JSONObject转换xml

你可以使用以下步骤来将JSONObject转换为XML：

1. 创建一个新的Document对象。
2. 将JSONObject的数据逐个遍历，以键值对的形式添加到新的Document对象中。
3. 使用Transformer将Document对象转换为XML字符串。

下面是一个示例代码，使用Java中的org.json和org.w3c.dom库来实现JSONObject到XML的转换：

import org.json.JSONObject;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
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;

public class JsonToXmlConverter {

    public static void main(String[] args) {
        JSONObject jsonObject = new JSONObject("{\"name\":\"John\",\"age\":30,\"city\":\"New York\"}");

        try {
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            DocumentBuilder builder = factory.newDocumentBuilder();
            Document document = builder.newDocument();

            Element rootElement = document.createElement("data");
            document.appendChild(rootElement);

            addJsonObjectToElement(jsonObject, document, rootElement);

            TransformerFactory transformerFactory = TransformerFactory.newInstance();
            Transformer transformer = transformerFactory.newTransformer();
            transformer.setOutputProperty(OutputKeys.INDENT, "yes");

            DOMSource source = new DOMSource(document);
            StreamResult result = new StreamResult(System.out);
            
            transformer.transform(source, result);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private static void addJsonObjectToElement(JSONObject jsonObject, Document document, Element element) {
        for (String key : jsonObject.keySet()) {
            Object value = jsonObject.get(key);

            if (value instanceof JSONObject) {
                Element subElement = document.createElement(key);
                element.appendChild(subElement);
                addJsonObjectToElement((JSONObject) value, document, subElement);
            } else {
                Element subElement = document.createElement(key);
                subElement.appendChild(document.createTextNode(value.toString()));
                element.appendChild(subElement);
            }
        }
    }
}

运行上述代码，会将JSONObject `{"name":"John","age":30,"city":"New York"}` 转换为如下的XML字符串：

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<data>
    <name>John</name>
    <age>30</age>
    <city>New York</city>
</data>