python实现ftp上下传，支持断点续传。

#!/usr/bin/python#encoding=utf-8 from ftplib import FTP   import sys   import os.path   

#Ftp的类实现

     class MyFTP(FTP):       '''     conncet to FTP Server     '''       def __init__(self):         print 'make a object'     def ConnectFTP(self,remoteip,remoteport,loginname,loginpassword):           ftp=MyFTP()          try:             ftp.connect(remoteip,remoteport,600)             print 'success'         except Exception, e:            print >> sys.stderr, "conncet failed1 - %s" % e            return (0,'conncet failed')           else:               try:                   ftp.login(loginname,loginpassword)                   print('login success')            except Exception, e:                print >>sys.stderr, 'login failed - %s' % e                return (0,'login failed')               else:                print 'return 1'                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 >>sys.stderr, 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])   # change remote work dir        remotefile=dires[1]     # remote file name        print dires[0]+' '+ dires[1]           fsize=ftp.size(remotefile)           if fsize==0 : # localfime's site is 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 * 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),            print '\n','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        print('rsize : %d, lsize : %d' % (rsize, lsize))        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=''            try:                print(remote[1])                datasock,esize=ftp.ntransfercmd("STOR "+remote[1],rsize)            except Exception, e:                print >>sys.stderr, '----------ftp.ntransfercmd-------- : %s' % e                return            cmpsize=rsize            while True:                buf=localf.read(1024 * 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:])#下面是使用代码ftpClient = MyFTP();ftpClient.download('10.61.101.151',21,'test','test','/home/test/X86_GDB','D:\Pmp\X86_GDB');ftpClient.upload('10.61.101.151',21,'test','test','/home/test/123','D:\Pmp\g123');