How can I use Google GSON to deserialize a JSON array into a a Collection of a generic type? [duplicate]

Answer 1

I used JsonReader to deserialize json string as follow.

public class JSONReader {

    .....

    private Class persistentClass;

    public Class getPersistentClass() {
        if (persistentClass == null) {
            this.persistentClass = (Class) ((ParameterizedType) getClass().getGenericSuperclass()).getActualTypeArguments()[0];
        }
        return persistentClass;
    }

    public List read(Reader reader) throws IOException {
        JsonReader jsonReader = new JsonReader(reader);
        List objs = new ArrayList();
        jsonReader.beginArray();      
        while (jsonReader.hasNext()) {
            T obj = (new Gson()).fromJson(jsonReader, getPersistentClass());
            if (logger.isFine()) {
                logger.fine(obj.toString());
            }
            objs.add(obj);
        }
        jsonReader.endArray();
        jsonReader.close();
        return objs;
    }

    .....
}

You can call above method use below statements (convert Json string to StringReader, and pass StringReader object into the method):

public class Test extends JSONReader {

    .....

    public List parse(String jsonString) throws IOException {
        StringReader strReader = new StringReader(jsonString);
        List objs = read(strReader);
        return objs;
    }

    .....
}

Hopefully can works!