Java Utililty Methods XML Document Serialize

DOMImplementationLS domImplementation = (DOMImplementationLS) doc.getImplementation();
LSSerializer lsSerializer = domImplementation.createLSSerializer();
LSOutput output = domImplementation.createLSOutput();
output.setEncoding("UTF-8");
StringWriter stringOut = new StringWriter();
output.setCharacterStream(stringOut);
lsSerializer.write(doc, output);
return stringOut.toString();
...

TransformerFactory tFactory = TransformerFactory.newInstance();
Transformer transformer = null;
try {
    transformer = tFactory.newTransformer();
} catch (TransformerConfigurationException e) {
    throw new IOException("Unable to serialize XML document");
transformer.setOutputProperty(OutputKeys.INDENT, "no");
...

try {
    DOMSource domSource = new DOMSource(doc);
    StringWriter writer = new StringWriter();
    StreamResult result = new StreamResult(writer);
    TransformerFactory tf = TransformerFactory.newInstance();
    Transformer transformer = tf.newTransformer();
    transformer.setOutputProperty(OutputKeys.INDENT, "no");
    transformer.transform(domSource, result);
...

Note: this method is supposed to be faster than the Transform version but the output control is limited.

DOMImplementationLS domImpl = (DOMImplementationLS) doc.getImplementation();
LSSerializer lsSerializer = domImpl.createLSSerializer();
LSOutput output = domImpl.createLSOutput();
output.setEncoding(encoding);
StringWriter writer = new StringWriter();
output.setCharacterStream(writer);
lsSerializer.write(node, output);
writer.flush();
...

serializeXML(doc.getDocumentElement(), writer, addXmlDeclaration);

org.w3c.dom.ls.DOMImplementationLS impl = (org.w3c.dom.ls.DOMImplementationLS) org.w3c.dom.bootstrap.DOMImplementationRegistry
        .newInstance().getDOMImplementation("LS");
org.w3c.dom.ls.LSSerializer writer = impl.createLSSerializer();
org.w3c.dom.DOMConfiguration config = writer.getDomConfig();
config.setParameter("xml-declaration", false);
config.setParameter("format-pretty-print", Boolean.TRUE);
String serializedXML = writer.writeToString(docToSerialize);
return serializedXML;
...

try {
    TransformerFactory transformerFactory = TransformerFactory.newInstance();
    Transformer transformer = transformerFactory.newTransformer();
    DOMSource domSource = new DOMSource(document);
    StreamResult result = new StreamResult(output);
    transformer.transform(domSource, result);
} catch (TransformerConfigurationException e) {
    e.printStackTrace();
...