准备xml 文档
<?xml version="1.0" encoding="UTF-8"?> <bookstore> <book category="COOKING"> <title lang="en">Everyday Italian</title> <author>Giada De Laurentiis</author> <year>2005</year> <price>30.00</price> </book> <book category="CHILDREN"> <title lang="en">Harry Potter</title> <author>J K. Rowling</author> <year>2005</year> <price>29.99</price> </book> <book category="WEB"> <title lang="en">Learning XML</title> <author>Erik T. Ray</author> <year>2003</year> <price>39.95</price> </book> </bookstore>
创建测试类
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 XMLUtil { public static void main(String[] args) throws ParserConfigurationException,SAXException, IOException, XPathExpressionException { DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder(); Document document = builder.parse(new File("D:\workspace_j2ee\YN_XmlParse4.0_20180712\src\com\resources\DBConfig.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("==========================================================="); } }
获取测试结果
Learning XML =========================================================== en =========================================================== book =========================================================== COOKING CHILDREN WEB ===========================================================