XML/XPath: Difference between revisions

=={{header|Java}}==

<lang java>import java.io.StringReader;

import javax.xml.parsers.DocumentBuilderFactory;

import javax.xml.xpath.XPath;

import javax.xml.xpath.XPathConstants;

import javax.xml.xpath.XPathFactory;

import org.w3c.dom.Document;

import org.w3c.dom.Node;

import org.w3c.dom.NodeList;

import org.xml.sax.InputSource;

public class XMLParser {

final static String xmlStr =

"<inventory title=\"OmniCorp Store #45x10^3\">"

+ " <section name=\"health\">"

+ " <item upc=\"123456789\" stock=\"12\">"

+ " <name>Invisibility Cream</name>"

+ " <price>14.50</price>"

+ " <description>Makes you invisible</description>"

+ " </item>"

+ " <item upc=\"445322344\" stock=\"18\">"

+ " <name>Levitation Salve</name>"

+ " <price>23.99</price>"

+ " <description>Levitate yourself for up to 3 hours per application</description>"

+ " </item>"

+ " </section>"

+ " <section name=\"food\">"

+ " <item upc=\"485672034\" stock=\"653\">"

+ " <name>Blork and Freen Instameal</name>"

+ " <price>4.95</price>"

+ " <description>A tasty meal in a tablet; just add water</description>"

+ " </item>"

+ " <item upc=\"132957764\" stock=\"44\">"

+ " <name>Grob winglets</name>"

+ " <price>3.56</price>"

+ " <description>Tender winglets of Grob. Just add priwater</description>"

+ " </item>"

+ " </section>"

+ "</inventory>";

public static void main(String[] args) {

try {

Document doc = DocumentBuilderFactory.newInstance()

.newDocumentBuilder()

.parse(new InputSource(new StringReader(xmlStr)));

XPath xpath = XPathFactory.newInstance().newXPath();

// 1

System.out.println(((Node) xpath.evaluate(

"/inventory/section/item[1]", doc, XPathConstants.NODE))

.getAttributes().getNamedItem("upc"));

// 2, 3

NodeList nodes = (NodeList) xpath.evaluate(

"/inventory/section/item/price", doc,

XPathConstants.NODESET);

for (int i = 0; i < nodes.getLength(); i++)

System.out.println(nodes.item(i).getTextContent());

} catch (Exception e) {

System.out.println("Error ocurred while parsing XML.");

}

}

}</lang>