try {
        if(nombre.length() == 0){
            JOptionPane.showMessageDialog(null, "ERROR 404");
            return false;
        }else{
            String urlLink = "http://localhost/ejercito/consulta.php?Nombre="+nombre;
            URL url = new URL(urlLink);



            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("GET");

            BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            StringBuffer sb = new StringBuffer();

             in.close();
            System.out.println(sb.toString());
            return true;
        }
    }catch(Exception x){
        JOptionPane.showMessageDialog(null, "ERROR 404");
        return false;
    }