Append data and save in XML

Question

hi all ! I have some data that is stored in a XML fine and since each SML is client based it can be edited according to everyone tastes. So my question is, can someone point me out how to append data and then saving it into the XML (hopefully without having to rewrite the whole XML document.
This is how Im retreiving my Data from the XML and my try at appending data, but I dont know if Im being succesfull because its not being saved:
String path = "C:/MedPro";
                File file = new File(path + "/XML/data.xml");
                DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
                DocumentBuilder db = dbf.newDocumentBuilder();
                Document doc = db.parse(file);
                doc.getDocumentElement().normalize();
                /* PARA ALIMENTAR LA AGENDA CON LOS DATOS DEL XML*/
                NodeList nodeLst = doc.getElementsByTagName("Agenda"); //Lista de Items para manejar la agenda
                for (int s = 0; s < nodeLst.getLength(); s++) {
                    Node fstNode = nodeLst.item(s);
                    if (fstNode.getNodeType() == Node.ELEMENT_NODE) {
                        Element fstElmnt = (Element) fstNode;
                        NodeList fstNmElmntLst = fstElmnt.getElementsByTagName("sub");
                        Element fstNmElmnt = (Element) fstNmElmntLst.item(0);
                        Node nod=fstNmElmntLst.item(0).appendChild(doc.createTextNode("Hola"));
                        /*NodeList fstNm = fstNmElmnt.getChildNodes();
                        System.out.println("Agenda : " + ((Node) fstNm.item(0)).getNodeValue());
                        lista_agenda.add(s, ((Node) fstNm.item(0)).getNodeValue());*/
                }Any help is appreciated.
Thanks a lot!
Edited by: juanmanuelsanchez on Oct 10, 2009 4:27 PM

Answer 1

juanmanuelsanchez wrote:
ok but is there a way to do it without having to rewrite the whole XML?short answer, no. xml, like many structured file formats, is not really amenable to "partial updating". the only way to "append" data to a file without rewriting it is to write to the end of the file. how will you maintain a valid xml format by only adding to the end of the file? i can't imagine the xml is that large seeing as you are using a DOM parser to read it, so i don't understand why you don't want to just rewrite the file.