public XsltTransformer(Document doc, String xslFile) throws Exception {
				this.xmlSource = convertXMLDoc2StreamSource(doc);
				this.xslSource = new StreamSource ( new FileReader( xslFile ) );
	}

	public String TransformXslt( ) throws Exception {
		String res = "";
		Transformer transformer = TransformerFactory.newInstance().newTransformer( xslSource );
		transformer.transform( xmlSource, new StreamResult( res ) );		
		return res; 
	}

--- in the servlet :

 try {
        	
	    	commandeXmlImpl cmd = new commandeXmlImpl(); 
	    	Document doc = cmd.retrieveAll();
	    	String path = getServletContext().getRealPath("/WEB-INF/xsl/liste.xsl");

	    	XsltTransformer xsltt = new XsltTransformer( doc, path );
	    	String result = xsltt.TransformXslt(); 
	    	out.println(result);
	    	out.close();
        } catch (Exception e) {
        	out.println(e.toString()); 
        }