Copying a file or directory used to be a typical development task. It’s a fundamental concept, and it might be useful to know what options does the Java developers have when they need to copy a file. Read more about Java IO classes to see available options for reading and writing files.
the standard way to copy a file was by utilizing I/O Streams:
private void copyFile(File src, File dest) throws IOException {
InputStream inputStream = null;
OutputStream outputStream = null;
try {
inputStream = new FileInputStream(source);
outputStream = new FileOutputStream(dest);
// the size of the buffer doesn't have to be exactly 1024 bytes,
// try playing around with this number and see what effect
// it will have on the performance
byte[] buffer = new byte[1024];
int length = 0;
while ((length = is.read(buffer)) > 0) {
os.write(buffer, 0, length);
}
} finally {
is.close();
os.close();
}
}
Using a classes from java.nio package:
private void copyFileUsingChannel(File src, File dest) throws IOException {
FileChannel sourceChannel = null;
FileChannel destinationChannel = null;
try {
sourceChannel = new FileInputStream(src).getChannel();
destinationChannel = new FileOutputStream(dest).getChannel();
destinationChannel.transferFrom(sourceChannel, 0, sourceChannel.size());
} finally {
sourceChannel.close();
destinationChannel.close();
}
}
Using java.nio.Files class which consists exclusively of static methods that operate on files,
directories, or other types of files.
Take a look at the API documentation
to read more and see available options to the copy() method:
private static void copyFile(File src, File dest) throws IOException {
Files.copy(src.toPath(), dest.toPath());
}