How to convert DOM Tree in XML File

Question

Hi there,
I am successful to build a DOM tree in memory where i am adding elements. Now after all this i want to make a XML file of that DOM representation. Now, i am confused with my code that how to transfer DOM structure to xml file ? A small code is attached herewith ?
doc = db.newDocument();
               doc.normalizeDocument();
               doc.setXmlVersion("1.0");
               doc.createComment("Created By: Sachin Kulkarni");
               Element rn = doc.createElement("RootNode");
               Element n1 = doc.createElement("A1");
               ((Node)n1).setNodeValue("Element A1");
               Element n11 = doc.createElement("A11");
               ((Node)n11).setNodeValue("Element A11");
               Element n12 = doc.createElement("A12");
               ((Node)n12).setNodeValue("Element A12");
               ((Node)n1).appendChild( ((Node)n11) );
               ((Node)n1).appendChild( ((Node)n12) );
               Element n2 = doc.createElement("A2");
               ((Node)n2).setNodeValue("Element A2");
               Element n3 = doc.createElement("A3");
               ((Node)n3).setNodeValue("Element A3");
               ((Node)rn).appendChild( ((Node)n1) );
               ((Node)rn).appendChild( ((Node)n2) );
               ((Node)rn).appendChild( ((Node)n3) );
//creating the xml file
               Source source = new DOMSource((Element) doc.getElementsByTagName("RootNode").item(0));
               StringWriter out = new StringWriter();
               StreamResult result = new StreamResult(out);
               Transformer transformer = TransformerFactory.newInstance().newTransformer();
               transformer.setOutputProperty("encoding", "iso-8859-1");
               transformer.setOutputProperty("indent", "yes");
               //transformer.setOutputProperty("test.xml","1");
               //transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4");
               transformer.transform(source,result);
               result.getWriter().toString();
==================
Is it any problem with the implementation ? How to use fileoutputstream with this ?

Answer 1

I have done like this:
DocumentBuilderFactory docBuildFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = docBuildFactory.newDocumentBuilder();
Document doc = builder.newDocument();
Element root = (Element)doc.createElement("Root");
doc.appendChild(root);
Element address = (Element)doc.createElement("Address");
address.appendChild((Element)doc.createElement("Street"));
address.appendChild((Element)doc.createElement("PostCode"));
address.appendChild((Element)doc.createElement("Town"));
Element country = (Element)doc.createElement("Country");
country.setAttribute("type","EU");
Text cname = doc.createTextNode("Spain");
country.appendChild(cname);
address.appendChild(country);
root.appendChild(address);
TransformerFactory tranFactory = TransformerFactory.newInstance();
Transformer aTransformer = tranFactory.newTransformer();
aTransformer.setOutputProperty(OutputKeys.INDENT, "yes");
Source src = new DOMSource(doc);
Result dest = new StreamResult(new FileOutputStream(new File("test.xml")));
aTransformer.transform(src, dest);