Gson and only concentrate on inner object

问题

Ok I have a json coming in that looks like this:

{count:xxx, important:[{...}]}

All I care about is the important object. Is there anything I can do with a custom deserializer or anything where I can just have GSON deserialize that important json object?

Also the way I want the deserialized object to look is like this:

List<Important> = Gson.fromJson(arg0, new TypeToken<ArrayList<Important>>(){}.getType() );

回答1:

Yes, you can use the JsonParser class from the Gson library to read it as a JsonObject. Then, pull out the inner object you need and use Gson to fill your java class with it.

Example:

Reader jsonReader =
                new BufferedReader(
                new InputStreamReader(getIStream("myFile.json")));
JsonParser parser = new JsonParser();
JsonObject top = parser.parse(jsonReader).getAsJsonObject();

JsonElement importantEl = top.get("important");

//Parse the important element into whatever structure you're creating
Gson gson = new Gson();
List<Important> important 
    = Gson.fromJson(importantEl, new TypeToken<ArrayList<Important>>(){}.getType() );

来源：https://stackoverflow.com/questions/12825229/gson-and-only-concentrate-on-inner-object