如何使用Java获取XML节点值？

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

public class XMLParser {
    public static void main(String[] args) {
        try {
            // 创建DOM解析器工厂
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            // 创建DOM解析器
            DocumentBuilder builder = factory.newDocumentBuilder();
            // 加载XML文档
            Document document = builder.parse("path/to/your/xml/file.xml");
            
            // 获取根节点
            Node root = document.getDocumentElement();
            
            // 获取指定节点的值
            String nodeValue = getNodeValue(root, "nodeName");
            System.out.println("节点值：" + nodeValue);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    
    // 递归获取指定节点的值
    private static String getNodeValue(Node node, String nodeName) {
        if (node.getNodeName().equals(nodeName)) {
            return node.getTextContent();
        }
        
        NodeList childNodes = node.getChildNodes();
        for (int i = 0; i < childNodes.getLength(); i++) {
            Node childNode = childNodes.item(i);
            String value = getNodeValue(childNode, nodeName);
            if (value != null) {
                return value;
            }
        }
        
        return null;
    }
}

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpression;
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;

public class XMLParser {
    public static void main(String[] args) {
        try {
            // 创建DOM解析器工厂
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            // 创建DOM解析器
            DocumentBuilder builder = factory.newDocumentBuilder();
            // 加载XML文档
            Document document = builder.parse("path/to/your/xml/file.xml");
            
            // 创建XPath对象
            XPath xpath = XPathFactory.newInstance().newXPath();
            
            // 编译XPath表达式
            XPathExpression expression = xpath.compile("//nodeName");
            
            // 执行XPath表达式
            NodeList nodeList = (NodeList) expression.evaluate(document, XPathConstants.NODESET);
            
            // 获取节点值
            if (nodeList.getLength() > 0) {
                Node node = nodeList.item(0);
                String nodeValue = node.getTextContent();
                System.out.println("节点值：" + nodeValue);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}