Gson to HashMap

Question

Is there a way to convert a String containing json to a HashMap, where every key is a json-key and the value is the value of the json-key? The json has no nested values. I am using the Gson lib.

For example, given JSON:

{ "id":3, "location":"NewYork" } 

resulting HashMap:

<"id", "3"> <"location", "NewYork"> 

Thanks

Answer 1

Use TypeToken, as per the GSON FAQ:

Gson gson = new Gson(); Type stringStringMap = new TypeToken<Map<String, String>>(){}.getType(); Map<String,String> map = gson.fromJson(json, stringStringMap); 

No casting. No unnecessary object creation.

Answer 2

If I use the TypeToken solution with a Map<Enum, Object> I get "duplicate key: null".

The best solution for me is:

String json = "{\"id\":3,\"location\":\"NewYork\"}"; Gson gson = new Gson(); Map<String, Object> map = new HashMap<String, Object>(); map = (Map<String, Object>)gson.fromJson(json, map.getClass()); 

Result:

{id=3.0, location=NewYork}