尝试使用 RestTemplate 获取对象列表时响应主体为空

Question

所以我正在开发一个 REST 客户端，它使用一个 REST API 来使用 Spring RestTemplate 获取 json 对象列表。我正在使用 api 键设置必要的标题。所以我得到一个 HTTP 200 OK 响应，但响应正文是空的。当我使用 Postman 执行相同的请求时，它运行良好。这可能是什么原因？

代码sn-p：

 public List<PoyntSubscription> getSubscriptions(String apiToken, String cloudId, String cloudBaseUrl) {
    List<PoyntSubscription> subscriptions = new ArrayList<>();

    RestTemplate restTemplate = new RestTemplate();
    HttpHeaders headers = new HttpHeaders();
    headers.setContentType(MediaType.APPLICATION_JSON);
    headers.set("Api-Version", "1.2");
    headers.set("Authorization", apiToken);
    HttpEntity entity = new HttpEntity(headers);

    ResponseEntity<PoyntSubscription> response = restTemplate.exchange(
            cloudBaseUrl + cloudId + "/subscriptions?start=10", HttpMethod.GET, entity, PoyntSubcriptionsList.class);
    return response.getBody().getSubscriptions();
}

当 API 被邮递员使用时我得到的响应 json：

{
"list": [
    {
        "startAt": "2019-01-22T00:00:00Z",
        "paymentStatus": "OVERDUE",
        "createdAt": "2019-01-22T03:05:28Z",
        "updatedAt": "2019-02-21T03:05:28Z",
        "businessId": "xxxx",
        "appId": "xxxx",
        "subscriptionId": "xxxxx",
        "phase": "FULL",
        "planId": "xxxx",
        "bundleId": "xxxx",
        "planName": "xxxx",
        "status": "ACTIVE"
    }
 ],
 "start": 10,
 "total": 14,
 "count": 4
}

PoyntSubscription 包装类：

public class PoyntSubcriptionsList {
private List<PoyntSubscription> subscriptions = new ArrayList();

public PoyntSubcriptionsList() {
}

public List<PoyntSubscription> getSubscriptions() {
    return this.subscriptions;
}

public void setSubscriptions(List<PoyntSubscription> subscriptions) {
    this.subscriptions = subscriptions;
 }
}

PoyntSubscription 类：

public class PoyntSubscription {
private String startedDate;
private String paymentStatus;
private String createdDate;
private String updatedDate;
private String businessId;
private String appId;
private String subscriptionId;
private String phase;
private String planId;
private String bundleId;
private String planName;
private String status;

public PoyntSubscription() {
}

Answer 1

在PoyntSubcriptionsList 类中用@JsonGetter("list") 注释getSubscriptions()。

您还需要将ResponseEntity<PoyntSubscription> response 更改为ResponseEntity<PoyntSubcriptionsList> response，因为PoyntSubcriptionsList 代表您的JSON。