public static URL getUrlForPage(String pageAdress){
        try {
            return new URL(pageAdress);
        } catch (MalformedURLException e) {
            e.printStackTrace();
        }

        return null;
    }

    public static String downloadPageToString(URL url){
        String res = "";
        InputStream is;
        BufferedReader br;
        try {
            is = url.openStream();
            if(is != null){
                br = new BufferedReader(new InputStreamReader(is));

                String line;
                while ((line = br.readLine()) != null) {
                    res += line;
                }

                return res;
            }
        } catch (IOException e) {
            e.printStackTrace();
        }

        return "";
    }

    private static ArrayList<Integer> loadDoctorInInstitutionJSON(String json){
        ArrayList<Integer> res = new ArrayList<>();

        JSONArray ja = null;
        try {
            ja = new JSONArray(json);
            for(int i=0;i<ja.length();i++){
                JSONObject jo = ja.getJSONObject(i);

                res.add(jo.getInt("DoctorID"));
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }

        return res;
    }




    loadDoctorInInstitutionJSON(downloadPageToString(getUrlForPage("adresa_stranky.php")));