Looking for a Generic_node-to-string utility

Question

Hello
I'm creating a "SurveyEngine" application that will use a XML document defining the questions and storing the answers of the users. There is part of my webApp that must:
1-parse the XML file (i am ok till there)
2-append a XML child node (.. it should not be too hard, but if you have sample codes, please send)
3-translate the modified document object back to a string to overwrite the file
I need help mostly for the 3th step. I looked in the java API in the packages dom, sax, etc... and I didnt find anything. Could someone tell me which package.class I must use? If you know that such a class does not exist in the java API, but that you already defined a class to handle generic_node-to-string translation, I would be very grateful if you could send me your sources.
Thanks in advance,
Alexandre Bouchard

Answer 1

ok here is the parsing section of my code:
         DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            //basic response configurations
          response.setContentType("text/html");
          out = response.getWriter(); 
         try
            //create the DOM parser and parse the XML docs
            DocumentBuilder builder = factory.newDocumentBuilder();
            Document document = builder.parse( new File("documents.xml") );
            ...here there will be modifications done to document
            ... and here, I want to ouput the modified document to the screen or to a file or whatever...                                                      
        catch (SAXException sxe)
        { // Error generated during parsing)
                Exception x = sxe;
                if (sxe.getException() != null)
                        x = sxe.getException();
                x.printStackTrace();
                out.println( "SAX Exception: " + sxe );
        catch (ParserConfigurationException pce)
        { // Parser with specified options can't be built
                pce.printStackTrace();
                out.println( "ParserConfigurationException: " + pce );
        catch (IOException ioe)
        { // I/O error
                ioe.printStackTrace();
                out.println( "io Exception: " + ioe );
        }All I want is a kind of document.toString() that really transform the document to a string. If you could write me some codes that do that using XMLSerializer, I would be very grateful.
I know that it wouldnt be too hard to write my own XMLToString() utility, but it would violate my First Law of Programming: Never reinvent the wheel.
Thanks a lot for your attention lk555