python video tutorial column introduces efficient methods to achieve file transfer.

#The effect achieved is shown in the following Gif, which is the network communication Socket module to realize file download and transmission.

Server

First you need to obtain the local IP. Here the server uses a multi-threading method, which is to define a function and then use threading to create a task. The client connects successfully and receives the client's request information, which is the downloaded file name. So it needs to be judged whether there is the number of bytes in the output file. Then ask the user if he wants to download, and use while True: to read the content of the file after getting the information, and then send. Look at the code to see if that's what's going on.

import socketimport osimport threading# 获取本机ipdef get_host_ip():    try:        s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)        s.connect(('8.8.8.8', 80))        ip = s.getsockname()[0]
    finally:        s.close()    return ip# 处理客户端请求下载文件的操作（从主线程提出来的代码）def deal_client_request(ip_port, service_client_socket):
    # 连接成功后，输出“客户端连接成功”和客户端的ip和端口    print("客户端连接成功", ip_port)
    # 接收客户端的请求信息【recv】    file_name = service_client_socket.recv(1024)
    # 解码    file_name_data = file_name.decode("utf-8")
    # 判断文件是否存在    if os.path.exists(file_name_data):
        #输出文件字节数        fsize = os.path.getsize(file_name_data)
        #转化为兆单位        fmb = fsize/float(1024*1024)
        #要传输的文件信息        senddata = "文件名：%s  文件大小：%.2fMB"%(file_name_data,fmb)
        #发送和打印文件信息【send】        service_client_socket.send(senddata.encode("utf-8"))        print("请求文件名：%s  文件大小：%.2f MB"%(file_name_data,fmb))
        #接受客户是否需要下载【recv】        options = service_client_socket.recv(1024)        if options.decode("utf-8") == "y":
            # 打开文件            with open(file_name_data, "rb") as f:
                #　计算总数据包数目                nums = fsize/1024
                #　当前传输的数据包数目                cnum = 0                while True:                    file_data = f.read(1024)                    cnum = cnum + 1                    #progress = cnum/nums*100                    #print("当前已下载：%.2f%%"%progress,end = "\r")                    if file_data:
                        # 只要读取到数据，就向客户端进行发送【send】                        service_client_socket.send(file_data)
                    # 数据读完，退出循环                    else:                        print("请求的文件数据发送完成")                        break
        else:            print("下载取消！")    else:        print("下载的文件不存在！")
    # 关闭服务当前客户端的套接字【close】    service_client_socket.close()if __name__ == '__main__':
    # 获取本机ip
    print("TCP文件传输服务器，本机IP:" + get_host_ip())
    
    # 把工作目录切换到data目录下    os.chdir("./data")
    # 创建套接字【socket】    tcp_server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    # 绑定端口号【bind】    tcp_server_socket.bind(("", 3356))
    # 设置监听，将主动套接字变为被动套接字【listen】    tcp_server_socket.listen(128)

    # 循环调用【accept】，可以支持多个客户端同时连接，和多个客户端同时下载文件    while True:        service_client_socket, ip_port = tcp_server_socket.accept()
        # 连接成功后打印套接字号        #print(id(service_client_socket))

        # 创建子线程        sub_thread = threading.Thread(target=deal_client_request, args=(ip_port, service_client_socket))
        # 启动子线程        sub_thread.start()复制代码

Client

The client is simpler. It connects to the server, sends a request to download the file, and defines a folder to be written. It is just childish stuff. No more writing, just look at the code.

# -*- coding:utf-8 -*-# 多任务文件下载器客户端import socketimport osif __name__ == '__main__':
    # 创建套接字【socket】    tcp_client_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    # 和服务端连接【connect】    server_ip = input("输入服务器IP：")    tcp_client_socket.connect((server_ip, 3356))
    # 发送下载文件的请求    file_name = input("请输入要下载的文件名：")
    # 编码    file_name_data = file_name.encode("utf-8")
    # 发送文件下载请求数据【send】    tcp_client_socket.send(file_name_data)
    # 接收要下载的文件信息【recv】    file_info = tcp_client_socket.recv(1024)
    # 文件信息解码    info_decode = file_info.decode("utf-8")    print(info_decode)
    #获取文件大小    fileszie = float(info_decode.split('：')[2].split('MB')[0])    fileszie2 = fileszie*1024
    # 是否下载？输入ｙ　确认　输入ｑ 取消    opts = input("是否下载？(y 确认　q 取消)")    if opts == 'q':        print("下载取消！程序退出")    else:        print("正在下载　>>>>>>")
        #向服务器确认正在下载【send】        tcp_client_socket.send(b'y')        recvpath = "./receive/"        if not os.path.exists(recvpath):            os.mkdir(recvpath) 
        
        # 把数据写入到文件里        with open(recvpath + file_name, "wb") as file:
            #目前接收到的数据包数目            cnum = 0            while True:
                # 循环接收文件数据【recv】                file_data = tcp_client_socket.recv(1024)
                # 接收到数据                if file_data:
                    # 写入数据                    file.write(file_data)                    cnum = cnum+1                    #progress =cnum/fileszie2*100                    #print("当前已下载：%.2f%%"%progress,end = "\r")
                # 接收完成                else:                    print("下载结束！")                    break
    # 关闭套接字【close】    tcp_client_socket.close()复制代码

Extension

If the mobile phone wants to download files on the computer (between the computer and the mobile phone), you need to ensure that the network connected to the computer and mobile phone is under the same router

View ip through ipconfig

Command line inputpython -m http.server 8888 to build a local area network

Mobile phone access192.168 .0.101:8888You can download the file

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