Library to convert JSON to urlencoded

Question

We are doing some integration towards a quite inconsistent (Zurmo-)REST API. The API only accepts urlencoded strings as its payload in the http posts, but it answers with JSON.

Answer 1

public static String objectToUrlEncodedString(Object object, Gson gson) {
    return jsonToUrlEncodedString((JsonObject) new JsonParser().parse(gson.toJson(object)));
}

private static String jsonToUrlEncodedString(JsonObject jsonObject) {
    return jsonToUrlEncodedString(jsonObject, "");
}

private static String jsonToUrlEncodedString(JsonObject jsonObject, String prefix) {
    String urlString = "";
    for (Map.Entry item : jsonObject.entrySet()) {
        if (item.getValue() != null && item.getValue().isJsonObject()) {
            urlString += jsonToUrlEncodedString(
                    item.getValue().getAsJsonObject(),
                    prefix.isEmpty() ? item.getKey() : prefix + "[" + item.getKey() + "]"
            );
        } else {
            urlString += prefix.isEmpty() ?
                    item.getKey() + "=" + item.getValue().getAsString() + "&" :
                    prefix + "[" + item.getKey() + "]=" + item.getValue().getAsString() + "&";
        }
    }
    return urlString;
}