如何更改xml文件中元素的值？

import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import java.io.File;

public class XMLModifier {
    public static void main(String[] args) {
        try {
            // 加载XML文件
            File xmlFile = new File("path/to/your/xml/file.xml");
            DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
            DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
            Document doc = dBuilder.parse(xmlFile);

            // 定位要更改的元素
            NodeList nodeList = doc.getElementsByTagName("elementName");
            Element element = (Element) nodeList.item(0);

            // 修改元素的值
            element.setTextContent("new value");

            // 保存修改后的XML文件
            // ...

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