ChannelCopy.java Source code

Introduction

Here is the source code for ChannelCopy.java

Source

// : 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
        }
    }
} ///:~