只从java的XML文档中获取txt？

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

public class XMLParser {
    public static void main(String[] args) {
        try {
            // 加载XML文档
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            DocumentBuilder builder = factory.newDocumentBuilder();
            Document document = builder.parse(new File("input.xml"));

            // 定位目标节点
            NodeList nodeList = document.getElementsByTagName("txt");

            // 提取txt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 txt = element.getTextContent();
                    System.out.println("txt: " + txt);
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}