xml怎么提取节点_xml如何提取节点

Java (使用 JAXB 或 XPath)

JAXB（Java Architecture for XML Binding）可以将 XML 转换成 Java 对象。XPath 则是一种查询语言，用于在 XML 文档中定位节点。

import javax.xml.parsers.DocumentBuilderFactory;import javax.xml.parsers.DocumentBuilder;import org.w3c.dom.Document;import org.w3c.dom.NodeList;import org.w3c.dom.Element;import javax.xml.xpath.*;import java.io.StringReader;public class XMLParser {    public static void main(String[] args) throws Exception {        String xmlString = "Giada De Laurentiis200530.00J.K. Rowling200529.99";        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();        DocumentBuilder builder = factory.newDocumentBuilder();        Document doc = builder.parse(new org.xml.sax.InputSource(new StringReader(xmlString)));        XPathFactory xPathfactory = XPathFactory.newInstance();        XPath xpath = xPathfactory.newXPath();        // 提取所有 book 元素的 title        XPathExpression expr = xpath.compile("//book/title/text()");        NodeList nodes = (NodeList) expr.evaluate(doc, XPathConstants.NODESET);        System.out.println("Titles:");        for (int i = 0; i < nodes.getLength(); i++) {            System.out.println(nodes.item(i).getNodeValue());        }        // 提取 category 为 COOKING 的 book 元素的 title        expr = xpath.compile("//book[@category='COOKING']/title/text()");        nodes = (NodeList) expr.evaluate(doc, XPathConstants.NODESET);        System.out.println("Cooking Titles:");        for (int i = 0; i < nodes.getLength(); i++) {            System.out.println(nodes.item(i).getNodeValue());        }        // 提取 title 元素的 lang 属性        expr = xpath.compile("//title/@lang");        nodes = (NodeList) expr.evaluate(doc, XPathConstants.NODESET);        System.out.println("Lang Attributes:");        for (int i = 0; i < nodes.getLength(); i++) {            System.out.println(nodes.item(i).getNodeValue());        }    }}

const xmlString = `Giada De Laurentiis200530.00J.K. Rowling200529.99`;const parser = new DOMParser();const xmlDoc = parser.parseFromString(xmlString, "text/xml");// 提取所有 book 元素的 titleconst titles = Array.from(xmlDoc.querySelectorAll("book > title")).map(title => title.textContent);console.log("Titles:", titles);// 提取 category 为 COOKING 的 book 元素的 titleconst cookingTitles = Array.from(xmlDoc.querySelectorAll("book[category='COOKING'] > title")).map(title => title.textContent);console.log("Cooking Titles:", cookingTitles);// 提取 title 元素的 lang 属性const langAttributes = Array.from(xmlDoc.querySelectorAll("title")).map(title => title.getAttribute("lang"));console.log("Lang Attributes:", langAttributes);