FileChannel和ByteBuffer写入额外数据

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

public class FileChannelExample {
    public static void main(String[] args) {
        try {
            RandomAccessFile file = new RandomAccessFile("example.txt", "rw");
            FileChannel channel = file.getChannel();

            String data = "Hello, World!";
            ByteBuffer buffer = ByteBuffer.allocate(1024);
            buffer.put(data.getBytes());
            buffer.flip();

            int bytesWritten = channel.write(buffer);
            System.out.println("Bytes written: " + bytesWritten);

            channel.close();
            file.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}