如何使用XPath提取xml文档数据

 import java.util.List; import org.dom4j.Document; import org.dom4j.Node; import org.dom4j.io.SAXReader; import org.junit.Test; /* * 使用XPath查找xml文档数据 * */ public class DemoXPath { @Test //输出book.xml中所有price元素节点的文本值 public void test1() throws Exception { SAXReader reader = new SAXReader(); Document document = reader.read("src/main/java/book.xml"); List selectNodes = document.selectNodes("//price"); for(Node node : selectNodes) { String text = node.getText(); System.out.println(text); } } @Test //输出book.xml中第二本书的price元素节点的文本值 public void test2() throws Exception { SAXReader reader = new SAXReader(); Document document = reader.read("src/main/java/book.xml"); Node selectSingleNode = document.selectSingleNode("/bookshelf/book[2]/price"); String text = selectSingleNode.getText(); System.out.println(text); } @Test //输出book.xml中第二本书和第三本书的author元素节点的文本值 public void test3() throws Exception { SAXReader reader = new SAXReader(); Document document = reader.read("src/main/java/book.xml"); List selectSingleNode = document.selectNodes("/bookshelf/book[position()>1]/author"); for (Node node : selectSingleNode) { String text = node.getText(); System.out.println(text); } } @Test //输出book.xml中含有属性id的所有name的文本值 public void test4() throws Exception { SAXReader reader = new SAXReader(); Document document = reader.read("src/main/java/book.xml"); List selectSingleNode = document.selectNodes("//name[@id]"); for (Node node : selectSingleNode) { String text = node.getText(); System.out.println(text); } } @Test //输出book.xml中含有属性id="1111"的name的文本值 public void test5() throws Exception { SAXReader reader = new SAXReader(); Document document = reader.read("src/main/java/book.xml"); Node selectSingleNode = document.selectSingleNode("//name[@id=\"1111\"]"); String text = selectSingleNode.getText(); System.out.println(text); } @Test //输出book.xml中含有属性id="1112"的book的author的文本值 public void test6() throws Exception { SAXReader reader = new SAXReader(); Document document = reader.read("src/main/java/book.xml"); Node selectSingleNode = document.selectSingleNode("//book[name[@id=\"1112\"]]/author"); String text = selectSingleNode.getText(); System.out.println(text); } @Test //输出book.xml中第一本book的id的属性值 public void test7() throws Exception { SAXReader reader = new SAXReader(); Document document = reader.read("src/main/java/book.xml"); Node selectSingleNode = document.selectSingleNode("//book[1]/name"); String text = selectSingleNode.valueOf("attribute::id");//获取id属性 System.out.println(text); } @Test //输出book.xml中book的name的id的属性值为1112的对应的sn的属性值 public void test8() throws Exception { SAXReader reader = new SAXReader(); Document document = reader.read("src/main/java/book.xml"); List selectNodes = document.selectNodes("//book/name"); for (Node node : selectNodes) { if(node.valueOf("attribute::id").equals("1112")) { System.out.println(node.valueOf("attribute::sn")); } } } }

  junit junit 4.11   log4j log4j 1.2.17   dom4j dom4j   jaxen jaxen 1.1.6 

    TomorrowHiskell$40 Goodbye to YouGiddle$25 Sea and OldHeminw$28