File xml = new File(esito.getPath(), esito.getFilename());
InputStream xsl = Utilities.getXSLEsito(esito);//recupero il foglio di stile in base all'esito
Source xmlSource = new StreamSource(xml);//esito da mostrare
Source xslSource = new StreamSource(xsl);
StreamResult result = new StreamResult(html);
try {
    TransformerFactory factory = TransformerFactory.newInstance();
    Templates template = factory.newTemplates(xslSource);
    Transformer transformer = template.newTransformer();
    transformer.transform(xmlSource, result);
    dh = new DataHandler(new FileDataSource(html));
} catch (TransformerException ex) {
    return new DataHandler(new FileDataSource(xml));
} finally {
    xsl.close();
}