Getting values by a previously unknown key in JSON (Java Gson)

I support Java test code for processing requests from the server using the Gson library. Everything was fine, until recently. Input data: there is an array of 28000 + rows, I will give the JSON part with the part of interest:

{
  "status": {
    "code": code,
    "message": "message"
  },
  "data": {
    "datas": [
      {
        "id": idHere,
        "date_gmt": "2020-08-04T07:01:47",
        "title": "title1",
        "status": "publish",
        "data_category": [
          263,
          495,
          492,
          68
        ],
        "is-bonus-data": false,
        "data-poster": "link here",
        "data-preview-sprite": "link here",
        "sprite": "link here",
        "data-links": {
          "3D 180 01_trailer": "link here",
          "3D 180 02_trailer": "link here",
          "3D 180 03_trailer": "link here",
          "3D 180 04_trailer": "link here",
          "3D 180 05_trailer": "link here"
        },
        "data-positions": [
          "data-positions1",
          "data-positions2"
        ],
        ...
}

This JSON is described in the class, and when it is received, everything is normally parsed, but ...
Recently, the "data-links" field began to receive objects with keys that differ from the "standard" ones - "3D 180 01_trailer_001", " 3D 360 03_trailer" etc. At first, it was decided to add these keys as a class field, and actually parse them as well, but the data-links class itself has already swollen to an incredible size.
A class that describes

public class DataLinks {
@SerializedName("3D 180 01_trailer")
@Expose
private String _3D18001Trailer;

@SerializedName("3D 180 02_trailer")
@Expose
private String _3D18002Trailer;

@SerializedName("3D 180 03_trailer")
@Expose
private String _3D1803KTrailer;

@SerializedName("3D 180 04_trailer")
@Expose
private String _3D1804KTrailer;

@SerializedName("3D 180 05_trailer")
@Expose
private String _3D18005Trailer;
}


Question: how to ensure that tests "pull out" values by keys that are unknown in advance? I looked at google answers, very different, where people give examples, the most suitable one was here: How to parse a dynamic JSON key in a nested JSON result, but the code starts spitting excepshenami when trying to adapt.

Author: Александр, 2020-08-05
Source

1 answers

You can use java.util.Map:

import com.google.gson.Gson;
import com.google.gson.annotations.SerializedName;
import lombok.Data;

import java.util.Map;
import java.util.stream.Collectors;

public class Main {

    @Data
    static class Test {

        @SerializedName("data-links")
        private Map<String, String> dataLinks;

    }

    public static void main(String[] args) {
        String json =
                "{" +
                "\"data-links\": {" +
                "\"3D 180 01_trailer\": \"link here\"," +
                "\"3D 180 02_trailer\": \"link here\"," +
                "\"3D 180 03_trailer\": \"link here\"," +
                "\"3D 180 04_trailer\": \"link here\"," +
                "\"3D 180 05_trailer\": \"link here\"" +
                "}" +
                "}";
        Test test = new Gson().fromJson(json, Test.class);
        System.out.println(
                test.dataLinks.entrySet().stream()
                        .map(e -> e.getKey() + ": " + e.getValue())
                        .collect(Collectors.joining("\n")));
    }

}

Result:

3D 180 01_trailer: link here
3D 180 02_trailer: link here
3D 180 03_trailer: link here
3D 180 04_trailer: link here
3D 180 05_trailer: link here
 1
Author: Alexandr, 2020-08-05 10:39:12