在PI Java Mapping中使用GSON实现XML到JSON的转换

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import java.io.StringReader;

public class XMLtoJSONMapping {

    public String convertXMLtoJSON(String xmlData) {
        try {
            // 解析XML
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            DocumentBuilder builder = factory.newDocumentBuilder();
            Document document = builder.parse(new InputSource(new StringReader(xmlData)));

            // 转换为JSON
            Element rootElement = document.getDocumentElement();
            Gson gson = new GsonBuilder().setPrettyPrinting().create();
            String jsonData = convertElementToJSON(rootElement, gson);

            return jsonData;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    private String convertElementToJSON(Element element, Gson gson) {
        JsonObject json = new JsonObject();
        NodeList childNodes = element.getChildNodes();

        for (int i = 0; i < childNodes.getLength(); i++) {
            Node node = childNodes.item(i);

            if (node instanceof Element) {
                Element childElement = (Element) node;
                String nodeName = childElement.getNodeName();
                String nodeValue = childElement.getTextContent();

                if (childElement.hasChildNodes()) {
                    json.add(nodeName, convertElementToJSON(childElement, gson));
                } else {
                    json.addProperty(nodeName, nodeValue);
                }
            }
        }

        return gson.toJson(json);
    }
}