simple_server.py

import socket

def start_server():
    host = "localhost"
    port = 9000 # 一般要大于5000

    server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

    server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

    server_socket.bind(host, port)

    server_socket.listen(5)

    print("Server is running and waiting for connection.")

    try:
        while True:
            client_socket, ip_add = server_socket.accept()
            print("Client connected.")

            message = client_socket.recv(1024).decode()

            print("Client says: ", message)

            response = "Message received by server."
            client_socket.sendall(response.encode())

            client_socket.close()

    except KeyboardInterrupt:
        print("Shutting down server.")

    finally:
        server_socket.close()

if __name__ == "__main__":
    start_server()