XML- und JSON-Verarbeitung in Java

// 指定XML文件路径
File xmlFile = new File("example.xml");

// 获取DocumentBuilderFactory实例
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();

// 获取DocumentBuilder实例
DocumentBuilder builder = factory.newDocumentBuilder();

// 解析XML文件，生成Document对象
Document document = builder.parse(xmlFile);

// 获取根节点
Element root = document.getDocumentElement();

// 遍历子节点
NodeList nodeList = root.getElementsByTagName("book");
for (int i = 0; i < nodeList.getLength(); i++) {
    Element book = (Element) nodeList.item(i);
    String title = book.getElementsByTagName("title").item(0).getTextContent();
    String author = book.getElementsByTagName("author").item(0).getTextContent();
    String price = book.getElementsByTagName("price").item(0).getTextContent();
    System.out.println("title:" + title + ",author:" + author + ",price:" + price);
}

// 指定XML文件路径
File xmlFile = new File("example.xml");

// 实例化SAXParserFactory对象
SAXParserFactory factory = SAXParserFactory.newInstance();

// 实例化SAXParser对象
SAXParser parser = factory.newSAXParser();

// 读入XML文件，并处理事件
DefaultHandler handler = new DefaultHandler() {
    boolean title = false;
    boolean author = false;
    boolean price = false;

    public void startElement(String uri, String localName, String qName, Attributes attributes) {
        if (qName.equals("title")) {
            title = true;
        } else if (qName.equals("author")) {
            author = true;
        } else if (qName.equals("price")) {
            price = true;
        }
    }

    public void characters(char[] ch, int start, int length) {
        if (title) {
            System.out.println("title:" + new String(ch, start, length));
            title = false;
        } else if (author) {
            System.out.println("author:" + new String(ch, start, length));
            author = false;
        } else if (price) {
            System.out.println("price:" + new String(ch, start, length));
            price = false;
        }
    }
};

parser.parse(xmlFile, handler);

// 定义JSON字符串
String jsonString = "{"name":"Lucy","age":20,"hobby":["reading","music"]}";

// 解析JSON字符串
JSONObject json = new JSONObject(jsonString);

// 获取对象属性
String name = json.getString("name");
int age = json.getInt("age");
JSONArray hobby = json.getJSONArray("hobby");

// 遍历数组
for (int i = 0; i < hobby.length(); i++) {
    System.out.println(hobby.get(i));
}

// 定义JSON字符串
String jsonString = "{"name":"Lucy","age":20,"hobby":["reading","music"]}";

// 解析JSON字符串
Gson gson = new Gson();
User user = gson.fromJson(jsonString, User.class);

// 获取对象属性
String name = user.getName();
int age = user.getAge();
List<String> hobby = user.getHobby();

// 遍历列表
for (String item : hobby) {
    System.out.println(item);
}