xml怎么保存

import xml.etree.ElementTree as ET

# 创建一个 XML 元素树
tree = ET.ElementTree()

# 添加根元素
root = ET.Element('root')
tree.setroot(root)

# 添加子元素
child = ET.Element('child')
root.append(child)

# 保存 XML 文件
tree.write('output.xml')

import org.w3c.dom.*;
import javax.xml.parsers.*;
import javax.xml.transform.*;
import javax.xml.transform.dom.*;
import javax.xml.transform.stream.*;

// 创建一个 XML DOM 文档
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document doc = builder.newDocument();

// 添加根元素
Element root = doc.createElement("root");
doc.appendChild(root);

// 添加子元素
Element child = doc.createElement("child");
root.appendChild(child);

// 将 DOM 文档保存为 XML 文件
TransformerFactory transformerFactory = TransformerFactory.newInstance();
Transformer transformer = transformerFactory.newTransformer();
Source source = new DOMSource(doc);
Result result = new StreamResult(new File("output.xml"));
transformer.transform(source, result);