import java.io.IOException;

import java.io.InputStream;

import javax.xml.parsers.DocumentBuilder;

import javax.xml.parsers.DocumentBuilderFactory;

import javax.xml.parsers.ParserConfigurationException;

import javax.xml.xpath.XPath;

import javax.xml.xpath.XPathConstants;

import javax.xml.xpath.XPathExpression;

import javax.xml.xpath.XPathExpressionException;

import javax.xml.xpath.XPathFactory;

import org.w3c.dom.Document;

import org.w3c.dom.NodeList;

import org.xml.sax.SAXException;

/**

*

* 普通DOM与XPath

* @author licheng

*

*/

public class TestXPath {

public static void main(String[] args) {

read();

}

public static void read() {

try {

DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();

DocumentBuilder builder = dbf.newDocumentBuilder();

InputStream in = TestXPath.class.getClassLoader().getResourceAsStream("university.xml");

Document doc = builder.parse(in);

XPathFactory factory = XPathFactory.newInstance();

XPath xpath = factory.newXPath();

// 选取所有class元素的name属性

// XPath语法介绍： http://w3school.com.cn/xpath/

XPathExpression expr = xpath.compile("//class/@name");

NodeList nodes = (NodeList) expr.evaluate(doc, XPathConstants.NODESET);

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

System.out.println("name = " + nodes.item(i).getNodeValue());

}

} catch (XPathExpressionException e) {

e.printStackTrace();

} catch (ParserConfigurationException e) {

e.printStackTrace();

} catch (SAXException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

}

}