使用RestTemplate 接收請求返回值中的泛型

現有一個請求返回值的格式為：

{
	"success": true,
	"message": "",
	"code": 200,
	"result": {
		"returnCode": "03AD",
		"returnMsg": "AD3",
		"qrcode": "https://xxxxxxxxxx3xxxxxaaAAAAAA",
		"outTradeNo": "xxxxxx",
		"bankTradeNo": null,
		"msgId": "xxxx"
	},
	"timestamp": 16889873123011919
}

為了接收這個返回值，消費者這邊建立了一個實體類接收這個返回值（考慮到返回值中的result內容會隨著接口的改變而改變，使用了泛型）：

@Data
public class Result<T> implements Serializable {

	private static final long serialVersionUID = 1L;

	private boolean success;

	private String message;

	private Integer code;
	
	private T result;

	private long timestamp;
}

使用RestTemplate.postForEntity()向生產者發送請求：

HttpHeaders headers = new HttpHeaders();
headers.put("TOKEN_SCRIPT",Arrays.asList(appToken));
OrderDTO orderDTO = txnReqBody.getOtherData();
HttpEntity<OrderDTO> httpEntity = new HttpEntity<>(orderDTO,headers);
ResponseEntity<Result> resultResponseEntity = restTemplateHttps.postForEntity(payQrCodeUrl, httpEntity, Result<PayOrderQueryResponse>.class); --會出現編譯錯誤，不支持泛型

不使用泛型：

ResponseEntity<Result> resultResponseEntity = restTemplateHttps.postForEntity(payQrCodeUrl, httpEntity, Result.class);

發現result對象被解析成了LinkedHashMap

使用exchange加泛型解決問題

HttpHeaders headers = new HttpHeaders();
headers.put("TOKEN_SCRIPT",Arrays.asList(appToken));
OrderDTO orderDTO = txnReqBody.getOtherData();
HttpEntity<OrderDTO> httpEntity = new HttpEntity<>(orderDTO,headers);
ParameterizedTypeReference<Result<PayQrCodeResponse>> typeRef = new ParameterizedTypeReference<Result<PayQrCodeResponse>>() {};
ResponseEntity<Result<PayQrCodeResponse>> exchange = restTemplateHttps.exchange(payQrCodeUrl, HttpMethod.POST, httpEntity, typeRef);

解析正確。