如何以编程方式向现有XML配置添加新的记录器和附加器

import org.w3c.dom.*;
import javax.xml.parsers.*;
import javax.xml.transform.*;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

public class XMLConfigUpdater {
    public static void main(String[] args) {
        try {
            // 1. 解析现有的XML配置文件
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            DocumentBuilder builder = factory.newDocumentBuilder();
            Document document = builder.parse("existing_config.xml");

            // 2. 创建新的记录器和附加器对象
            Element newLogger = document.createElement("logger");
            newLogger.setAttribute("name", "NewLogger");
            Element newAppender = document.createElement("appender");
            newAppender.setAttribute("name", "NewAppender");

            // 3. 设置记录器和附加器属性
            // ...

            // 4. 将新的记录器和附加器对象添加到现有配置中
            Element loggers = (Element) document.getElementsByTagName("loggers").item(0);
            loggers.appendChild(newLogger);

            Element appenders = (Element) document.getElementsByTagName("appenders").item(0);
            appenders.appendChild(newAppender);

            // 5. 保存更新后的XML配置
            TransformerFactory transformerFactory = TransformerFactory.newInstance();
            Transformer transformer = transformerFactory.newTransformer();
            DOMSource source = new DOMSource(document);
            StreamResult result = new StreamResult(new File("updated_config.xml"));
            transformer.transform(source, result);

            System.out.println("XML configuration updated successfully.");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}