Generate XML from a text file in Java

This is my text file:

5625145214 6
8562320154 2
8542154157 5
6325145214 5
5214214584 6
5625142224 3
8562456754 1

I want to use XStream to generate XML file:

This is my code:

    private static void generateXml() throws IOException {
    XStream xStream = new XStream(new DomDriver());

    String line = null;
    try (BufferedReader br = new BufferedReader(new FileReader("Unique Numbers.txt"))) {
        while ((line = br.readLine()) != null) {
            String xml = xStream.toXML(line);
            System.out.println(xml);
        }
    }

}

How can i generate xml file? I need it.