Java:区分InputStream中的输入

Question

我有一个InputStream，它在线程上运行并读取通过网络传递的任何数据。我的问题是 - 如何区分 InputStream 对象接收到的字节？例如如果接收到的字节指向 Car 对象，则执行某些操作，如果接收到的字节指向 Person 对象，则执行其他操作。

谢谢。

编辑:这是我的代码片段。看起来还好吗？抱歉，我是网络编程新手。

private class ConnectedThread extends Thread {
        private final BluetoothSocket mmSocket;
        private final InputStream mmInStream;
        private final ObjectOutputStream mmObjOutStream;

        public ConnectedThread(BluetoothSocket socket) {
            Log.d(TAG, "create ConnectedThread");
            mmSocket = socket;
            InputStream tmpIn = null;
            ObjectOutputStream tmpOut = null;

            // Get the BluetoothSocket input and output streams
            try {
                tmpIn = socket.getInputStream();
                tmpOut = new ObjectOutputStream(socket.getOutputStream());
            } catch (IOException e) {
                Log.e(TAG, "temp sockets not created", e);
            }

            mmInStream = tmpIn;
            mmObjOutStream = tmpOut;
        }

        public void run() {
            Log.i(TAG, "BEGIN mConnectedThread");
            byte[] buffer = new byte[1024];
            int bytes;

            // Keep listening to the InputStream while connected
            while (true) {
                try {
                    // Read from the InputStream
                    bytes = mmInStream.read(buffer);
                    Log.i(TAG, "PERFORMING MESSAGE READ");
                    // Send the obtained bytes to the UI Activity
                    mHandler.obtainMessage(GameboardResourceActivity.MESSAGE_READ, bytes, -1, buffer)
                            .sendToTarget();
                } catch (IOException e) {
                    Log.e(TAG, "disconnected", e);
                    connectionLost();
                    break;
                }
            }
        }

        /**
         * Write to the connected OutStream.
         * @param buffer  The bytes to write
         */
        public void write(CardResource buffer) {
            try {
                mmObjOutStream.writeObject(buffer);
                System.out.println("Reached here at least........");
                // Share the sent message back to the UI Activity
                mHandler.obtainMessage(GameboardResourceActivity.MESSAGE_WRITE, -1, -1, buffer)
                        .sendToTarget();
            } catch (IOException e) {
                Log.e(TAG, "Exception during write", e);
            }
        }

        public void cancel() {
            try {
                mmSocket.close();
            } catch (IOException e) {
                Log.e(TAG, "close() of connect socket failed", e);
            }
        }
    }

Answer 1

你必须知道你的应用程序协议(protocol)是什么才能理解它。听起来另一端正在使用序列化，您需要阅读它。请参阅 ObjectOutputStream 和 ObjectInputStream 的 Javadoc。如果这个假设正确的话，你需要的是 ObjectInputStream.readObject() 。如果不是，您只需找出他们向您发送的内容并进行相应操作，可能使用 DataInputStream 来处理各种数据类型。