#ftp_serverimport socketimport structimport jsonimport osimport hashlibserver=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 

　　

#ftp_clientimport socketimport structimport osimport jsonimport hashlibclient=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()