校验文件一致性
#客户端

import socket
sk = socket.socket()
sk.connect(('127.0.0.1',8802))

import os

import hmac
u = os.urandom(16)
sk.send(u)
h = hmac.new(b'alex_sb',u)
h = h.digest()
sk.send(h)
print(sk.recv(1024))

#服务端
import socket
sk = socket.socket()
sk.bind(('127.0.0.1',8802))
sk.listen(5)
conn,_ = sk.accept()
u= conn.recv(1024)
import os

import hmac
h = hmac.new(b'alex_sb',u)
h= h.digest()
recv1 = conn.recv(1024)
if recv1 == h:
    conn.send(b'hello')
else:
    conn.close()

2.实现文件上传和下载,以及socketserver模块

#服务端
import socketserver
import struct
import json
class Myserver(socketserver.BaseRequestHandler):
    def handle(self):
          conn = self.request
          while 1:
              try:
                  #把字典字节长度接到后用unpack解压字节长度
                  pack_length = conn.recv(4)
                  length_bytes = struct.unpack('i',pack_length)[0]
                  dic = conn.recv(length_bytes).decode('utf-8')
                  dic_data = json.loads(dic)

                  with open(dic_data['filename'],'wb')as f:
                      while dic_data['filesize'] >0:
                          content = conn.recv(1024)
                          dic_data['filesize'] -= len(content)
                          f.write(content)
              except Exception as e:
                  break
          conn.close()
          print('本次接收完')


server = socketserver.ThreadingTCPServer(('127.0.0.1',8090),Myserver)
server.serve_forever()

#客户端

import socket
import os
import json
import struct
sk = socket.socket()
sk.connect(('127.0.0.1',8090))
print('连接成功')
filename = os.path.basename(r'D:\python-3阶段\day1\day1\1.wmv')
filesize = os.path.getsize(r'D:\python-3阶段\day1\day1\1.wmv')
#把文件名,文件大小写成字典
dic = {'filename':filename,'filesize':filesize}
#用json序列化化成字符串
dic_json = json.dumps(dic)
#转化成字节,并求出字节长度
dic_json_bytes = dic_json.encode('utf-8')
json_bytes_length = len(dic_json_bytes)
#用pack把数字转化成四字节并发送
length_bytes = struct.pack('i',json_bytes_length)
sk.send(length_bytes)
sk.send(dic_json_bytes)
data_length = 0
with open(r'D:\python-3阶段\day1\day1\1.wmv','rb') as f:
        while filesize>0:
            content = f.read(1024)
            filesize -= 1024
            sk.send(content)
sk.close()