使用Python批量下载ftp服务器中的内容

使用ftplib，轻松实现从ftp服务器上下载所需要的文件，包括目录结构等，支持了一下断点续传

 from ftplib import FTP
 import sys
 import os
 import re

 def ftpconnet(ftpserver,port,username,password):
     ftp = FTP()
     try:
         ftp.connect(ftpserver,port)
     except:
         raise IOError,'FTP connect failed!'

     try:
         ftp.login(username,password)
     except:
         raise IOError,'FTP login failed!'
     else:
         return ftp

 def ftpdownload(ftp,ori_path,dest_path):
     for each in ftp.nlst(ori_path):
         try:
             ftp.cwd(each)
         except:
             filename = re.search('\S+\/(\S+)',each).group(1)
             local_file = dest_path + '/' + filename
             if os.path.exists(local_file):
                 lsize = os.stat(local_file).st_size
                 rsize = ftp.size(each)
                 if lsize > rsize:
                     sys.stderr.write('the local file %s is bigger than the remote!\n'%local_file)
                     return False
                 elif lsize == rsize:
                     sys.stderr.write('the file %s has been completed!\n'%local_file)
                 bufsize = 1024 * 1024
                 fp = open(local_file,'ab')
                 ftp.retrbinary('RETR '+each,fp.write,bufsize,rest=lsize)
             else:
                 bufsize = 1024 * 1024
                 fp = open(local_file,'wb')
                 ftp.retrbinary('RETR '+each,fp.write,bufsize)
         else:
             dirname = re.search('\S+\/(\S+)',each).group(1)
             dirname = dest_path + '/' + dirname + '/'
             os.system('mkdir -p %s'%dirname)
             ftpdownload(ftp,each,dirname)

 def ftpclose(ftp):
     ftp.quit()

 if __name__ == '__main__':
     ftp = ftpconnet('climb.genomics.cn',21,'','')
     ftpdownload(ftp,'/pub/10.5524/100001_101000/100145/','./')
     ftpclose(ftp)