如何使特定的header元素出现在Java XML中

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

public class XMLHeaderExample {
    public static void main(String[] args) {
        try {
            // 创建XML文档对象
            DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
            DocumentBuilder docBuilder = docFactory.newDocumentBuilder();
            Document doc = docBuilder.newDocument();

            // 创建根元素
            Element rootElement = doc.createElement("root");
            doc.appendChild(rootElement);

            // 创建header元素
            Element headerElement = doc.createElement("header");
            rootElement.appendChild(headerElement);

            // 设置header元素的属性和值
            headerElement.setAttribute("name", "Sample Header");
            headerElement.setTextContent("Header Content");

            // 将XML文档写入文件或输出流
            // ...

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