如何在xml节点内获取属性

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

public class XMLParser {
    public static void main(String[] args) {
        try {
            // 创建一个DocumentBuilderFactory对象
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            
            // 创建一个DocumentBuilder对象
            DocumentBuilder builder = factory.newDocumentBuilder();
            
            // 加载XML文档
            Document document = builder.parse("example.xml");
            
            // 获取根节点
            Element root = document.getDocumentElement();
            
            // 获取目标节点
            NodeList nodeList = root.getElementsByTagName("book");
            
            // 遍历目标节点
            for (int i = 0; i < nodeList.getLength(); i++) {
                Element book = (Element) nodeList.item(i);
                
                // 获取属性值
                String id = book.getAttribute("id");
                String title = book.getAttribute("title");
                
                // 打印属性值
                System.out.println("Book ID: " + id);
                System.out.println("Book Title: " + title);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}