Android中仅客户端编程的套接字

我想打开一个TCP连接，以将数据发送到android应用程序中的ip地址。我发现的每个套接字编程文章/线程都同时显示客户端和服务器端代码（通常是聊天程序）。是否可以仅在Android设备上运行客户端代码，然后将任意数据发送到例如Google的IP地址？现在我正在使用此线程（最高支持的答案）中的代码（Android客户端套接字），如何读取数据？在扩展AsynchTask的类中，如下所示：

public class InternetTask extends AsyncTask<Void, Integer, Void> {
    public static final int BUFFER_SIZE = 2048;
    private Socket socket = null;
    private PrintWriter out = null;
    private BufferedReader in = null;
    private int port = 80;
    private String host = null;
    private static final String TAG="sure2015test";

    public InternetTask(String host,int port) {
        this.host=host;
        this.port=port;
    }

    @Override
    protected Void doInBackground(Void... args) {


        connectWithServer();
        Log.i(TAG, "Connected");
        sendDataWithString("hello");
        Log.i(TAG, "Sent data");
        String response=receiveDataFromServer();
        Log.i(TAG,response);
        disConnectWithServer();
        return null;
    }


    private void connectWithServer() {
        try {
            if (socket == null) {
                socket = new Socket(this.host, this.port);
                out = new PrintWriter(socket.getOutputStream());
                in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            }
        } catch (IOException e) {
            Log.i(TAG,"IO Exeception");
            e.printStackTrace();
        }
    }

    private void disConnectWithServer() {
        if (socket != null) {
            if (socket.isConnected()) {
                try {
                    in.close();
                    out.close();
                    socket.close();
                } catch (IOException e) {
                    Log.i(TAG,"IO exception disconnecting");
                    e.printStackTrace();
                }
            }
        }
    }

    public void sendDataWithString(String message) {
        if (message != null) {
            connectWithServer();
            out.write(message);
            out.flush();
        }
    }

    public String receiveDataFromServer() {
        try {
            String message = "";
            int charsRead = 0;
            char[] buffer = new char[BUFFER_SIZE];
            Log.i(TAG,"Message before: "+message);
            while ((charsRead = in.read(buffer)) != -1) {
                message += new String(buffer).substring(0, charsRead);
                Log.i(TAG,message);
            }
            Log.i(TAG,"Message after: "+message);
            disConnectWithServer(); // disconnect server
            return message;
        } catch (IOException e) {
            Log.i(TAG,"IO Error in receiving message");
            return "Error receiving response:  " + e.getMessage();
        }
    }
}

还有我在MainActivity.java中的onCreate方法

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    InternetTask task=new InternetTask("74.125.226.159",80);
    task.execute();
}

当我运行它时，我在日志中得到了这个：

05-16 00:01:04.368      622-637/? I/sure2015test﹕ Connected
05-16 00:01:04.369      622-637/? I/sure2015test﹕ Sent data
05-16 00:01:04.369      622-637/? I/sure2015test﹕ Message before:
05-16 00:03:04.405      622-637/com.example.connorstein.sockethelloworld I/sure2015test﹕ Message after:

因此，使用Google的IP在端口80上打开套接字时也没有例外，发送或接收数据也没有例外。看来我没有回应。这是因为我发送的数据（“ hello”）毫无意义吗？我认为至少我会得到一个响应，说无效请求或类似的内容。我也尝试发送“ GET / HTTP / 1.0”，但也没有响应。