Parse XML using DOM file and run XPath query

Tue Oct 23, 2012 11:27 pm

Parse XML using DOM file and run XPath query.

Code:: import org.w3c.dom.*; import javax.xml.xpath.*; import javax.xml.parsers.*; import java.io.IOException; import org.xml.sax.SAXException; public class XpathWork { public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException, XPathExpressionException { // Reading xml file using DOM DocumentBuilderFactory domFactory = DocumentBuilderFactory.newInstance(); domFactory.setNamespaceAware(true); DocumentBuilder builder = domFactory.newDocumentBuilder(); Document docment = builder.parse("file.xml"); XPath xpathObject = XPathFactory.newInstance().newXPath(); // Run the query XPathExpression xpathExpression = xpathObject.compile("//*[count(Info)=3]"); //Select elements which have three children Info System.out.println("Getting elements which have three sub nodes of type Info"); Object result = xpathExpression.evaluate(docment, XPathConstants.NODESET); NodeList allNodes = (NodeList) result; for (int i = 0; i < allNodes.getLength(); i++) { System.out.println(allNodes.item(i).getNodeName()); } System.out.println("Getting elements which have 3 sub nodes"); xpathExpression = xpathObject.compile("//*[count(*)=3]"); //Select elements which have any three children Info result = xpathExpression.evaluate(docment, XPathConstants.NODESET); allNodes = (NodeList) result; for (int i = 0; i < allNodes.getLength(); i++) { System.out.println("Node name = " + allNodes.item(i).getNodeName()); } } }

XML file:

Code:: <?xml version="1.0" ?> <Student> <Name> <Info/> <Info/> <Info/> </Name> <Age> <Info/> <Info/> </Age> <Address> <Info/> <Info/> </Address> </Student>