SAX parsing is for reading documents, not writing them.
You can write XML with the XMLStreamWriter:
OutputStream outputStream = new FileOutputStream(new File("doc.xml"));
XMLStreamWriter out = XMLOutputFactory.newInstance().createXMLStreamWriter(
new OutputStreamWriter(outputStream, "utf-8"));
out.writeStartDocument();
out.writeStartElement("doc");
out.writeStartElement("title");
out.writeCharacters("Document Title");
out.writeEndElement();
out.writeEndElement();
out.writeEndDocument();
out.close();