python第37天小练习

作业：
编写cs架构的软件，实现客户端可以下载服务端的文件，如图片、视频、文本等

选做：
1、实现上传功能
2、服务端支持并发
3、阿里云服务器应用

服务端：

from socket import *
import subprocess
import struct


phone=socket(AF_INET,SOCK_STREAM) 
phone.setsockopt(SOL_SOCKET,SO_REUSEADDR,1) 
phone.bind(('127.0.0.1',808)) 
phone.listen(5) 

while True:
    conn,client_addr=phone.accept()
    while True:
        try:
            data=conn.recv(1024) 
            if len(data) == 0:
                break
            data = data.decode('utf-8')
		   print("需要下载的文件地址：\n",data.decode('utf-8'))
            cmd, file = data.split(' ',1)
            if cmd == 'get':
                try:
                    with open(file,'rb') as f:
                        data = f.read()
                    conn.send(struct.pack('i',len(data))+data)
                except Exception:
                    conn.send('路径不存在'.encode('utf-8'))
            else:
                conn.send('命令不正确'.encode('utf-8'))
        except Exception:
            break

    conn.close()

客户端：

import socket
import struct

phone=socket.socket(socket.AF_INET,socket.SOCK_STREAM) 
phone.connect(('127.0.0.1',8080)) 
print('=====下载数据=====')
while True:
    msg=input("请输入下载地址>>>: ").strip()
    if len(msg) == 0:continue
    msg,file = msg.rsplit(' ',1)
    phone.send(msg.encode('utf-8'))
    top = phone.recv(4)
    top_len = struct.unpack('i',top)
    print(top_len)
    total_size = 0
    try:
        with open(file,'wb') as f:
            while total_size < top_len[0]:
                recv_data=phone.recv(1024)
                f.write(data)
                total_size += len(recv_data)
            print('下载成功！')
    except Exception:
        print('保存路径不存在')

phone.close()