Java easy XML

gistfile1.java

//My notes on doing XML stuff in Java, as simply as possible
//not production quality, obviously

//XML parsing
DocumentBuilder db = null;
try {
	db = DocumentBuilderFactory.newInstance().newDocumentBuilder();
} catch (ParserConfigurationException e) {
}

Document dom = null;
try {
	dom = db.parse(new ByteArrayInputStream(xmlString.getBytes(StandardCharsets.UTF_8)));
	dom.setXmlStandalone(true); //else we get the standalone="no" attribute in the XML declaration
} catch (SAXException e) {
} catch (IOException e) {
}

//XML printing
try {
	Transformer t = TransformerFactory.newInstance().newTransformer();
	StringWriter sw = new StringWriter();
	t.transform(new DOMSource(node), new StreamResult(sw));
	return sw.getBuffer().toString();
} catch (TransformerConfigurationException e) {
} catch (TransformerFactoryConfigurationError e) {
} catch (TransformerException e) {
}

//Node querying and manipulation with XPath
try {
	XPath xp = XPathFactory.newInstance().newXPath();
	//directly from String
	String s = xp.compile("/root/auth/login/text()").evaluate(new InputSource(new ByteArrayInputStream(xmlString.getBytes(StandardCharsets.UTF_8))));
	//from a parsed DOM (Document class)
	Node n = (Node) xp.compile("/root/auth/login/text()").evaluate(dom, XPathConstants.NODE);
	n.setNodeValue("username");
} catch (XPathExpressionException e) {
}