Copying a file using channels and buffers

    

// : 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
    }
  }
} ///:~

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Copying a file using channels and buffers : File Commands « File Input Output « Java

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