public LinkedHashMap<Integer, Persona> leerPersonaXStream(String rutaFichero) {
        XStream xstream = new XStream();
        rutaFichero = rutaFichero + ".xml";
        LinkedHashMap<Integer, Persona> personas = new LinkedHashMap<>();
        try {
            personas = (LinkedHashMap<Integer, Persona>) xstream.fromXML(new FileInputStream(rutaFichero));
        } catch (FileNotFoundException ex) {
            Logger.getLogger(FicherosDatos.class.getName()).log(Level.SEVERE, null, ex);
            System.out.println("Error en leerPersonasXStream");
        }
        return personas;
    }