如何更新XML节点？

import xml.etree.ElementTree as ET

# 解析XML字符串
xml_string = '<root><node1>value1</node1><node2>value2</node2></root>'
root = ET.fromstring(xml_string)

# 更新节点值
node1 = root.find('node1')
node1.text = 'new_value1'

# 将更新后的XML写入字符串
updated_xml_string = ET.tostring(root, encoding='utf8', method='xml').decode('utf8')
print(updated_xml_string)

const xmlString = '<root><node1>value1</node1><node2>value2</node2></root>';

// 解析XML字符串
const parser = new DOMParser();
const xmlDoc = parser.parseFromString(xmlString, 'application/xml');

// 更新节点值
const node1 = xmlDoc.getElementsByTagName('node1')[0];
node1.textContent = 'new_value1';

// 将更新后的XML写入字符串
const updatedXmlString = new XMLSerializer().serializeToString(xmlDoc);
console.log(updatedXmlString);

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;

public class UpdateXMLNode {
    public static void main(String[] args) {
        String xmlString = "<root><node1>value1</node1><node2>value2</node2></root>";

        try {
            // 解析XML字符串
            DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
            DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
            InputSource is = new InputSource(new StringReader(xmlString));
            Document doc = dBuilder.parse(is);

            // 更新节点值
            NodeList node1List = doc.getElementsByTagName("node1");
            Element node1 = (Element) node1List.item(0);
            node1.setTextContent("new_value1");

            // 将更新后的XML写入字符串
            TransformerFactory transformerFactory = TransformerFactory.newInstance();
            Transformer transformer = transformerFactory.newTransformer();
            transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
            StringWriter writer = new StringWriter();
            transformer.transform(new DOMSource(doc), new StreamResult(writer));
            String updatedXmlString = writer.getBuffer().toString().trim();
            System.out.println(updatedXmlString);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}