Java Utililty Methods File Copy

try {
    File w = new File(to, from.getName());
    if (!w.exists())
        w.createNewFile();
    BufferedOutputStream write = new BufferedOutputStream(new FileOutputStream(w));
    BufferedInputStream read = new BufferedInputStream(new FileInputStream(from));
    byte[] buffer = new byte[1024];
    int l = 0;
...

copyFile(source.toPath(), target.toPath());

InputStream in = new FileInputStream(src);
OutputStream out = new FileOutputStream(dest);
copyFile(in, out, parentComponent, message);
out.flush();
out.close();
in.close();
dest.setLastModified(src.lastModified());

try {
    File in = new File(sourceFileName);
    FileChannel inChannel = new FileInputStream(in).getChannel();
    FileChannel outChannel = new FileOutputStream(target).getChannel();
    try {
        inChannel.transferTo(0, inChannel.size(), outChannel);
    } catch (IOException e) {
        throw e;
...

if (file.isDirectory()) {
    File dest = new File(destPath, file.getName());
    File[] files = file.listFiles();
    for (File subFile : files) {
        copyFiles(subFile, dest);
} else {
    copyFile(file, destPath);
...

String[] names = fromDir.list();
if (names != null) {
    for (int i = 0; i < names.length; i += 1) {
        File fromFile = new File(fromDir, names[i]);
        if (fromFile.isDirectory()) {
            continue;
        File toFile = new File(toDir, names[i]);
...

copyStreams(new FileInputStream(source), new FileOutputStream(destination));

copyFiles(sourceFile, sourceFile, targetDir);

if (!src.exists()) {
    throw new IOException("copyFiles: Can not find source: " + src.getAbsolutePath() + ".");
} else if (!src.canRead()) { 
    throw new IOException("copyFiles: No right to source: " + src.getAbsolutePath() + ".");
if (src.isDirectory()) {
    if (!dest.exists()) { 
        if (!dest.mkdirs()) {
...

if (!src.exists()) {
    throw new IOException("Resource does not exist: " + src.getAbsolutePath());
} else if (!src.canRead()) {
    throw new IOException("Insufficient privileges to open: " + src.getAbsolutePath());
if (src.isDirectory()) {
    if (!dest.exists() || !dest.mkdirs()) {
        throw new IOException("Cannot create: " + dest.getAbsolutePath());
...