如何通过XPath高效提取XML文档中的特定数据？

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本例展示了如何使用XPath提取XML文档数据。以下是大致的代码实现：

javaimport java.util.List;import org.dom4j.Document;import org.dom4j.Node;import org.dom4j.io.SAXReader;import org.junit.Test;

/** * 使用XPath提取XML文档数据 */public class XPathExample {

@Test public void extractData() throws Exception { SAXReader reader=new SAXReader(); Document document=reader.read(path/to/xml/file.xml); List nodes=document.selectNodes(//book/title);

for (Node node : nodes) { System.out.println(node.getText()); } }}

本文实例为大家分享了XPath提取xml文档数据具体代码，供大家参考，具体内容如下

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<? extends Node> 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<? extends Node> 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<? extends Node> 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<? extends Node> selectNodes = document.selectNodes("//book/name"); for (Node node : selectNodes) { if(node.valueOf("attribute::id").equals("1112")) { System.out.println(node.valueOf("attribute::sn")); } } } }

<dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.11</version> </dependency> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.17</version> </dependency> <dependency> <groupId>dom4j</groupId> <artifactId>dom4j</artifactId> </dependency> <dependency> <groupId>jaxen</groupId> <artifactId>jaxen</artifactId> <version>1.1.6</version> </dependency>

<?xml version="1.0" encoding="utf-8"?> <bookshelf> <book> <name id="1111" sn="sdd8">Tomorrow</name> <author>Hiskell</author> <price>$40</price> </book> <book> <name id="1112" sn="sdd9">Goodbye to You</name> <author>Giddle</author> <price>$25</price> </book> <book> <name id="1113" sn="sdd0">Sea and Old</name> <author>Heminw</author> <price>$28</price> </book> </bookshelf>

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