将元素添加到java中的xml文件，而无需将其加载到内存中。

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.XMLWriter;

import java.io.FileWriter;
import java.io.IOException;

public class AddElementToXML {
    public static void main(String[] args) {
        try {
            // 读取XML文件
            Document document = DocumentHelper.parse("path/to/your/xml/file.xml");

            // 获取根元素
            Element root = document.getRootElement();

            // 创建新元素
            Element newElement = root.addElement("newElement");
            newElement.setText("This is a new element");

            // 写入XML文件
            OutputFormat format = OutputFormat.createPrettyPrint();
            XMLWriter writer = new XMLWriter(new FileWriter("path/to/your/xml/file.xml"), format);
            writer.write(document);
            writer.close();

            System.out.println("Element added successfully.");
        } catch (DocumentException | IOException e) {
            e.printStackTrace();
        }
    }
}