【下载文档:  编写Python脚本来实现最简单的FTP下载的教程.txt 】

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编写Python脚本来实现最简单的FTP下载的教程
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！）
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, remoteFile, 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, remoteFolder, localFolder):
self.__DownloadFolder(remoteFolder, localFolder)
self.log_file.close()
self.__CloseServer()