通过 TCP 套接字发送消息 - Java

Question

我试图在Android中通过TCP套接字发送消息，但它不起作用。（我的手机是客户端）

下面是来自类 TCPClient 的代码：

public class TcpClient {

    public static String SERVER_IP = "192.168.200.1"; //server IP address

    public static final int SERVER_PORT = 1500;

    // message to send to the server

    private String mServerMessage;

    // sends message received notifications

    private OnMessageReceived mMessageListener = null;

    // while this is true, the server will continue running

    private boolean mRun = false;

    // used to send messages

    private PrintWriter mBufferOut;

    // used to read messages from the server

    private BufferedReader mBufferIn;

    private Socket socket;

    private Context context;

    /**

     * Constructor of the class. OnMessagedReceived listens for the messages received from server

     */

    public TcpClient(OnMessageReceived listener) {

        mMessageListener = listener;

    }

    /**

     * Sends the message entered by client to the server

     *

     * param message text entered by client

     */

    public String sendMessage(String message) {

        byte[] bytesToSend = message.getBytes();

        if (bytesToSend != null && socket != null && socket.isConnected()) {

            try {

                socket.getOutputStream().write(bytesToSend, 0, 9);

                return "deu";

            } catch (Exception e2) {

                e2.printStackTrace();

                return e2.getMessage();

            }

        }

        else return "aa";

    }

    /**

     * Close the connection and release the members

     */

    public void stopClient() {

        sendMessage("disconnecting");

        mRun = false;

        if (mBufferOut != null) {

            mBufferOut.flush();

            mBufferOut.close();

        }

        mMessageListener = null;

        mBufferIn = null;

        mBufferOut = null;

        mServerMessage = null;

    }

Answer 1

无需为你的英语感到抱歉！它完全没:)android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1598)当您的应用程序尝试在主线程上执行任何网络操作时，将引发上述错误。您可以使用下面的代码强制操作或创建单独的线程并执行操作。备选案文1：强迫    int SDK_INT = android.os.Build.VERSION.SDK_INT;    if (SDK_INT > 8)     {        StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()                .permitAll().build();        StrictMode.setThreadPolicy(policy);        //your codes here    }选项 2：单独的螺纹Thread thread = new Thread(new Runnable() {            @Override            public void run() {                // do something in here            }        });thread.start();