Java Utililty Methods BufferedInputStream Copy

if (source.isDirectory()) {
    File subtarget = new File(target, source.getName());
    copyDirContent(source, subtarget);
} else {
    if (!target.exists()) {
        if (!target.createNewFile()) {
            throw new IOException("Unable to create target file");
    } else if (target.isDirectory()) {
        target = new File(target, source.getName());
    byte[] buf = new byte[2048];
    InputStream in = new BufferedInputStream(new FileInputStream(source));
    OutputStream out = new BufferedOutputStream(new FileOutputStream(target));
    int len;
    while ((len = in.read(buf)) != -1) {
        out.write(buf, 0, len);
    out.flush();
    in.close();
    out.close();

FileOutputStream fos = null;
FileInputStream fis = null;
BufferedInputStream bis;
int n;
byte[] buf = new byte[2048];
try {
    fos = new FileOutputStream(target);
    fis = new FileInputStream(source);
...

InputStream from = new BufferedInputStream(new FileInputStream(sourceFile));
OutputStream to = new BufferedOutputStream(new FileOutputStream(targetFile));
byte[] buffer = new byte[16 * 1024];
int bytesRead;
while ((bytesRead = from.read(buffer)) != -1) {
    to.write(buffer, 0, bytesRead);
to.flush();
...

if (sourceFile == null || targetFile == null) {
    throw new NullPointerException("sourceFile and targetFile must not be null"); 
File directory = targetFile.getParentFile();
if (!directory.exists() && !directory.mkdirs()) {
    throw new IOException("Could not create directory '" + directory + "'"); 
InputStream inputStream = null;
...

BufferedInputStream inBuff = null;
BufferedOutputStream outBuff = null;
try {
    inBuff = new BufferedInputStream(new FileInputStream(sourceFile));
    outBuff = new BufferedOutputStream(new FileOutputStream(targetFile));
    byte[] buffer = new byte[BUFFER];
    int length;
    while ((length = inBuff.read(buffer)) != -1) {
...

InputStream ss = null;
OutputStream ds = null;
try {
    ss = new BufferedInputStream(new FileInputStream(src));
    ds = new BufferedOutputStream(new FileOutputStream(dest));
    copyStream(ss, ds);
} finally {
    if (ds != null) {
...

FileInputStream in = new FileInputStream(src);
try {
    byte[] bs = getContentBytes(in);
    saveFile(dest, bs);
} finally {
    in.close();

InputStream in = null;
OutputStream out = null;
byte[] buf = null;
int bufLen = 20000 * 1024;
try {
    in = new BufferedInputStream(new FileInputStream(src));
    out = new BufferedOutputStream(new FileOutputStream(dest));
    buf = new byte[bufLen];
...

if (!src.exists())
    throw new IOException("File not found '" + src.getAbsolutePath() + "'");
BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(dest));
BufferedInputStream in = new BufferedInputStream(new FileInputStream(src));
byte[] read = new byte[4096];
int len;
while ((len = in.read(read)) > 0)
    out.write(read, 0, len);
...

int totalCopied = 0;
if (dst.isDirectory())
    dst = new File(dst, src.getName());
InputStream from = null;
OutputStream to = null;
try {
    from = new FileInputStream(src);
    to = new FileOutputStream(dst);
...