Java 语言的 XPath使用

http://www.ibm.com/developerworks/cn/xml/x-javaxpathapi.html

 

以及XPATH语法:

http://www.w3school.com.cn/xpath/xpath_syntax.asp

 

以下十个小例子：

import java.io.IOException;import org.w3c.dom.*;import org.xml.sax.SAXException;import javax.xml.parsers.*;import javax.xml.xpath.*;public class XPathExample {public static void main(String[] args) throws ParserConfigurationException,SAXException, IOException, XPathExpressionException {DocumentBuilderFactory domFactory = DocumentBuilderFactory.newInstance();domFactory.setNamespaceAware(true); // never forget this!DocumentBuilder builder = domFactory.newDocumentBuilder();Document doc = builder.parse("d:/book.xml");XPathFactory factory = XPathFactory.newInstance();XPath xpath = factory.newXPath();XPathExpression expr = xpath.compile("//book[author='Neal Stephenson']/title/text()");Object result = expr.evaluate(doc, XPathConstants.NODESET);NodeList nodes = (NodeList) result;for (int i = 0; i < nodes.getLength(); i++) {System.out.println(nodes.item(i).getNodeValue());}}}

 

以下是XML模板：

<?xml version="1.0" encoding="UTF-8"?><inventory> <book year="2000"> <title>Snow Crash</title> <author>Neal Stephenson</author> <publisher>Spectra</publisher> <isbn>0553380958</isbn> <price>14.95</price> </book> <book year="2005"> <title>Burning Tower</title> <author>Larry Niven</author> <publisher>Pocket</publisher> <isbn>0743416910</isbn> <price>5.99</price> </book> <book year="1995"> <title>Zodiac</title> <author>Neal Stephenson</author> <publisher>Spectra</publisher> <isbn>0553573862</isbn> <price>7.50</price> </book> </inventory>