import socket  
  
def start_server(port):  
    # 创建一个socket对象  
    server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)  
      
    # 绑定到指定的IP地址和端口  
    # 如果你想监听所有可用的网络接口，可以使用空字符串('')作为IP地址  
    server_address = ('', port)  
    print(f'Starting up on {server_address[1]}')  
    server_socket.bind(server_address)  
      
    # 开始监听连接  
    server_socket.listen(1)  
      
    while True:  
        # 等待客户端连接  
        print('Waiting for a connection')  
        connection, client_address = server_socket.accept()  
          
        try:  
            print(f'Connection from {client_address}')  
              
            # 接收数据，最多1024字节  
            while True:  
                data = connection.recv(1024)  
                print(f'Received {len(data)} bytes from {client_address}')  
                  
                if not data:  
                    break  
                  
                # 向客户端发送数据  
                connection.sendall(data)  
                  
        finally:  
            # 清理连接  
            connection.close()  
  
if __name__ == '__main__':  
    port = 8123  # 你可以更改为你想要的端口号  
    start_server(port)