JAVA 新I/O 之 FileChannel，ByteBuffer

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;

public class GetChannel {

	static final int BSIZE = 1024;

	public static void main(String[] args) throws Exception {
		FileChannel channel = new FileOutputStream("data.txt").getChannel();
		channel.write(ByteBuffer.wrap("Some text".getBytes()));
		channel.close();

		channel = new RandomAccessFile("data.txt", "rw").getChannel();
		channel.position(channel.size());// 移动到文件结尾
		channel.write(ByteBuffer.wrap(" Some more".getBytes()));
		channel.close();

		channel = new FileInputStream("data.txt").getChannel();
		ByteBuffer buffer = ByteBuffer.allocate(BSIZE);
		channel.read(buffer);
		buffer.flip();// 反转此通道
		while (buffer.hasRemaining()) {
			System.out.println((char) buffer.get());
		}
	}
}