XPATH in a XML Document

Question

Hi guys, I need again your help.
I have many xml documents and I need create a class that "search" data at this xml documents. What I can do this!?!?
For example, I wanna get the Paul ages in the age.xml document!!!!! I wanna create a method like this:
SearchXmlfile search = new SearchXmlFile();
String result = search.get("/person@age[person@attribute = 'paul']"); //I pass the xpath like parameter
Someone know What I can do this?!!?
Just another question. When I create a transformer I set the Source and Result "Objects" (SAX, DOM or Stream). And where i set the xsl file?!!? I am reading the jwsdp tutorial and I don't understand where I configure the xsl file transformer to the transformer object!!!!
Thanks Again.
Giscard.

Answer 1

1. For selecting nodes with an XPath expression parse with the JDom parser and select nodes with the XPath class.
http://www.jdom.org/
2. Set the stylesheet in the Transformer.
           DocumentBuilderFactory factory =
            DocumentBuilderFactory.newInstance();
            DocumentBuilder builder = factory.newDocumentBuilder();
           Document document = builder.parse(new File("c:/input.xml"));
            TransformerFactory tFactory =
                TransformerFactory.newInstance();
            StreamSource stylesource = new StreamSource(stylesheet);//Set the Stylesheet
            Transformer transformer = tFactory.newTransformer(stylesource);
            DOMSource source = new DOMSource(document);
            StreamResult result = new StreamResult(System.out);
            transformer.transform(source, result);