python使用socket实现的传输demo示例【基于TCP协议】

import socketdef main():  tcp_client_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)  # 服务器位于本机 9999  tcp_client_socket.connect( ("192.168.27.72", 9999) )  # 告诉服务器，我要下载哪一个文件  file_name = input("请输入要下载的文件名:")  tcp_client_socket.send(file_name.encode("utf-8"))  temp = tcp_client_socket.recv(1024)  print(temp)  file_length = int(temp.decode("utf-8"))  # 接收数据 字节  recv_data = tcp_client_socket.recv(file_length)  # 得到数据，需要将数据写入文件  if recv_data:    # f = open("new_" + file_name, "wb")    # try:    #   f.write(recv_data)    # except Exception as result:    #   print("写入文件错误")    # finally:    #   f.close()    with open("new_" + file_name, "wb") as f:      f.write(recv_data)  tcp_client_socket.close()if __name__ == '__main__':  main()

import socketdef main():  #1创建套接字  tcp_server_socket = socket.socket(socket.AF_INET,socket.SOCK_STREAM)  #2绑定本地信息bind  tcp_server_socket.bind(('',9999))  #3让默认的套接字由主动变为被动listen ????  tcp_server_socket.listen(128)  #4等待别人的电话到来（等待客户端的链接 accept）  new_client_socket, client_addr = tcp_server_socket.accept()  #5调用发送文件函数，完成为客户端服务  rece_data = new_client_socket.recv(1024)  file_name = rece_data.decode('utf-8')  try:    f = open(file_name, 'rb')    content = f.read()    file_length = len(content)    print(file_length)    new_client_socket.send(str(file_length).encode('utf-8'))   #????1两个发送第二个执行快了怎么办？    new_client_socket.send(content)  except Exception as f:    print('文件打开失败')  # 6关闭套接字  new_client_socket.close()  tcp_server_socket.close()if __name__ == '__main__':  main()