java socket demo

public class ServerSocketTest {

    public static void main(String[] args) {
        try {
            ServerSocket serverSocket = new ServerSocket(9999);
            ExecutorService executorService = Executors.newFixedThreadPool(10);
            while (true) {
                final Socket socket = serverSocket.accept();
                Thread thread = new Thread(new Runnable() {
                    @Override
                    public void run() {
                        try {
                            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
                            String str;
                            while ((str = bufferedReader.readLine()) != null) {
                                System.out.println(str);
                            }
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                    }
                });
                executorService.execute(thread);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

public class ClientSocketTest {
    public static void main(String[] args) {
        try {
            Socket socket = new Socket("localhost", 9999);
            BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(), "UTF-8"));
            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in, "UTF-8"));

            String str;
            while ((str = bufferedReader.readLine()) != null) {
                bufferedWriter.write(str);
                bufferedWriter.write("\n");
                bufferedWriter.flush();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}