java - Android 2-Way TCP/IP ServerSocket/套接字通信

Question

使用这个 great tutorial通过 Java Code Geeks，我可以很容易地创建一个客户端 Activity ，使用以下代码通过 TCP 将数据发送到服务器的端口 4000:

public class Client extends Activity {

private Socket socket;

private static final int SERVERPORT = 5000;
private static final String SERVER_IP = "10.0.2.2";

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);      

    new Thread(new ClientThread()).start();
}

public void onClick(View view) {
    try {
        EditText et = (EditText) findViewById(R.id.EditText01);
        String str = et.getText().toString();
        PrintWriter out = new PrintWriter(new BufferedWriter(
                new OutputStreamWriter(socket.getOutputStream())),
                true);
        out.println(str);
    } catch (UnknownHostException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

class ClientThread implements Runnable {

    @Override
    public void run() {

        try {
            InetAddress serverAddr = InetAddress.getByName(SERVER_IP);

            socket = new Socket(serverAddr, SERVERPORT);

        } catch (UnknownHostException e1) {
            e1.printStackTrace();
        } catch (IOException e1) {
            e1.printStackTrace();
        }

    }

}
}

然后将他们的其他 fragment 用于服务器 Activity ，我可以在该端口上使用 TCP 捕获消息:

public class Server extends Activity {

private ServerSocket serverSocket;

Handler updateConversationHandler;

Thread serverThread = null;

private TextView text;

public static final int SERVERPORT = 6000;

@Override
public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    text = (TextView) findViewById(R.id.text2);

    updateConversationHandler = new Handler();

    this.serverThread = new Thread(new ServerThread());
    this.serverThread.start();

}

@Override
protected void onStop() {
    super.onStop();
    try {
        serverSocket.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

class ServerThread implements Runnable {

    public void run() {
        Socket socket = null;
        try {
            serverSocket = new ServerSocket(SERVERPORT);
        } catch (IOException e) {
            e.printStackTrace();
        }
        while (!Thread.currentThread().isInterrupted()) {

            try {

                socket = serverSocket.accept();

                CommunicationThread commThread = new CommunicationThread(socket);
                new Thread(commThread).start();

            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

class CommunicationThread implements Runnable {

    private Socket clientSocket;

    private BufferedReader input;

    public CommunicationThread(Socket clientSocket) {

        this.clientSocket = clientSocket;

        try {

            this.input = new BufferedReader(new InputStreamReader(this.clientSocket.getInputStream()));

        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void run() {

        while (!Thread.currentThread().isInterrupted()) {

            try {

                String read = input.readLine();

                updateConversationHandler.post(new updateUIThread(read));

            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

}

class updateUIThread implements Runnable {
    private String msg;

    public updateUIThread(String str) {
        this.msg = str;
    }

    @Override
    public void run() {
        text.setText(text.getText().toString()+"Client Says: "+ msg + "\n");
    }
}
}

我的问题是我怎样才能让这 2 个可以来回通信？

Android -> Server(4000) -> Android(4001)?

换句话说，我如何让我的应用程序帮助设备同时充当客户端(向端口 4000 上的另一台设备发送数据)和服务器(在端口 4001 上监听数据)？

Answer 1

在服务器端将端口更改为 5000(与客户端相同)而不是 6000:

并且您需要更新以下类，因为您不想创建新套接字，您应该使用已经创建的套接字(在客户端部分)。注意:作为 CommunicationThread 参数给出的套接字是您应该已经创建的套接字(客户端部分)。

class ServerThread implements Runnable {

public void run() {
    while (!Thread.currentThread().isInterrupted()) {
            CommunicationThread commThread = new CommunicationThread(socket);
            new Thread(commThread).start();

        }
    }
}