// : c12:ChannelCopy.java
// Copying a file using channels and buffers
// {Args: ChannelCopy.java test.txt}
// {Clean: test.txt}
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
public class ChannelCopy {
private static final int BSIZE = 1024;
public static void main(String[] args) throws Exception {
if (args.length != 2) {
System.out.println("arguments: sourcefile destfile");
System.exit(1);
}
FileChannel in = new FileInputStream(args[0]).getChannel(), out = new FileOutputStream(
args[1]).getChannel();
ByteBuffer buffer = ByteBuffer.allocate(BSIZE);
while (in.read(buffer) != -1) {
buffer.flip(); // Prepare for writing
out.write(buffer);
buffer.clear(); // Prepare for reading
}
}
} ///:~