Parse list of json string using GSON

Question

I am working on a REST application and the response I get from the server is a string of Json with the following format:

[{"car": "ford"}, {"car": "nissan"}, {"car": "bmw"}]

I want to use Gson to retrieve information by key through each element in that list, but because it is returned as a string I'm not sure how to go about it.

If I simply had the response be:

String json = {"car:": "ford"};

Then I could retrieve the car's value as follows:

  Map<String,Object> result = new Gson().fromJson(json, Map.class);
  System.out.println( result.get( "car" ) );

But because the original string is a list of json's it's more difficult.

Help appreciated. Ideally still using the Gson class

Thanks

Are all your keys car? If so, does using a map make sense? This looks much more like a list of objects to me with each object having a car field. — Asthor
– Asthor, Commented Dec 7, 2018 at 11:25

Mohsen · Accepted Answer · 2018-12-07 11:12:45Z

1

This will helps you:

public static void main(String[] args) {
    JsonParser jsonParser = new JsonParser();
    String log = "[{\"car\": \"ford\"}, {\"car\": \"nissan\"}, {\"car\": \"bmw\"}]";
    JsonArray jsonObject = jsonParser.parse(log).getAsJsonArray();
    for (JsonElement jsonElement : jsonObject)
        System.out.println(jsonElement.getAsJsonObject().get("car").getAsString());

}

answered Dec 7, 2018 at 11:12

Mohsen

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Aditya Narayan Dixit · Accepted Answer · 2018-12-07 11:11:30Z

0

The json string you have is actually an array. Try below:

  String json = "[{\"car\": \"ford\"}, {\"car\": \"nissan\"}, {\"car\": \"bmw\"}]";
  List<Map<String,Object>> result = new Gson().fromJson(json, List.class);
  result.forEach(l ->{
    l.forEach((k, v)->{
      System.out.println(k + ": " + v);
    });
  });

answered Dec 7, 2018 at 11:11

Aditya Narayan Dixit

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