public WxMpOAuth2AccessToken deserialize(
      JsonElement json, Type typeOfT, JsonDeserializationContext context)
      throws JsonParseException {
    WxMpOAuth2AccessToken accessToken = new WxMpOAuth2AccessToken();
    JsonObject accessTokenJsonObject = json.getAsJsonObject();

    if (accessTokenJsonObject.get("access_token") != null
        && !accessTokenJsonObject.get("access_token").isJsonNull()) {
      accessToken.setAccessToken(GsonHelper.getAsString(accessTokenJsonObject.get("access_token")));
    }
    if (accessTokenJsonObject.get("expires_in") != null
        && !accessTokenJsonObject.get("expires_in").isJsonNull()) {
      accessToken.setExpiresIn(
          GsonHelper.getAsPrimitiveInt(accessTokenJsonObject.get("expires_in")));
    }
    if (accessTokenJsonObject.get("refresh_token") != null
        && !accessTokenJsonObject.get("refresh_token").isJsonNull()) {
      accessToken.setRefreshToken(
          GsonHelper.getAsString(accessTokenJsonObject.get("refresh_token")));
    }
    if (accessTokenJsonObject.get("openid") != null
        && !accessTokenJsonObject.get("openid").isJsonNull()) {
      accessToken.setOpenId(GsonHelper.getAsString(accessTokenJsonObject.get("openid")));
    }
    if (accessTokenJsonObject.get("scope") != null
        && !accessTokenJsonObject.get("scope").isJsonNull()) {
      accessToken.setScope(GsonHelper.getAsString(accessTokenJsonObject.get("scope")));
    }
    return accessToken;
  }