java - 如何序列化来自同一对象中两个 url 的 json 数据？

Question

我有两个 url(urlA 和 urlB)，这两个 url 都以相同的 json 格式给我 json 响应。下面是我通过 urlA 调用返回的 JSON 字符串。为了便于理解，我将其缩短为只有三个 reportRecords。一般来说，它可能有超过 500 个 reportRecords

{
   "aggRecords": {
      "reportRecords": [
         {
            "min": 0,
            "max": 12,
            "avg": 0.3699187,
            "count": 246,
            "sumSq": 571,
            "stddev": 1.4779372,
            "median": 0,
            "percentileMap": {
               "95": 4
            },
            "metricName": "TransactionDuration",
            "dimensions": {
               "env": "dev",
               "pool": "titan",
               "Name": "PostProcessing",
               "Type": "PostProcessing"
            },
            "value": 91
         },
         {
            "min": 0,
            "max": 23,
            "avg": 2.3991289E-4,
            "count": 1463031,
            "sumSq": 3071,
            "stddev": 0.045814946,
            "median": 0,
            "percentileMap": {
               "95": 0
            },
            "metricName": "TransactionDuration",
            "dimensions": {
               "env": "dev",
               "pool": "titan",
               "Name": "ResourceContext",
               "Type": "ResourceContext"
            },
            "value": 351
         },
         {
            "min": 0,
            "max": 1209,
            "avg": 1.9203402,
            "count": 7344636,
            "sumSq": 71832774,
            "stddev": 2.4683187,
            "median": 2,
            "percentileMap": {
               "95": 4
            },
            "metricName": "TransactionDuration",
            "dimensions": {
               "env": "dev",
               "pool": "titan",
               "Name": "Client::Sync",
               "Type": "Client::Sync"
            },
            "value": 14104200
         }
      ]
   }
}

类似地，我还通过调用 urlB 得到另一个 JSON 响应，它的 json 格式与上面所示的完全相同。现在，使用下面的代码，我可以仅在 DataTransactionMetrics 对象中序列化来自 urlA 的上述 json 响应。

public class JSONParser {
    private static RestTemplate restTemplate = new RestTemplate();
    private static final Gson gson = new Gson();
    private static final String URLA = "urlA";
    private static final String URLB = "urlB";

    public static void main(String[] args) {
        String jsonTransactionLine = restTemplate.getForObject(URLA, String.class);
        System.out.println(jsonTransactionLine);

        JsonElement jelement = new JsonParser().parse(jsonTransactionLine);
        JsonObject jobject = jelement.getAsJsonObject();
        jobject = jobject.getAsJsonObject("aggRecords");
        JsonArray jarray = jobject.getAsJsonArray("reportRecords");

        Type type = new TypeToken<List<DataTransactionMetrics>>() {
        }.getType();
        List<DataTransactionMetrics> serializeRecord = gson.fromJson(jarray, type);

        // how can I serialize json data coming from URLB to serializeRecord object as well?
    }
}

下面是我的 DataTransactionMetrics 类 -

public class DataTransactionMetrics {

    private String metricName;
    private Map<String, Integer> percentileMap;
    private String median;
    private String stddev;
    private String sumSq;
    private String count;
    private String avg;
    private String max;
    private String min;

    // getters here

    public Dimensions dimensions;

    class Dimensions {
        private String env;
        private String pool;
        @SerializedName("Name")
        private String name;

        // getters here
    }
}

问题陈述:-

如何在同一个 serializeRecord 对象中序列化来自 urlB 的 json 响应，以便来自 url(urlA 和 urlB)的所有数据都存在于同一个 serializeRecord 对象中？这可以做到吗？

Answer 1

只需对 urlB 执行相同操作并连接两个结果列表即可:

static final Type listOfMetricsType = new TypeToken<List<DataTransactionMetrics>>() {}.getType();

private List<DataTransactionMetrics> loadMetrics(String url) {
    String jsonString = restTemplate.getForObject(URLA, String.class);

    JsonObject json = new JsonParser().parse(jsonString).getAsJsonObject();
    JsonArray jarr = json.getAsJsonObject("aggRecords").getAsJsonArray("reportRecords");

    return gson.fromJson(jarr, listOfMetrics);
}

public static void main(String[] args) {
    List<DataTransactionMetrics> metrics = loadMetrics(URLA);
    metrics.addAll(loadMetrics(URLB));

    // metrics now contains all metrics (from URLA and URLB)
}