问服务器套接字不能用Java发回数据

EN

try {
    System.out.println("Waiting for a connection...");
    // Start a server
    ServerSocket server = new ServerSocket(3211);
    // Listen for anyone at that port
    Socket socket = server.accept();
    System.out.println("The client has connected!");
    // Get the data being sent in
    DataInputStream inputStream = new DataInputStream(new BufferedInputStream(socket.getInputStream()));
    DataOutputStream ouputStream = new DataOutputStream(socket.getOutputStream());
    // Turn that into UTF-8
    String data = inputStream.readUTF();
    System.out.println("Received " + data);
    ouputStream.writeUTF("Great!");
    System.out.println("Awesome!");
    socket.close();
    inputStream.close();
    ouputStream.close;
    server.close();
    System.out.println("Socket closed\n-----------------------------");
}
catch(IOException e) {
    System.out.println(e);
}

try {
    allMessagesTextBox.setText(allMessagesTextBox.getText() + "\nConnecting to the server...");
    Socket socket = new Socket("192.168.1.206", 3211);
    allMessagesTextBox.setText(allMessagesTextBox.getText() + "\nConnected to the server!");
    DataInputStream input = new DataInputStream(System.in);
    DataOutputStream output = new DataOutputStream(socket.getOutputStream());
    output.writeUTF("sweet");
    String data = input.readUTF();
    allMessagesTextBox.setText(allMessagesTextBox.getText() + "\nSERVER: " + data);
    input.close();
    output.close();
    socket.close();

}
catch (IOException er) {
    allMessagesTextBox.setText(allMessagesTextBox.getText() + "\n" + er);
}