JAXP/XPath example - III

30 June 2008

Do read the first 2 parts of this post before this one. So far, we have seen JAXP and DOM stuff.

Next step is to create an XPathFactory:

XPathFactory factory = XPathFactory.newInstance();

Now we have to use this factory to create an XPath object:

XPath xpath = factory.newXPath();

The XPath object compiles the XPath expression:

XPathExpression expr = xpath.compile("//book[author='Neal Stephenson']/title/text()");

Finally, we will evaluate the XPath expression to get the result using evaluate(…) method.

Object result = expr.evaluate(doc, XPathConstants.NODESET);

Noe you can cast the result to a DOM NodeList and iterate through that to find all the titles as shown below:

NodeList nodes = (NodeList) result;
for (int i = 0; i < nodes.getLength(); i++) {
    System.out.println(nodes.item(i).getNodeValue()); 
}

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