Transform DOM XML document ไปเป็น file ด้วย

javax.xml.transform.dom
javax.xml.transform.sax
javax.xml.transform.stream

import javax.xml.parsers.*;
import javax.xml.transform.*;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

      TransformerFactory xformFactory
     = TransformerFactory.newInstance();
    Transformer idTransform = xformFactory.newTransformer();
    Source input = new DOMSource(doc);
    Result output = new StreamResult(System.out);
    idTransform.transform(input, output);