Java Socket服务器与Python客户端通信，程序不会输入"inputLine = in.readLine()"-loop

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;

public class Server {
    public static void main(String[] args) {
        try {
            ServerSocket serverSocket = new ServerSocket(8888);
            System.out.println("Server started. Waiting for client...");

            Socket clientSocket = serverSocket.accept();
            System.out.println("Client connected.");

            BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
            String inputLine;

            while ((inputLine = in.readLine()) != null) {
                System.out.println("Received from client: " + inputLine);
            }

            in.close();
            clientSocket.close();
            serverSocket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

import socket

HOST = 'localhost'
PORT = 8888

client_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
client_socket.connect((HOST, PORT))
print("Connected to server.")

while True:
    message = input("Enter message to send: ")
    client_socket.sendall(message.encode())

client_socket.close()