Resolver el problema de congestión y ejercicios concurrentes.

Servidor

import socketserver 
import struct 
import json 

class MyRequestHandle (socketserver.BaseRequestHandler): 
    def handle (self): 
        print (self.client_address) 
        while True: 
            try: 
                cmd = self.request.recv (1024) 

                if len (cmd) == 0: descanso 
                de impresión (cmd.decode ( 'utf-8')) 
                con abierto (cmd, modo = 'rb') como f: 
                    file = f.read () 

                TOTAL_SIZE = len (archivo) 

                = header_dic { 
                    "TOTAL_SIZE": TOTAL_SIZE, 
                    "md5": "123123xi12ix12" 
                }

                json_str = json.dumps (header_dic) 
                json_str_bytes = json_str.encode ('gbk') 

                x = struct.pack ('i', len (json_str_bytes)) 
                self.request.send (x) 

                self.request.send (json_str_bytes) 
                self .request.send (file) 

            excepto Exception: 
                break 
        self.request.close () 

s = socketserver.ThreadingTCPServer (('127.0.0.1', 8080), MyRequestHandle) 
s.serve_forever ()

Cliente

import struct 
import json 
import os 
from socket import * 

client = socket (AF_INET, SOCK_STREAM) 
client.connect (('127.0.0.1', 8080)) 

while True: 
    cmd = input ('请 输入 需要 下载 的 文件 地址 >> ： ') .strip () 
    si no es os.path.exists (cmd): 
        continuar 
    client.send (cmd.encode (' utf-8 ')) 
    x = client.recv (4) 
    header_len = struct.unpack (' i ' , x) [0] 
    print (header_len) 

    json_str_bytes = client.recv (header_len) 
    json_str = json_str_bytes.decode ('utf-8') 
    header_dic = json.loads (json_str) 
    print (header_dic) 
    total_size = header_dic ["total_size"] 

    recv_size = 0 
    mientras recv_size <tamaño total:
        recv_data = client.recv (1024) 
        recv_size + = len (recv_data) 
        file = recv_data 
        choice = cmd.rsplit ('.', 1) [1] 
        if choice == 'jpg': 
            with open (r'C: \ Users \ dell \ Desktop \ python14 \ day37 \ code \ download file \ copy.jpg ', mode =' ab ') como f: 
                f.write (file) 
                continue 
        elif choice ==' txt ': 
            con open (r'C: \ Users \ dell \ Desktop \ python14 \ day37 \ code \ download file \ job.txt ', mode =' ab ') como f: 
                f.write (file) 
                continue 
        elif choice ==' mp4 ': 
            con open (r 'C: \ Users \ dell \ Desktop \ python14 \ day37 \ code \ download file \ copy.mp4', mode = 'ab') como f: 
                f.escribir (archivo) 
                continuar
    más: 
        print ()