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！）
importos
fromftplibimportFTP
classFTPSync():
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)
returnTrue
exceptException:
returnFalse
def__CloseServer(self):
try:
self.ftp.quit()
returnTrue
exceptException:
returnFalse
def__CheckSizeEqual(self,remoteFile,localFile):
try:
remoteFileSize=self.ftp.size(remoteFile)
localFileSize=os.path.getsize(localFile)
iflocalFileSize==remoteFileSize:
returnTrue
else:
returnFalse
exceptException:
returnNone
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)
ifself.__CheckSizeEqual(remoteFile,localFile):
self.log_file.write('TheFileisdownloadedsuccessfullyto%s'+'\n'%localFile)
returnTrue
else:
self.log_file.write('ThelocalFile%ssizeisnotsamewiththeremoteFile'+'\n'%localFile)
returnFalse
exceptException:
returnFalse
def__DownloadFolder(self,remoteFolder,localFolder):
try:
fileList=[]
self.ftp.retrlines('NLST',fileList.append)
forremoteFileinfileList:
localFile=os.path.join(localFolder,remoteFile)
returnself.__DownloadFile(remoteFile,localFile)
exceptException:
returnFalse
defSyncFromFTP(self,remoteFolder,localFolder):
self.__DownloadFolder(remoteFolder,localFolder)
self.log_file.close()
self.__CloseServer()
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