ByteBuffer over SocketChannel

Question

我试图通过开始发送文件名来获得文件移动到IP (SocketChannel)。我认为这个问题是在ByteBuffer的阅读，但我不确定如何纠正它。

filesend部分:

    public void sendFile(SocketChannel socketChannel) {
    try {
        File file = new File("B:\Software\OLD.zip");
        String filename = file.getName();
        byte[] nameBytes = filename.getBytes();
        ByteBuffer nameBuffer = ByteBuffer.wrap(nameBytes);
        socketChannel.write(nameBuffer);
        //FileChannel inChannel = aFile.getChannel();
        FileChannel inChannel = FileChannel.open(file.toPath());
        ByteBuffer buffer = ByteBuffer.allocate(32 * 1024); // 32.76800 kilobytes
        System.out.println(" Sendding nameBuffer: "+nameBuffer);
        int bytesread = inChannel.read(buffer);
        while (bytesread != -1) {
            buffer.flip();
            socketChannel.write(buffer);
            buffer.compact();
            bytesread = inChannel.read(buffer);
        }
        Thread.sleep(1000);
        System.out.println(" System Info! @LargeFileSender - End of file reached!");
        socketChannel.close();
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    } catch (InterruptedException e) {
        e.printStackTrace();
    }

这是我认为导致问题的filerreceiver的一部分。

    public void readFileFromSocket(SocketChannel socketChannel) {
    long startTime = System.currentTimeMillis();
    try {
        ByteBuffer namebuff = ByteBuffer.allocate(512);
        socketChannel.read(namebuff);
        System.out.println(" Receiving namebuff: " + namebuff);
        byte[] namebyte = new byte[512];
        String filename = "";
        int position = namebuff.position();
        System.out.println(" Receiving position: " + position);
        while (namebuff.hasRemaining()) {
            namebyte[position] = namebuff.get();
            position = namebuff.position();
        }
        filename = new String(namebyte, 0, position);
        System.out.println(" File namebyte: " + namebyte[7]);
        System.out.println(" File Name: " + filename);
        File file = new File(filename);
        ByteBuffer buffer = ByteBuffer.allocate(32 * 1024); // 32.76800
        FileOutputStream aFile = new FileOutputStream(file);
        FileChannel fileChannel = aFile.getChannel();
        BigDecimal bigDecimal = new BigDecimal(0.0);
        BigDecimal kilobyteDecimal = new BigDecimal(32.76);
        while (socketChannel.read(buffer) > 0) {
            buffer.flip();
            fileChannel.write(buffer);
            buffer.compact();
            bigDecimal = bigDecimal.add(kilobyteDecimal);
        }
        Thread.sleep(1000);
        fileChannel.close();
        buffer.clear();
        ProgressDial.main("false");
        Thread.sleep(2000);
        System.out.println(" System Info! @FileReceiver - Transfer completed!");
        socketChannel.close();
        aFile.close();
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    } catch (InterruptedException e) {
        e.printStackTrace();
    }
}

我个人认为问题在这里，因为文件名是"null"

            while (namebuff.hasRemaining()) {
            namebyte[position] = namebuff.get();
            position = namebuff.position();
        }
        filename = new String(namebyte, 0, position);

任何帮助都将是非常感激的。

多谢

Answer 1

经过大量的测试和尝试，我终于使用StringBuilder修复了我的问题，结果正是我想要的:FileName:

        try {
        ByteBuffer namebuff = ByteBuffer.allocate(256);
        socketChannel.read(namebuff);
        int position = namebuff.position();
        namebuff.rewind();
        String filename = "";
        int startPosition = 0;
        System.out.println(" Receiving position: "+position);
        StringBuilder sb = new StringBuilder();
        while (startPosition < position) {
            sb.append((char)namebuff.get());
            startPosition++;
        }
        filename = sb.toString();
        System.out.println(" FileName: "+filename);