Java Utililty Methods XML Document to File

DOMSource source = new DOMSource(doc);
File path = new File(System.getProperty("test.dir"), outName);
Result result = new StreamResult(new FileOutputStream(path));
Transformer trans = TransformerFactory.newInstance().newTransformer();
trans.setOutputProperty(OutputKeys.INDENT, "yes");
trans.transform(source, result);

try {
    file.getParentFile().mkdirs();
    String s = file.getAbsolutePath();
    TransformerFactory.newInstance().newTransformer().transform(new DOMSource(doc),
            new StreamResult(new FileOutputStream(s)));
    return true;
} catch (Exception e) {
    return false;
...

if (xmlFile == null) {
    throw new NullPointerException("xmlFile");
if (xmlFile.exists() && !xmlFile.canWrite()) {
    throw new IllegalArgumentException("xmlFile");
if (xmlFile.exists() && !xmlFile.isFile()) {
    throw new IllegalArgumentException("xmlFile");
...

try {
    Transformer t = TransformerFactory.newInstance().newTransformer();
    DocumentType dt = doc.getDoctype();
    if (dt != null) {
        String pub = dt.getPublicId();
        if (pub != null) {
            t.setOutputProperty(OutputKeys.DOCTYPE_PUBLIC, pub);
        t.setOutputProperty(OutputKeys.DOCTYPE_SYSTEM, dt.getSystemId());
    t.setOutputProperty(OutputKeys.ENCODING, "UTF-8"); 
    t.setOutputProperty(OutputKeys.INDENT, "yes"); 
    t.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4"); 
    Source source = new DOMSource(doc);
    Result result = new StreamResult(out);
    t.transform(source, result);
} catch (Exception e) {
    throw (IOException) new IOException(e.toString()).initCause(e);
} catch (TransformerFactoryConfigurationError e) {
    throw (IOException) new IOException(e.toString()).initCause(e);

try {
    final DOMSource source = new DOMSource(doc);
    final StreamResult result = new StreamResult(file);
    final TransformerFactory factory = TransformerFactory.newInstance();
    final Transformer transformer = factory.newTransformer();
    transformer.transform(source, result);
} catch (TransformerConfigurationException e) {
    throw new RuntimeException(e);
...

try {
    Source source = new DOMSource(doc);
    Result result = new StreamResult(file);
    TransformerFactory transformerFactory = TransformerFactory.newInstance();
    transformerFactory.setAttribute("indent-number", 4);
    Transformer transformer = transformerFactory.newTransformer();
    transformer.setOutputProperty(OutputKeys.INDENT, "yes");
    transformer.transform(source, result);
...

String s = null;
try {
    OutputFormat format = new OutputFormat("XML", "UTF-8", true);
    if (aFile != null) {
        FileOutputStream out = new FileOutputStream(aFile);
        XMLSerializer serializer = new XMLSerializer(out, format);
        serializer.serialize(doc);
        out.close();
...

TransformerFactory transformerFactory = SAXTransformerFactory.newInstance();
Transformer transformer = transformerFactory.newTransformer();
DOMSource source = new DOMSource(doc);
StreamResult result = new StreamResult(file);
transformer.transform(source, result);

Source source = new DOMSource(doc);
File file = new File(filename);
Result result = new StreamResult(file);
TransformerFactory tFactory = TransformerFactory.newInstance();
tFactory.setAttribute("indent-number", 2);
Transformer xformer = tFactory.newTransformer();
xformer.setOutputProperty(OutputKeys.INDENT, "yes");
xformer.transform(source, result);
...

File encryptionFile = new File("c:\\temp\\" + fileName);
FileOutputStream f = new FileOutputStream(encryptionFile);
TransformerFactory factory = TransformerFactory.newInstance();
Transformer transformer = factory.newTransformer();
transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
DOMSource source = new DOMSource(doc);
StreamResult result = new StreamResult(f);
transformer.transform(source, result);
...