java - 服务器发送消息给客户端

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我正在开发一个使用 TCP/IP 的 Android 应用程序。我可以轻松地将消息从服​​务器发送到客户端，但我可以弄清楚如何从服务器向客户端发送消息。我环顾四周，找不到答案。它只是某种输出编写器吗？

Public class MainActivity 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("");
        if (msg != null){
            text.setText(text.getText().toString()+"binary message sent: "+ msg + "\n");
            String[] list_bin = new String[list_command.length];

            for(int i=0 ; i<list_command.length; i++){
                list_bin[i] = Integer.toBinaryString(i);                   
                if ( list_bin[i] == null ? msg == null : list_bin[i].equals(msg)){
                    msg = list_command[i];
                }
            }

            text.setText(text.getText().toString()+"Found input : "+ msg + "\n");
        }
    }
}

如何让服务器向客户端发送消息？

Answer 1

最简单的方法是在 clientSocket.getOutputStream 上使用 OutputStreamWriter，并从单独的线程写入。