对python这个高级语言感兴趣的小伙伴，下面一起跟随编程之家 jb51.cc的小编两巴掌来看看吧！

访问FTP，无非两件事情：upload和download，最近在项目中需要从ftp下载大量文件，然后我就试着去实验自己的ftp操作类，如下(PS：此段有问题，别复制使用，可以参考去试验自己的ftp类！)

# @param Python之FTP传输

# @author 编程之家 jb51.cc|jb51.cc

import os

from ftplib import FTP

class FTPSync():

def __init__(self,host,usr,psw,log_file):

self.host = host

self.usr = usr

self.psw = psw

self.log_file = log_file

def __ConnectServer(self):

try:

self.ftp = FTP(self.host)

self.ftp.login(self.usr,self.psw)

self.ftp.set_pasv(False)

return True

except Exception:

return False

def __CloseServer(self):

try:

self.ftp.quit()

return True

except Exception:

return False

def __CheckSizeEqual(self,remoteFile,localFile):

try:

remoteFileSize = self.ftp.size(remoteFile)

localFileSize = os.path.getsize(localFile)

if localFileSize == remoteFileSize:

return True

else:

return False

except Exception:

return None

def __DownloadFile(self,localFile):

try:

self.ftp.cwd(os.path.dirname(remoteFile))

f = open(localFile,'wb')

remoteFileName = 'RETR ' + os.path.basename(remoteFile)

self.ftp.retrbinary(remoteFileName,f.write)

if self.__CheckSizeEqual(remoteFile,localFile):

self.log_file.write('The File is downloaded successfully to %s' + '\n' % localFile)

return True

else:

self.log_file.write('The localFile %s size is not same with the remoteFile' + '\n' % localFile)

return False

except Exception:

return False

def __DownloadFolder(self,remoteFolder,localFolder):

try:

fileList = []

self.ftp.retrlines('NLST',fileList.append)

for remoteFile in fileList:

localFile = os.path.join(localFolder,remoteFile)

return self.__DownloadFile(remoteFile,localFile)

except Exception:

return False

def SyncFromFTP(self,localFolder):

self.__DownloadFolder(remoteFolder,localFolder)

self.log_file.close()

self.__CloseServer()

# End www.jb51.cc