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// : c12:GetChannel.java
// Getting channels from streams
// {Clean: data.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.io.RandomAccessFile;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
public class GetChannel {
private static final int BSIZE = 1024;
public static void main(String[] args) throws Exception {
// Write a file:
FileChannel fc = new FileOutputStream("data.txt").getChannel();
fc.write(ByteBuffer.wrap("Some text ".getBytes()));
fc.close();
// Add to the end of the file:
fc = new RandomAccessFile("data.txt", "rw").getChannel();
fc.position(fc.size()); // Move to the end
fc.write(ByteBuffer.wrap("Some more".getBytes()));
fc.close();
// Read the file:
fc = new FileInputStream("data.txt").getChannel();
ByteBuffer buff = ByteBuffer.allocate(BSIZE);
fc.read(buff);
buff.flip();
while (buff.hasRemaining())
System.out.print((char) buff.get());
}
} ///:~
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