Java Utililty Methods XML Node to String

StringBuilder sb = new StringBuilder();
if (n instanceof Text)
    return n.getNodeValue().trim();
else {
    NodeList nl = n.getChildNodes();
    for (int i = 0; i < nl.getLength(); i++) {
        Node child = nl.item(i);
        sb.append(nodeToString(child));
...

if (node == null) {
    return null;
final Transformer transformer;
try {
    transformer = transformerFactory.newTransformer();
} catch (TransformerConfigurationException e) {
    throw new IllegalStateException(String.format("Failed to build %s", Transformer.class.getName()), e);
...

String ret = "<null/>";
if (node != null) {
    ret = "<" + node.getNodeName() + " ";
    NamedNodeMap attrs = node.getAttributes();
    if (attrs != null) {
        for (int i = 0; i < attrs.getLength(); i++) {
            Node attr = (Node) attrs.item(i);
            ret = ret + attr.getNodeName() + "='";
...

String strNode = "";
Node nodeIt = node;
if (nodeIt instanceof Element) {
    Element elem = (Element) nodeIt;
    String strElem = "";
    strElem += "<" + elem.getTagName();
    NamedNodeMap attribs = elem.getAttributes();
    int len = attribs.getLength();
...

try {
    Transformer transformer = TransformerFactory.newInstance().newTransformer();
    transformer.setOutputProperty(OutputKeys.INDENT, "yes");
    StreamResult result = new StreamResult(new StringWriter());
    DOMSource source = new DOMSource(node);
    transformer.transform(source, result);
    return result.getWriter().toString();
} catch (TransformerConfigurationException ex) {
...

try {
    if (node != null && node.getLocalName().equals("temporary-simple-type-wrapper")) {
        return node.getTextContent();
    TransformerFactory transformerFactory = TransformerFactory.newInstance();
    Transformer transformer = transformerFactory.newTransformer();
    StringWriter stringWriter = new StringWriter();
    transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
...

TransformerFactory transfac = TransformerFactory.newInstance();
Transformer trans = transfac.newTransformer();
trans.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
trans.setOutputProperty(OutputKeys.INDENT, "yes");
StringWriter sw = new StringWriter();
StreamResult result = new StreamResult(sw);
DOMSource source = new DOMSource(node);
trans.transform(source, result);
...

StringWriter writer = new StringWriter();
writeNode(node, writer);
return writer.toString();

StringWriter stringWriter = new StringWriter();
Transformer transformer = TransformerFactory.newInstance().newTransformer();
transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
transformer.transform(new DOMSource(node), new StreamResult(stringWriter));
return stringWriter.toString();

Source source = new DOMSource(node);
StringWriter stringWriter = new StringWriter();
Result result = new StreamResult(stringWriter);
TransformerFactory transformerFactory = TransformerFactory.newInstance();
Transformer transformer = transformerFactory.newTransformer();
transformer.transform(source, result);
return stringWriter.getBuffer().toString();