IOUtils.java

package br.com.mcde.sistema.utils;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.nio.channels.Channels;
import java.nio.channels.ReadableByteChannel;
import java.nio.channels.WritableByteChannel;

/**
 * Class that manages files using Java 8 NIO
 * */
public class IOUtil {

	public void copy(final InputStream src, final OutputStream dest) throws IOException {
		final ReadableByteChannel inputChannel = Channels.newChannel(src);
		final WritableByteChannel outputChannel = Channels.newChannel(dest);
		copy(inputChannel, outputChannel);
	}

	public void copy(final ReadableByteChannel src, final WritableByteChannel dest) throws IOException {
		final ByteBuffer buffer = ByteBuffer.allocateDirect(16 * 1024);

		while (src.read(buffer) != -1) {
			buffer.flip();
			dest.write(buffer);
			buffer.compact();
		}

		buffer.flip();

		while (buffer.hasRemaining()) {
			dest.write(buffer);
		}
	}
}