public static void main(String[] args) {
 
        try {
            URL url = new URL (" ");
            String encoding = Base64.encode("username:password".getBytes(StandardCharsets.UTF_8));
 
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setRequestMethod("POST");
            connection.setDoOutput(true);
            connection.setRequestProperty  ("Authorization", "Basic " + encoding);
            InputStream content = (InputStream)connection.getInputStream();
            BufferedReader in   = 
                new BufferedReader (new InputStreamReader (content));
            String line;
            while ((line = in.readLine()) != null) {
                System.out.println(line);
            }
        } catch(Exception e) {
            e.printStackTrace();
        }
        JOptionPane.showMessageDialog(null,"Operación realizada correctamente");
    }