如何使用Java合并多个xml文件 将多个文档结构合并为一个

import org.w3c.dom.*;
import javax.xml.parsers.*;
import javax.xml.transform.*;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import java.io.File;
import java.util.Arrays;

public class MergeXMLFiles {

    public static void main(String[] args) {
        try {
            // 创建文档构建器
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            DocumentBuilder builder = factory.newDocumentBuilder();

            // 创建目标文档（合并后的文档）
            Document targetDoc = builder.newDocument();
            Element rootElement = targetDoc.createElement("mergedRoot");
            targetDoc.appendChild(rootElement);

            // 要合并的XML文件列表
            String[] filePaths = {"file1.xml", "file2.xml", "file3.xml"};

            for (String filePath : Arrays.asList(filePaths)) {
                File xmlFile = new File(filePath);
                if (!xmlFile.exists()) {
                    System.out.println("文件不存在: " + filePath);
                    continue;
                }

                // 解析源文件
                Document sourceDoc = builder.parse(xmlFile);
                sourceDoc.getDocumentElement().normalize();

                // 获取源文档的所有子节点
                NodeList children = sourceDoc.getDocumentElement().getChildNodes();
                for (int i = 0; i < children.getLength(); i++) {
                    Node node = children.item(i);
                    // 只复制元素节点
                    if (node.getNodeType() == Node.ELEMENT_NODE) {
                        Node importedNode = targetDoc.importNode(node, true); // 深拷贝
                        rootElement.appendChild(importedNode);
                    }
                }
            }

            // 将合并后的文档写入输出文件
            TransformerFactory transformerFactory = TransformerFactory.newInstance();
            Transformer transformer = transformerFactory.newTransformer();
            transformer.setOutputProperty(OutputKeys.INDENT, "yes");
            DOMSource source = new DOMSource(targetDoc);
            StreamResult result = new StreamResult(new File("merged_output.xml"));
            transformer.transform(source, result);

            System.out.println("XML文件合并完成，输出文件：merged_output.xml");

        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}