网络编程FTP

#ftp_server
import socket
import struct
import json
import os
import hashlib


server=socket.socket()
server.bind(('192.168.15.50',8000))
server.listen(5)
while 1:
    print('sever is working.......')
    conn,addr=server.accept()
    while 1:
        file_info_length_pack=conn.recv(4)
        file_info_length=struct.unpack('i',file_info_length_pack)[0]

        file_info_json=conn.recv(file_info_length).decode('utf-8')
        file_info=json.loads(file_info_json)

        action=file_info.get('action')
        file_name=file_info.get('file_name')
        file_size=file_info.get('file_size')

        md5=hashlib.md5()
        with open('put/'+file_name,mode='wb')as f:
            recv_data_length=0
            while recv_data_length <file_size:#file_size是文件总字节长度,recv_data_length是字节长度
                data=conn.recv(1024)
                recv_data_length+=len(data)
                f.write(data)
                md5.update(data)
                print('文件总长度大小为:%s,已经接受了%s'%(file_size,recv_data_length))
            else:
                print('文件上传成功')
                conn.send('OK'.encode('utf-8'))


        recv_md5=conn.recv(1024).decode('utf-8')
        if recv_md5==md5.hexdigest():
            print('经对比文件传输无误,OK')
            conn.send('OK'.encode('utf-8'))
            break

　　

#ftp_client

import socket
import struct
import os
import json
import hashlib

client=socket.socket()
client.connect(('192.168.15.50',8000))
while 1:
  cmd=input("请输入命令").strip()
  action,file_name=cmd.split(' ')

  file_size=os.path.getsize(file_name)

  file_info={
      'action':action,
      'file_name':file_name,
      'file_size':file_size
  }

  file_info_json=json.dumps(file_info).encode('utf-8')

  ret=struct.pack('i',len(file_info_json))
  client.send(ret)

  client.send(file_info_json)


  md5=hashlib.md5()
  with open(file_name,mode='rb')as f:
      for line in f:
          client.send(line)
          md5.update(line)
      response1=client.recv(1024).decode('utf-8')
      if response1=='OK':
          print('上传完成')

  client.send(md5.hexdigest().encode('utf-8'))
  response2=client.recv(1024).decode('utf-8')
  if response2=='OK':
      print('经对比文件传输无误')
      break
  else:
      print('传输过程中,文件改变,请重新传输')


client.close()