public class GsonConvert implements Converter {
  private static final Gson GSON = new Gson();

  @Override
  public <S, F> SimpleResponse<S, F> convert(Type succeed, Type failed, Response response,
      boolean fromCache) throws Exception {

    S succeedData = null;
    F failedData = null;
    String JSON = response.body().string();
    JSON = Net.decrypt(JSON);

    if (Net.printResponse) {
      LogCat.r("JSON", JSON);
    } else {
      LogCat.json("响应体", JSON);
    }

    int code = response.code();

    // 解析服务器错误码
    if (code >= 200 && code < 300) {
      JSONObject jsonObject = null;
      try {
        jsonObject = new JSONObject(JSON);
      } catch (JSONException e) {
        e.printStackTrace();
        failedData = (F) "无法解析错误信息";
      }

      // 解析后台自定义错误码
      int customCode = jsonObject.optInt("code");
      if (customCode == 1) {
        {
          try {
            succeedData = GSON.fromJson(JSON, succeed);
          } catch (JsonSyntaxException e) {
            e.printStackTrace();
            failedData = (F) "无法解析数据";
          }
        }
      } else {
        failedData = (F) jsonObject.optString("msg");
        code = customCode;
      }

    } else if (code >= 400 && code < 500) {
      failedData = (F) "发生异常错误";
    } else if (code >= 500) {
      failedData = (F) "服务器开小差啦";
    }

    return SimpleResponse.<S, F>newBuilder()
        .code(code)
        .headers(response.headers())
        .fromCache(fromCache)
        .succeed(succeedData)
        .failed(failedData)
        .build();
  }
}