将xml转换为hashmap，反之亦然

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

public class XMLToHashMap {
    public static void main(String[] args) {
        try {
            // 加载XML文件
            File xmlFile = new File("data.xml");
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            DocumentBuilder builder = factory.newDocumentBuilder();
            Document doc = builder.parse(xmlFile);

            // 创建HashMap
            HashMap<String, String> hashMap = new HashMap<>();

            // 遍历XML节点
            NodeList nodeList = doc.getDocumentElement().getChildNodes();
            for (int i = 0; i < nodeList.getLength(); i++) {
                Node node = nodeList.item(i);
                if (node.getNodeType() == Node.ELEMENT_NODE) {
                    Element element = (Element) node;
                    String key = element.getTagName();
                    String value = element.getTextContent();
                    hashMap.put(key, value);
                }
            }

            // 输出HashMap
            System.out.println(hashMap);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

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.util.HashMap;

public class HashMapToXML {
    public static void main(String[] args) {
        try {
            // 创建HashMap
            HashMap<String, String> hashMap = new HashMap<>();
            hashMap.put("key1", "value1");
            hashMap.put("key2", "value2");

            // 创建XML文档对象
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            DocumentBuilder builder = factory.newDocumentBuilder();
            Document doc = builder.newDocument();

            // 创建根节点
            Element rootElement = doc.createElement("data");
            doc.appendChild(rootElement);

            // 遍历HashMap
            for (String key : hashMap.keySet()) {
                String value = hashMap.get(key);

                // 创建子节点
                Element element = doc.createElement(key);
                element.appendChild(doc.createTextNode(value));
                rootElement.appendChild(element);
            }

            // 将XML文档保存为文件或者生成XML字符串
            TransformerFactory transformerFactory = TransformerFactory.newInstance();
            Transformer transformer = transformerFactory.newTransformer();
            transformer.setOutputProperty(OutputKeys.INDENT, "yes");
            DOMSource source = new DOMSource(doc);
            StreamResult result = new StreamResult(new File("data.xml"));
            transformer.transform(source, result);

            System.out.println("XML file saved!");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}