python中socket传输demo

socket传输，客户端代码

import socket

def 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()

服务端代码：

import socket

def 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()