如何优化此代码以从JSON转换为XML？

Question

我使用此代码将JSON转换为XML：

DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
Document document = documentBuilder.newDocument();
document = standardJsonToXML(hierarchyData, document, null);
TransformerFactory transformerFactory = TransformerFactory.newInstance();
Transformer transformer = transformerFactory.newTransformer();
DOMSource source = new DOMSource(document);
StringWriter writer = new StringWriter();
StreamResult result = new StreamResult(writer);

transformer.transform(source, result);

return writer.toString();

我如何提高其表现？