一、md5验证

import hashlib m=hashlib.md5() m.update(b"test") print (m.hexdigest()) 结果：098f6bcd4621d373cade4e832627b4f6 二、客户端代码 　　

#客户端 import socket client=socket.socket() #生成socket连接对象 client.connect(("localhost",6969)) while True:  msg=input(">>>:")     if not msg:         continue     if msg.startswith("get"):         client.send(msg.encode("utf-8")) #发送命令到服务端 ；         cmd_res_size=client.recv(1024) #接收文件的大小；         print ("文件大小为：",cmd_res_size)         client.send(b"ready to recv file..")         cmd_size=0         cmd_data=b''         filename=msg.split()[1]         f=open(filename+".new","wb")         while cmd_size!=int(cmd_res_size.decode()):             data=client.recv(1024)             cmd_size+=len(data)             f.write(data)         else:             print ("cmd received done !",cmd_size)             print (cmd_data.decode())         f.close() client.close()

三、服务端 　　

#服务端 import socket,os so_server=socket.socket() so_server.bind(("localhost",6969)) so_server.listen() print ("等电话!") while True: #实现多个链路连接；     conn,addr=so_server.accept()     print ("new connect",addr)     while True:         print ("等待新指令!")         data = conn.recv(1024)         if not data:             print("客户端已经断开")             break         cmd,filename=data.decode().split()         if os.path.isfile(filename):             f=open(filename,"rb")             file_size=str(os.stat(filename).st_size)             print (file_size.encode())             conn.send(file_size.encode())             conn.recv(1024) #wait for ack;             for line in f:                 conn.send(line)             f.close() so_server.close()

8.文件md5较验.