calling rest service

Hi friends, I need help please,

I´m trying  to call my rest service but I have problems when I try to use bufferedReader,  InputStreamReader or TypeI dont know what to do.

Please if you help me.

I´m trying this

public Usuario login(Usuario usuario) throws UnsupportedEncodingException, IOException {

    DefaultHttpClient httpClient = new DefaultHttpClient();
    HttpPost postRequest = new HttpPost(URL_DSCPACE + "login");

    Gson gson = new Gson();
    String usuarioJson = gson.toJson(usuario);
    StringEntity input = new StringEntity(usuarioJson);
    input.setContentType(JSON_FORMAT);
    postRequest.setEntity(input);

    HttpResponse response = httpClient.execute(postRequest);

    if (response.getStatusLine().getStatusCode() != 200) {
        throw new RuntimeException("Failed : HTTP error code : " + response.getStatusLine().getStatusCode());
    }

    BufferedReader br = new BufferedReader(
            new InputStreamReader((response.getEntity().getContent())));

    String output, token = "";
    while ((output = br.readLine()) != null) {
        token += output;
    }
    usuario.setToken(token);
    httpClient.getConnectionManager().shutdown();

    return usuario;
}

Gson gson = new Gson();
Type listType = new TypeToken<List<Comunidades>>() {}.getType();
List<Comunidades> comunidades = gson.fromJson(resJson, listType);
return comunidades;

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