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XPath即为XML路径语言(XML Path Language),它是一种用来确定XML文档中某部分位置的语言。XPath基于XML的树状结构,提供在数据结构树中找寻节点的能力。起初 XPath 的提出的初衷是将其作为一个通用的、介于XPointer与XSL间的语法模型。但是 XPath 很快的被开发者采用来当作小型查询语言
XPathTest.java
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
<?xml version="1.0" encoding="utf-8" ?> <bookstore> <book category="COOKING"> <title>Everyday Italian</title> <author>Giada De Laurentiis</author> <year>2005</year> <price>30.00</price> </book> <book category="CHILDREN"> <title>Harry Potter</title> <author>J K. Rowling</author> <year>2005</year> <price>29.99</price> </book> <book category="WEB"> <title>Learning XML</title> <author>Erik T. Ray</author> <year>2003</year> <price>39.95</price> </book> </bookstore>
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