java - GSON parsing without a lot of classes

Question

I have the following JSON and I'm only interested in getting the elements "status", "lat" and "lng".

Using Gson, is it possible to parse this JSON to get those values without creating the whole classes structure representing the JSON content?

JSON:

{
  "result": {
    "geometry": {
      "location": {
        "lat": 45.80355369999999,
        "lng": 15.9363229
      }
    }
  },
  "status": "OK"
}

Answer 1

You don't need to define any new classes, you can simply use the JSON objects that come with the Gson library. Heres a simple example:

JsonParser parser = new JsonParser();
JsonObject rootObj = parser.parse(json).getAsJsonObject();
JsonObject locObj = rootObj.getAsJsonObject("result")
    .getAsJsonObject("geometry").getAsJsonObject("location");

String status = rootObj.get("status").getAsString();
String lat = locObj.get("lat").getAsString();
String lng = locObj.get("lng").getAsString();

System.out.printf("Status: %s, Latitude: %s, Longitude: %s
", status,
        lat, lng);

Plain and simple. If you find yourself repeating the same code over and over, then you can create classes to simplify the mapping and eliminate repetition.