python 开发的通过FTP上传下载文件类

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　　前段时间使用java写了一个支持断点续传的FTP类库，但是这个库在使用过程中还是有点问题，最近在学习python，就打算用python写一个。
　　其实在使用java写的那个过程中也遇到了一些比较难解决的问题，比如说在多个ftp客户端同事向一个FTP服务器端发送上传命令，这个时候会造成线程挂起不会抛异常也不会退出，这个让我头疼的好久，现在用python写了一个，
　　目前更改的类主要实现的断点下载和断点上传，欢迎大家批评指正。

#!/usr/bin/env python
# -*- coding: gbk -*-
from ftplib import FTP
import sys
import os.path
class MyFTP(FTP):
'''
conncet to FTP Server
'''
def ConnectFTP(self,remoteip,remoteport,loginname,loginpassword):
ftp=MyFTP()
try:
ftp.connect(remoteip,remoteport)
except:
return (0,'conncet failed')
else:
try:
ftp.login(loginname,loginpassword)
except:
return (0,'login failed')
else:
return (1,ftp)
def download(self,remoteHost,remotePort,loginname,loginpassword,remotePath,localPath):
#connect to the FTP Server and check the return
res = self.ConnectFTP(remoteHost,remotePort,loginname,loginpassword)
if(res[0]!=1):
print res[1]
sys.exit()
#change the remote directory and get the remote file size
ftp=res[1]
ftp.set_pasv(0)
dires = self.splitpath(remotePath)
if dires[0]:
ftp.cwd(dires[0])
remotefile=dires[1]
print dires[0]+' '+ dires[1]
fsize=ftp.size(remotefile)
if fsize==0 :
return
#check local file isn't exists and get the local file size
lsize=0L
if os.path.exists(localPath):
lsize=os.stat(localPath).st_size
if lsize >= fsize:
print 'local file is bigger or equal remote file'
return
blocksize=1024
cmpsize=lsize
ftp.voidcmd('TYPE I')
conn = ftp.transfercmd('RETR '+remotefile,lsize)
lwrite=open(localPath,'ab')
while True:
data=conn.recv(blocksize)
if not data:
break
lwrite.write(data)
cmpsize+=len(data)
print '\b'*30,'download process:%.2f%%'%(float(cmpsize)/fsize*100),
lwrite.close()
ftp.voidcmd('NOOP')
ftp.voidresp()
conn.close()
ftp.quit()
def upload(self,remotehost,remoteport,loginname,loginpassword,remotepath,localpath,callback=None):
if not os.path.exists(localpath):
print "Local file doesn't exists"
return
self.set_debuglevel(2)
res=self.ConnectFTP(remotehost,remoteport,loginname,loginpassword)
if res[0]!=1:
print res[1]
sys.exit()
ftp=res[1]
remote=self.splitpath(remotepath)
ftp.cwd(remote[0])
rsize=0L
try:
rsize=ftp.size(remote[1])
except:
pass
if (rsize==None):
rsize=0L
lsize=os.stat(localpath).st_size
if (rsize==lsize):
print 'remote filesize is equal with local'
return
if (rsize<lsize):
localf=open(localpath,'rb')
localf.seek(rsize)
ftp.voidcmd('TYPE I')
datasock,esize=ftp.ntransfercmd("STOR "+remote[1],rsize)
cmpsize=rsize
while True:
buf=localf.read(1024)
if not len(buf):
print '\rno data break'
break
datasock.sendall(buf)
if callback:
callback(buf)
cmpsize+=len(buf)
print '\b'*30,'uploading %.2f%%'%(float(cmpsize)/lsize*100),
if cmpsize==lsize:
print '\rfile size equal break'
break
datasock.close()
print 'close data handle'
localf.close()
print 'close local file handle'
ftp.voidcmd('NOOP')
print 'keep alive cmd success'
ftp.voidresp()
print 'No loop cmd'
ftp.quit()

def splitpath(self,remotepath):
position=remotepath.rfind('/')
return (remotepath[:position+1],remotepath[position+1:])

if __name__=='__main__':
lf = MyFTP()
lf.download('127.0.0.1',21,'test','123456','/media/purecore.exe','F:\\Downloads\\software\\PureCodectemp.exe')