如何在java中打印格式正确的无效XML片段？

I've tried

我试过了

SAXParserFactory factory = SAXParserFactory.newInstance();
factory.setNamespaceAware(false);
factory.setValidating(false);
XMLReader reader = factory.newSAXParser().getXMLReader();
Source xmlInput = new SAXSource(reader, new InputSource(new StringReader(xml)));
StringWriter stringWriter = new StringWriter();
xmlPretty = new StreamResult(stringWriter);   
Transformer transformer = TransformerFactory.newInstance().newTransformer();
transformer.setOutputProperty(OutputKeys.INDENT, "yes");
transformer.setOutputProperty("{https://xml.apache.org/xslt}indent-amount", "2");
transformer.transform(xmlInput, xmlPretty);
return xmlPretty.getWriter().toString();
SAXParserFactory factory =