implements IdentificationService {

    private final RestTemplate restTemplate;

    @Value("${platform.url}")
    private String platform;

    private final ServiceConfig serviceConfig;

    @Override
    public ResponseEntity<IdentificationResponse> createIdentification(Request request) {

        IdentificationRequest identificationRequest = new IdentificationRequest(serviceConfig.getIssuerKey(), serviceConfig.getSecureKey());

        identificationRequest.setOperation(ClientConstants.CREATE_IDENTIFICATION_ADD);

        HttpEntity<IdentificationRequest> requestHttpEntity = new HttpEntity<>(IdentificationRequest);

        ResponseEntity<IdentificationResponse> response = restTemplate.exchange(platform, HttpMethod.POST, requestHttpEntity, IdentificationResponse.class);

        return HandleResponse.handleResponse(response);
    }

下面是我的句柄响应类；

public static <T> T handleResponse(ResponseEntity response) {
        HttpStatus code = response.getStatusCode();
        if (code == HttpStatus.OK || code == HttpStatus.CREATED) {
            return (T) response.getBody();

        } else if (code == HttpStatus.NO_CONTENT) {
            return null;
        } else if (code == HttpStatus.BAD_REQUEST)
            throw new BadRequestException("BadRequest Exception occured while requesting! Exception details: " + response.getBody());
        else if (code == HttpStatus.UNAUTHORIZED)
            throw new UnauthorizedException("Unauthorized Exception occured while requesting! Exception details: " + response.getBody());
        else
            throw new HttpClientException("Exception occured! Exception details: " + response.getBody(), code.value());
    }
}

下面是我的 IdentificationRequest 类；

 @Data
 public class IdentificationRequest {

    @Setter(AccessLevel.NONE)
    @NotNull
    @JsonProperty("IssuerKey")
    private String issuerKey;
    @Setter(AccessLevel.NONE)
    @NotNull
    @JsonProperty("SecurityKey")
    private String secureKey;
    @NotNull
    @JsonProperty("TransactionId")
    private String transactionId;
    @NotNull
    @JsonProperty("TransactionDate")
    @DateTimeFormat(pattern = "YYYY-MM-DD HH:mm:ss.SSS")
    private String transactionDate;
    @NotNull
    @JsonProperty("Msisdn")
    @Pattern(regexp = "^905.{9}", message = "must be of 12 char/digit")
    private Long msisdn;
    private String operation;
    @NotNull
    @JsonProperty("Package")
    private String Package;
    @NotNull
    @JsonProperty("STB")
    private Boolean isStb;
    @JsonProperty("STB_SerialNumber")
    private String stbSerialNumber;
    @JsonProperty("STB_MacAddress")
    private String stbMacAddress;

    public IdentificationRequest(String issuerKey, String secureKey) {
        this.issuerKey = issuerKey;
        this.secureKey = secureKey;
    }
}

下面是我的请求类；

@Data
public class Request {
    @JsonProperty("OrderId")
    private String orderId;

    @JsonProperty("OrderItemId")
    private String orderItemId;

    @JsonProperty("ProcessInstanceId")
    private String processId;

    @JsonProperty("step_id")
    private String stepId;

    @JsonProperty("step_name")
    private String stepName;

下面是我的响应类；

@Data
public class IdentificationResponse {

    @JsonProperty("IsSuccessful")
    private Boolean isSuccessful;
    @JsonProperty("Code")
    private Integer code;
    @JsonProperty("Message")
    private String message;
    @JsonProperty("Data")
    private Object data;
}

我需要地图来响应响应实体吗？

Answer 1

根据您的代码，当您调用 response.getBody() 方法时，您将获得 IdentificationResponse 并将其转换为 ResponseEntity这是抛出 ClassCastException。

  if (code == HttpStatus.OK || code == HttpStatus.CREATED)
      return (T) response.getBody();

您可以直接返回 response 而不是 response.getBody() 来解决您的问题，或者如果您想要您的 createIdentification 方法返回 IdentificationResponse 实例

return HandleResponse.handleResponse(response, IdentificationResponse.class);

 public static <T> T handleResponse(ResponseEntity response, Class<T> type) {
        HttpStatus code = response.getStatusCode();
        if (code == HttpStatus.OK || code == HttpStatus.CREATED)
            return (T) response.getBody();
 }

您可以找到更多与泛型相关的信息here

Answer 2

基本上，您试图将一个对象转换为一个不兼容的对象，如果两个对象都实现相同的接口或对象的层次结构允许，则可以进行转换，如果无法实现此转换，最好根据您检索到的对象的值创建响应对象的实例。