Tag Archives: xml

Java

XPath Query Not Returning any Results in Java

Leave a comment

In looking over documentation on XPath queries it seemed easy enough to be able to pull out values from XML, but try as I might I kept getting no results back. Even searching on the root element “/elementName” didn’t return any results. Of course, as with all things Java there’s a trick and that trick is to call setNamespaceAware(). Here’s a quick and dirty example…


DocumentBuilderFactory domFactory = DocumentBuilderFactory.newInstance();
domFactory.setNamespaceAware(false); // NEVER FORGET THIS
DocumentBuilder builder = domFactory.newDocumentBuilder();
XPathFactory factory = XPathFactory.newInstance();
XPath xpath = factory.newXPath();
XPathExpression expr = xpath.compile("/items/item[@id='2']");
return (NodeList)expr.evaluate(domDocument, XPathConstants.NODESET);
Please remember to subscribe to the newsletter to stay up to date!

You or someone you know looking to buy or sell?
Disclaimer: Thoughts and opinions are my own, and do not reflect the views of any employer, family member, friend, or anyone else. Some links may be affiliate links, but I don't link to anything I don't use myself. You would think this should be self evident these days, but apparently not...
Java

Output a DOM Document as XML using Java

Leave a comment

Ok, here’s another nerdy post for all the java developers out there.  Hopefully it saves you some time.

Let’s say you have a XML DOM Document that you’ve been modifying in your code, and now want to write it back out as XML.  One would think there would be a nice toXml() method or something on the Document, but there isn’t.  Instead, make sure you have the xalan.jar file on your class path and use this function…


public static String getDomDocumentAsXml(org.w3c.dom.Document domDocument)
{
	try
	{
		TransformerFactory tf = TransformerFactory.newInstance();
		Transformer transformer = tf.newTransformer();
		transformer.setOutputProperty(OutputKeys.INDENT, "yes");
		StreamResult xmlOutput = new StreamResult(new StringWriter());
		transformer.transform(new DOMSource(domDocument), xmlOutput);
		return xmlOutput.getWriter().toString();
	}
	catch (Exception e) { e.printStackTrace(); return null; }
}
Please remember to subscribe to the newsletter to stay up to date!

You or someone you know looking to buy or sell?
Disclaimer: Thoughts and opinions are my own, and do not reflect the views of any employer, family member, friend, or anyone else. Some links may be affiliate links, but I don't link to anything I don't use myself. You would think this should be self evident these days, but apparently not...