public void escribirPersonaXStream(String rutaFichero, LinkedHashMap<Integer, Persona> personas) {
        XStream xstream = new XStream();
        rutaFichero = rutaFichero + ".xml";
        try {
            xstream.toXML(personas, new FileOutputStream(rutaFichero));
        } catch (Exception e) {
            //e.printStackTrace();
            System.out.println("Error en escibirPersonaXStream");
        }
    }