Java Utililty Methods FileInputStream Copy

try {
    Scanner fromScanner = new Scanner(new FileInputStream(from));
    PrintStream out = new PrintStream(new BufferedOutputStream(new FileOutputStream(to)));
    while (fromScanner.hasNextByte()) {
        out.print(fromScanner.nextByte());
    out.close();
    fromScanner.close();
...

if (!from.exists()) {
    throw new FileNotFoundException("File '" + from.getAbsolutePath() + "' does not exist.");
InputStream in = null;
try {
    in = new FileInputStream(from);
    writeFile(in, to);
} finally {
...

try (InputStream in = new FileInputStream(from); OutputStream out = new FileOutputStream(to)) {
    byte[] buff = new byte[1024];
    int len;
    while ((len = in.read(buff)) > 0) {
        out.write(buff, 0, len);

if (buf == null)
    buf = new byte[BUFFER_SIZE];
FileInputStream from_s = null;
FileOutputStream to_s = null;
try {
    from_s = new FileInputStream(from);
    to_s = new FileOutputStream(to);
    for (int bytesRead = from_s.read(buf); bytesRead > 0; bytesRead = from_s.read(buf)) {
...

if (!toDir.isDirectory() || !from.exists()) {
    throw new IOException("Destination is no Directory or source not exists.");
copy(from, new File(toDir, from.getName()));

copyFile(from, toFile, null);

FileOutputStream to;
try (FileInputStream from = new FileInputStream(fromFile)) {
    to = new FileOutputStream(toFile);
    byte[] buffer = new byte[4096];
    int bytesRead;
    while ((bytesRead = from.read(buffer)) > 0)
        to.write(buffer, 0, bytesRead);
to.close();

if (toFile.isDirectory())
    toFile = new File(toFile, fromFile.getName());
FileInputStream from = null;
FileOutputStream to = null;
try {
    from = new FileInputStream(fromFile);
    File p = toFile.getParentFile();
    if (p != null && !p.exists())
...

String fromFileName = fromFile.getName();
String toFileName = toFile.getName();
if (!fromFile.exists()) {
    throw new IOException("FileCopy: " + "no such source file: " + fromFile.getPath());
if (!fromFile.isFile()) {
    throw new IOException("FileCopy: " + "can't copy directory: " + fromFileName);
if (!fromFile.canRead()) {
    throw new IOException("FileCopy: " + "source file is unreadable: " + fromFileName);
if (toFile.isDirectory()) {
    toFile = new File(toFile, fromFile.getName());
String parent = toFile.getParent();
if (parent == null) {
    parent = System.getProperty("user.dir");
File dir = new File(parent);
if (!dir.exists()) {
    throw new IOException("FileCopy: " + "destination directory doesn't exist: " + parent);
if (dir.isFile()) {
    throw new IOException("FileCopy: " + "destination is not a directory: " + parent);
if (!dir.canWrite()) {
    throw new IOException("FileCopy: " + "destination directory is unwriteable: " + parent);
FileInputStream from;
from = new FileInputStream(fromFile);
copyFile(from, toFile);

byte[] data = new byte[4096];
InputStream in = new FileInputStream(fromFile);
toFile.delete();
OutputStream out = new FileOutputStream(toFile);
monitor.beginTask("Copy " + fromFile.toString(), (int) fromFile.length());
int count = in.read(data);
while (count != -1) {
    out.write(data, 0, count);
...