java - 我的应用程序卡在 mBufferIn.readLine() 上

Question

我一直在尝试将消息从服​​务器发送到我的应用程序。我正在使用应用程序“Simple Socket Tester”创建服务器并向应用程序发送 UTF-8 消息。我从未在我的应用程序上收到消息，当我调试应用程序时，它卡在“mServerMessage= mBufferIn.readLine();”行上并且永远无法超越它。所以看来它无法读取消息。当我暂停调试器时，我来到“LocalSocketImpl.java”，它卡在“私有(private) native FileDescriptor 接受”上。我可以做什么来防止这种情况发生？

我的 TCP 客户端:

public TcpClient(OnMessageReceived listener) {
    mMessageListener = listener;

}

/**
 * Sends the message entered by client to the server
 *
 * @param message text entered by client
 */
public void sendMessage(String message) {
    if (mBufferOut != null && !mBufferOut.checkError()) {
        mBufferOut.println(message);
        mBufferOut.flush();
    }
}


/**
 * Close the connection and release the members
 */
public void stopClient() {

    mRun = false;

    if (mBufferOut != null) {
        mBufferOut.flush();
        mBufferOut.close();
    }

    mMessageListener = null;
    mBufferIn = null;
    mBufferOut = null;
    mServerMessage = null;
}

public void run() {

    mRun = true;

    try {
        //here you must put your computer's IP address.
        InetAddress serverAddr = InetAddress.getByName(SERVER_IP);

        Log.e("TCP Client", "C: Connecting...");

        //create a socket to make the connection with the server
        Socket socket = new Socket(serverAddr, SERVER_PORT);

        try {

            //sends the message to the server
            mBufferOut = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())), true);
            sendMessage("hi");

            //receives the message which the server sends back
            mBufferIn = new BufferedReader(new InputStreamReader(socket.getInputStream(),"UTF-8"));



            //in this while the client listens for the messages sent by the server
            while (mRun) {

                mServerMessage = mBufferIn.readLine();
                System.out.println(mServerMessage);

                if (mServerMessage != null && mMessageListener != null) {
                    //call the method messageReceived from MyActivity class
                    mMessageListener.messageReceived(mServerMessage);
                }

            }

            Log.e("RESPONSE FROM SERVER", "S: Received Message: '" + mServerMessage + "'");

        } catch (Exception e) {

            Log.e("TCP", "S: Error", e);

        } finally {
            //the socket must be closed. It is not possible to reconnect to this socket
            // after it is closed, which means a new socket instance has to be created.
        }

    } catch (Exception e) {

        Log.e("TCP", "C: Error", e);

    }

}

//Declare the interface. The method messageReceived(String message) will must be implemented in the MyActivity
//class at on asynckTask doInBackground
public interface OnMessageReceived {
    public void messageReceived(String message);
}

}

Answer 1

您收到的字符串末尾必须有“\n”。 readLine 方法将停止读取或等待流，直到读取“\n”。