使用 ObjectMapper 映射修剪后的响应或包装获得的响应

Question

详情---

我的一个 POJO SomeResponseObject 的 api 响应具有属性

@JsonProperty("s_summary")
private Map<String, SummaryObject> summary

它还有更多的属性。这些在 json 中总结如下：

{  
 "s_summary": {
    "rewardSubscription": {
      "accountId": "XYZ",
      "startDate": "2015-12-29T19:00:00+05:30",
      "endDate": "2017-06-21T00:00:00+05:30",
      "isActive": true,
      "entityId": "ID123",
      "status": "ACTIVE"
    }
  }
}

此 POJO(json) 由我们的服务进一步修改为 return 响应为：

{  
  "rewardSubscription": {
    "accountId": "XYZ",
    "startDate": "2015-12-29T19:00:00+05:30",
    "endDate": "2017-06-21T00:00:00+05:30",
    "isActive": true,
    "entityId": "ID123",
    "status": "ACTIVE"
  }
}

缩小范围---

现在我们正在针对此 API 调用编写测试。我们最终无法将响应映射到任何特定的 POJO（java 响应 class）。 测试代码-

JSONObject responseObject = new JSONObject(responseFromService.getResponseBody())
      .getJSONObject("RESPONSE");
ObjectMapper objectMapper = new ObjectMapper();
SomeResponseObject summaryResponse = objectMapper.getObjectMapper()
      .readValue(responseObject.toString(), SomeResponseObject.class); // And this wouldn't work.

问题--

有什么方法可以转换当前的 API 响应或以某种方式将其包装以映射到实际的 POJO(SomeResponseObject.class)？

提前致谢。

Answer 1

问题

您收到一个带有 rewardSubscription 字段的对象，或者，在您的情况下，是一张带有 rewardSubscription 键的地图。您不能将地图直接转换为 SomeResponseObject 类型的对象。

解决方案

选项 1

手动将 json 转换为地图并将其设置为 SomeResponseObject 实例：

JSONObject responseObject = new JSONObject(responseFromService.getResponseBody())
      .getJSONObject("RESPONSE");

ObjectMapper objectMapper = new ObjectMapper();
Map<String, SummaryObject> summaryMap = objectMapper.readValue(responseObject.toString(), new TypeReference<Map<String, SummaryObject>>() {});
SomeResponseObject response = new SomeResponseObject();
response.setSummaryMap(summaryMap);

选项 2

为了避免每次都手动转换地图，请编写一个 custom deserializer 来处理这两种情况。 deserialize 方法应该与此类似：

@Override
public SomeResponseObject deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException {
    ObjectMapper objectMapper = new ObjectMapper();
    JsonNode rootNode = jp.readValueAsTree();

    JsonNode sSummaryNode = rootNode.get("s_summary");
    if (sSummaryNode != null) {
        // Usual case.
        return objectMapper.treeToValue(sSummaryNode, SomeResponseObject.class);
    } else {
        // Special case - when received a map.
        Map<String, SummaryObject> summaryMap = objectMapper.readValue(rootNode.toString(), new TypeReference<Map<String, SummaryObject>>() {});
        SomeResponseObject response = new SomeResponseObject();
        response.setSummaryMap(summaryMap);
        return response;
    }
}

然后在你不关心的代码中：

ObjectMapper objectMapper = new ObjectMapper();
SomeResponseObject response = objectMapper.readValue(json, SomeResponseObject.class);

使用 ObjectMapper 映射修剪后的响应或包装获得的响应

Mapping a trimmed response using ObjectMapper Or wrapping the response obtained

java

json

pojo

objectmapper

问题

解决方案

选项 1

选项 2