使用Java将YAML转化成XML

以下是使用Java将YAML转换为XML的代码示例：

import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import org.yaml.snakeyaml.Yaml;
import org.yaml.snakeyaml.constructor.Constructor;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import javax.xml.parsers.DocumentBuilderFactory;

public class YAMLtoXML {
    public static void main(String[] args) {
        try {
            // 读取YAML文件
            File file = new File("example.yaml");
            FileInputStream input = new FileInputStream(file);
            Constructor constructor = new Constructor();
            Yaml yaml = new Yaml(constructor);

            // 将YAML转换为Java对象
            Object data = yaml.load(input);

            // 将Java对象转换为XML
            DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
            Document doc = docFactory.newDocumentBuilder().newDocument();
            Element rootElement = doc.createElement("root");
            doc.appendChild(rootElement);
            for (Object key : ((Map<?, ?>) data).keySet()) {
                Element element = doc.createElement(key.toString());
                element.setTextContent(((Map<?, ?>) data).get(key).toString());
                rootElement.appendChild(element);
            }

            // 将XML写入文件
            FileWriter writer = new FileWriter("example.xml");
            writer.write(docToString(doc));
            writer.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private static String docToString(Document doc) {
        try {
            Transformer transformer = TransformerFactory.newInstance().newTransformer();
            transformer.setOutputProperty(OutputKeys.INDENT, "yes");
            StreamResult result = new StreamResult(new StringWriter());
            DOMSource source = new DOMSource(doc);
            transformer.transform(source, result);
            return result.getWriter().toString();
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
}

这个代码使用SnakeYAML库将YAML文件中的数据读取到一个Java对象中，然后使用Java标准库中的Document和Element类将数据转换为XML格式，并将结果写入文件。注意需要引入相关的库文件。