在服务器上从android应用接收的数据始终为null

Question

I am trying to connect from a android emulator to a application on my desktop and send a line of text. My app is able to connect to the server, but when ever i try to read data its always null

Server application running on my desktop:

ServerSocket ss = new ServerSocket(9001);
Socket cs = ss.accept();
if (cs.isConnected()) {
    System.out.println("Client connected.");
}

BufferedReader reader = new BufferedReader(new InputStreamReader(cs.getInputStream()));

String str = reader.readLine();
System.out.println("Data:" + str);

Client application running in android app emulator:

    InetAddress addr = InetAddress.getByName("10.0.2.2");
    Socket socket = new Socket(addr, 9001);

    if (socket.isConnected()) {
        Log.d("APP", "socket connected");
    }

    PrintWriter pw = new PrintWriter(new OutputStreamWriter(socket.getOutputStream()));
    String str = "this is a sample";
    pw.write(str);

I can see that the isConnected function of the socket on both the client and server turns true. But the Data printed on the server is always null.

Thanks

Answer 1

尝试在“ pw.write（str）”语句之后添加刷新调用：

pw.flush();