000_动力节点_XML_源码.rar_DOM4J_dom4j xml

package com.bjpowernode.xml; 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.XPathFactory; import org.w3c.dom.Document; import org.w3c.dom.Element; import org.w3c.dom.NodeList; public class MyXPathTest { /** * @param args */ public static void main(String[] args) { try { //创建解析工厂 DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance(); //创建解析器 DocumentBuilder builder = documentBuilderFactory.newDocumentBuilder(); //通过解析器读取配置文件,生成一个Document[org.w3c.dom]对象树 Document document = builder.parse("conf/bookstore.xml"); //创建XPath对象 XPath xPath = XPathFactory.newInstance().newXPath(); // 1.获取bookstore节点下book属性category值为web下的第二个title节点的文本内容 // bookstore -> book[@category='web'][2] -> title // xpath路径：/bookstore/book[@category='web'][2]/title/text() String titleXpath = "/bookstore/book[@category='web'][2]/title/text()"; String titleValue = (String) xPath.evaluate(titleXpath, document, XPathConstants.STRING); System.out.println(titleValue); // 2.获取bookstore节点下book属性category值为web的titile属性为en的节点内容 // bookstore -> book[@category='web'] -> title[@lang='en'] // xpath路径：/bookstore/book[@category='web']/title[@lang='en']/text() String titleLangXpath = "/bookstore/book[@category='web']/title[@lang='en']/text()"; String titleLangValue = (String) xPath.evaluate(titleLangXpath, document, XPathConstants.STRING); System.out.println(titleLangValue); // 3.获取bookstore下book属性category值为cooking的title的lang属性的值 // bookstore -> book[@category='cooking'] -> title ->@lang // xpath路径：/bookstore/book[@category='cooking']/title/@lang String titleLangAttrXpath = "/bookstore/book[@category='cooking']/title/@lang"; String titleLangAttrValue = (String) xPath.evaluate(titleLangAttrXpath, document, XPathConstants.STRING); System.out.println(titleLangAttrValue); // 4.获取bookstore节点下所有book的节点集合 // /bookstore/book NodeList bookList = (NodeList) xPath.evaluate("/bookstore/book", document, XPathConstants.NODESET); //开始遍历bookList for(int i = 0; i < bookList.getLength(); i++){ Element bookElt = (Element) bookList.item(i); String titleValue01 = (String) xPath.evaluate("title", bookElt, XPathConstants.STRING); String authorValue = (String) xPath.evaluate("author", bookElt, XPathConstants.STRING); String year = (String) xPath.evaluate("year", bookElt, XPathConstants.STRING); String price = (String) xPath.evaluate("price", bookElt, XPathConstants.STRING); System.out.println(titleValue01 + " " + authorValue + " " + year + " " + price); System.out.println("---------------"); } } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } }