Java Utililty Methods XML Document to Stream

TransformerFactory transformerFactory = TransformerFactory.newInstance();
StreamSource stylesource = new StreamSource(style);
Transformer transformer = transformerFactory.newTransformer(stylesource);
transformer.setOutputProperty(OutputKeys.INDENT, "yes");
transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "2");
DOMSource source = new DOMSource(doc);
StreamResult result = new StreamResult(output);
transformer.transform(source, result);
...

ClassLoader cl = Thread.currentThread().getContextClassLoader();
Class xmlSerializerClazz = Class.forName("org.apache.xml.serialize.XMLSerializer", true, cl); 
Class outputFormatClazz = Class.forName("org.apache.xml.serialize.OutputFormat", true, cl); 
Object xmlSerializer = xmlSerializerClazz.newInstance();
Object outputFormat = outputFormatClazz.newInstance();
Method setMethod = outputFormatClazz.getMethod("setMethod", new Class[] { String.class }); 
setMethod.invoke(outputFormat, new Object[] { "xml" }); 
Method setIndenting = outputFormatClazz.getMethod("setIndenting", new Class[] { Boolean.TYPE }); 
...

javax.xml.transform.Result result = new StreamResult(out);
Transformer xformer;
try {
    xformer = TransformerFactory.newInstance().newTransformer();
    xformer.setOutputProperty(OutputKeys.INDENT, "yes");
    xformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
    xformer.setOutputProperty(OutputKeys.DOCTYPE_PUBLIC, HTML_XHTML_TRANSITIONAL_DOCTYPE_PUBLIC);
    xformer.setOutputProperty(OutputKeys.DOCTYPE_SYSTEM, HTML_XHTML_TRANSITIONAL_DOCTYPE_SYSTEM);
...

PrintWriter out = new PrintWriter(new OutputStreamWriter(os, "UTF-8"));
out.println("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
out.println();
if (sysID != null) {
    out.println("<!DOCTYPE " + d.getDoctype().getName() + " SYSTEM \"" + sysID + "\">");
    out.println();
writeXMLwalkTree(d.getDocumentElement(), 0, out);
...

DOMImplementationLS DOMiLS = (DOMImplementationLS) d.getImplementation();
;
LSOutput LSO = DOMiLS.createLSOutput();
LSO.setByteStream(out);
LSSerializer LSS = DOMiLS.createLSSerializer();
if (!LSS.write(d, LSO)) {
    throw new IOException("[Serialization failed!]");

TransformerFactory tFactory = TransformerFactory.newInstance();
Transformer transformer = tFactory.newTransformer();
transformer.setOutputProperty(OutputKeys.INDENT, "yes");
transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "2");
doc.getDocumentElement().normalize();
DOMSource source = new DOMSource(doc);
StreamResult result = new StreamResult(os);
transformer.transform(source, result);
...

TransformerFactory tFactory = TransformerFactory.newInstance();
Transformer transformer = tFactory.newTransformer();
formatXML(doc, doc.getDocumentElement(), "  ");
doc.getDocumentElement().normalize();
DOMSource source = new DOMSource(doc);
StreamResult result = new StreamResult(os);
transformer.transform(source, result);
os.close();
...

OutputStreamWriter osw = new OutputStreamWriter(out);
com.sun.org.apache.xerces.internal.dom.DOMOutputImpl domoutputimpl = new com.sun.org.apache.xerces.internal.dom.DOMOutputImpl();
domoutputimpl.setEncoding(doc.getXmlEncoding());
domoutputimpl.setCharacterStream(osw);
org.w3c.dom.ls.LSSerializer serializer;
org.w3c.dom.ls.DOMImplementationLS dils;
dils = (org.w3c.dom.ls.DOMImplementationLS) doc.getImplementation();
serializer = dils.createLSSerializer();
...

try {
    Source source = new DOMSource(doc);
    Result result = new StreamResult(outputStream);
    Transformer xformer = TransformerFactory.newInstance().newTransformer();
    try {
        xformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "3");
    } catch (IllegalArgumentException e) { 
    try {
        xformer.setOutputProperty(OutputKeys.INDENT, "yes");
    } catch (IllegalArgumentException e) { 
    xformer.transform(source, result);
} catch (TransformerConfigurationException e) {
    throw new IllegalStateException(e);
} catch (TransformerException e) {
    throw new IllegalStateException(e);

DOMSource src = new DOMSource(document);
StreamResult res = new StreamResult(os);
TransformerFactory tf = TransformerFactory.newInstance();
try {
    Transformer t = tf.newTransformer();
    t.transform(src, res);
} catch (TransformerException e) {
    throw new IOException(e.getMessage());
...