如何使用Java编程将xml记录从一个xml文件复制到另一个文件？

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

public class XMLCopy {
    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();

            // 加载要读取的XML文件
            File inputFile = new File("input.xml");
            FileInputStream inputStream = new FileInputStream(inputFile);
            Document inputDoc = builder.parse(inputStream);

            // 获取XML根节点
            Element root = inputDoc.getDocumentElement();

            // 创建要写入的XML文件
            File outputFile = new File("output.xml");
            FileOutputStream outputStream = new FileOutputStream(outputFile);

            // 复制根节点和子节点到输出文件
            copyNode(root, outputStream);

            // 关闭输入输出流
            inputStream.close();
            outputStream.close();

            System.out.println("XML记录已成功复制到另一个文件！");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private static void copyNode(Node node, FileOutputStream outputStream) throws Exception {
        // 创建DOM文档
        Document outputDoc = DocumentBuilderFactory.newInstance().newDocumentBuilder().newDocument();
        // 克隆节点
        Node copiedNode = outputDoc.importNode(node, true);
        // 添加节点到输出文档
        outputDoc.appendChild(copiedNode);
        // 将输出文档写入文件
        javax.xml.transform.Transformer transformer =
                javax.xml.transform.TransformerFactory.newInstance().newTransformer();
        transformer.setOutputProperty(javax.xml.transform.OutputKeys.INDENT, "yes");
        transformer.transform(
                new javax.xml.transform.dom.DOMSource(outputDoc),
                new javax.xml.transform.stream.StreamResult(outputStream)
        );

        // 递归复制子节点
        NodeList childNodes = node.getChildNodes();
        for (int i = 0; i < childNodes.getLength(); i++) {
            Node childNode = childNodes.item(i);
            copyNode(childNode, outputStream);
        }
    }
}