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

public class UpdateXML {
    public static void main(String[] args) {
        try {
            File xmlFile = new File("data.xml");
            DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
            DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
            Document doc = dBuilder.parse(xmlFile);
            doc.getDocumentElement().normalize();

            // 修改第一个  节点的内容
            NodeList nodeList = doc.getElementsByTagName("name");
            if (nodeList.getLength() > 0) {
                Node node = nodeList.item(0);
                if (node.getNodeType() == Node.ELEMENT_NODE) {
                    Element element = (Element) node;
                    element.setTextContent("新名字");
                }
            }

            // 写回文件
            TransformerFactory transformerFactory = TransformerFactory.newInstance();
            Transformer transformer = transformerFactory.newTransformer();
            transformer.setOutputProperty(OutputKeys.INDENT, "yes");
            DOMSource source = new DOMSource(doc);
            StreamResult result = new StreamResult(xmlFile);
            transformer.transform(source, result);

            System.out.println("XML文件更新成功");

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