// 1.通过DocumentBuilderFactor创建解析工厂

DocumentBuilderFactory builderFactory = DocumentBuilderFactory

.newInstance();

// 2.通过工厂获得解析器

DocumentBuilder builder = builderFactory.newDocumentBuilder();

// 3.通过parser方法获取Document

Document document = builder.parse("conf/books.xml");

// 4.获取xpath对象

XPath xpath = XPathFactory.newInstance().newXPath();

// 5.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

String exp = "/bookstore/book[@category='web'][2]/title/text()";

String tit = (String) xpath.evaluate(exp, document,

XPathConstants.STRING);

System.out.println(tit);

// 获取bookstore节点下book属性category值为web的titile属性为en的节点内容

String expEn = "/bookstore/book[@category='web']/title[@lang ='en']/text()";

String titEN = (String) xpath.evaluate(expEn, document,

XPathConstants.STRING);

System.out.println(titEN);

// 获取bookstore下book属性category值为cooking的title的lang属性的值

String expLan = "/bookstore/book[@category='cooking']/title/@lang";

String lang = (String) xpath.evaluate(expLan, document,

XPathConstants.STRING);

System.out.println(lang);