如何从我的java控制台输出文件中获取特定的xml标记？

import org.w3c.dom.*;
import javax.xml.parsers.*;
import java.io.*;

public class XMLParser {
    public static void main(String[] args) {
        try {
            // 读取文件
            File file = new File("file.xml");
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            DocumentBuilder builder = factory.newDocumentBuilder();
            Document document = builder.parse(file);

            // 定位特定标记
            NodeList nodeList = document.getElementsByTagName("特定标记");

            // 提取标记内容
            for (int i = 0; i < nodeList.getLength(); i++) {
                Node node = nodeList.item(i);
                if (node.getNodeType() == Node.ELEMENT_NODE) {
                    Element element = (Element) node;
                    String content = element.getTextContent();
                    System.out.println("特定标记内容：" + content);
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}