package com.hongyuan.test;import java.io.File;import java.io.IOException;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.XPathexpressionException;import javax.xml.xpath.XPathFactory;import org.w3c.dom.document;import org.w3c.dom.Node;import org.w3c.dom.NodeList;import org.xml.sax.SAXException;public class XPathTest { public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException, XPathexpressionException { // 解析文件，生成document对象 documentBuilder builder = documentBuilderFactory.newInstance() .newdocumentBuilder(); document document = builder.parse(new File("bookstore.xml")); // 生成XPath对象 XPath xpath = XPathFactory.newInstance().newXPath(); // 获取节点值 String webTitle = (String) xpath.evaluate( "/bookstore/book[@category='WEB']/title/text()", document, XPathConstants.STRING); System.out.println(webTitle); System.out.println("==========================================================="); // 获取节点属性值 String webTitleLang = (String) xpath.evaluate( "/bookstore/book[@category='WEB']/title/@lang", document, XPathConstants.STRING); System.out.println(webTitleLang); System.out.println("==========================================================="); // 获取节点对象 Node bookWeb = (Node) xpath.evaluate( "/bookstore/book[@category='WEB']", document, XPathConstants.NODE); System.out.println(bookWeb.getNodeName()); System.out.println("==========================================================="); // 获取节点集合 NodeList books = (NodeList) xpath.evaluate("/bookstore/book", document, XPathConstants.NODESET); for (int i = 0; i < books.getLength(); i++) { Node book = books.item(i); System.out.println(xpath.evaluate("@category", book, XPathConstants.STRING)); } System.out.println("==========================================================="); }}bookstore.xml
Everyday Italian Giada De Laurentiis 2005 30.00 Harry Potter J K. Rowling 2005 29.99 Learning XML Erik T. Ray 2003 39.95
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