python实现从ftp服务器下载文件

代码之余，将代码过程重要的一些代码段备份一下，如下的代码内容是关于Python从ftp服务器下载文件的的代码，希望能对小伙伴有用途。

#coding=utf-8
'''
 ftp自动下载、自动上传脚本，可以递归目录操作
'''

from ftplib import FTP
import os,sys,string,datetime,time
import socket

class MYFTP:
 def __init__(self, hostaddr, username, password, remotedir, port=21):
 self.hostaddr = hostaddr
 self.username = username
 self.password = password
 self.remotedir = remotedir
 self.port   = port
 self.ftp   = FTP()
 self.file_list = []
 # self.ftp.set_debuglevel(2)
 def __del__(self):
 self.ftp.close()
 # self.ftp.set_debuglevel(0)
 def login(self):
 ftp = self.ftp
 try:
  timeout = 300
  socket.setdefaulttimeout(timeout)
  ftp.set_pasv(True)
  print u'开始连接到 %s' %(self.hostaddr)
  ftp.connect(self.hostaddr, self.port)
  print u'成功连接到 %s' %(self.hostaddr)
  print u'开始登录到 %s' %(self.hostaddr)
  ftp.login(self.username, self.password)
  print u'成功登录到 %s' %(self.hostaddr)
  debug_print(ftp.getwelcome())
 except Exception:
  print u'连接或登录失败'
 try:
  ftp.cwd(self.remotedir)
 except(Exception):
  print u'切换目录失败'

 def is_same_size(self, localfile, remotefile):
 try:
  remotefile_size = self.ftp.size(remotefile)
 except:
  remotefile_size = -1
 try:
  localfile_size = os.path.getsize(localfile)
 except:
  localfile_size = -1
 debug_print('localfile_size:%d remotefile_size:%d' %(localfile_size, remotefile_size),)
 if remotefile_size == localfile_size:
  return 1
 else:
  return 0
 def download_file(self, localfile, remotefile):
 if self.is_same_size(localfile, remotefile):
  debug_print(u'%s 文件大小相同，无需下载' %localfile)
  return
 else:
  debug_print(u'>>>>>>>>>>>>下载文件 %s ... ...' %localfile)
 #return
 file_handler = open(localfile, 'wb')
 self.ftp.retrbinary(u'RETR %s'%(remotefile), file_handler.write)
 file_handler.close()

 def download_files(self, localdir='./', remotedir='./'):
 try:
  self.ftp.cwd(remotedir)
 except:
  debug_print(u'目录%s不存在，继续...' %remotedir)
  return
 if not os.path.isdir(localdir):
  os.makedirs(localdir)
 debug_print(u'切换至目录 %s' %self.ftp.pwd())
 self.file_list = []
 self.ftp.dir(self.get_file_list)
 remotenames = self.file_list
 #print(remotenames)
 #return
 for item in remotenames:
  filetype = item[0]
  filename = item[1]
  local = os.path.join(localdir, filename)
  if filetype == 'd':
  self.download_files(local, filename)
  elif filetype == '-':
  self.download_file(local, filename)
 self.ftp.cwd('..')
 debug_print(u'返回上层目录 %s' %self.ftp.pwd())
 def upload_file(self, localfile, remotefile):
 if not os.path.isfile(localfile):
  return
 if self.is_same_size(localfile, remotefile):
  debug_print(u'跳过[相等]: %s' %localfile)
  return
 file_handler = open(localfile, 'rb')
 self.ftp.storbinary('STOR %s' %remotefile, file_handler)
 file_handler.close()
 debug_print(u'已传送: %s' %localfile)
 def upload_files(self, localdir='./', remotedir = './'):
 if not os.path.isdir(localdir):
  return
 localnames = os.listdir(localdir)
 self.ftp.cwd(remotedir)
 for item in localnames:
  src = os.path.join(localdir, item)
  if os.path.isdir(src):
  try:
   self.ftp.mkd(item)
  except:
   debug_print(u'目录已存在 %s' %item)
  self.upload_files(src, item)
  else:
  self.upload_file(src, item)
 self.ftp.cwd('..')

 def get_file_list(self, line):
 ret_arr = []
 file_arr = self.get_filename(line)
 if file_arr[1] not in ['.', '..']:
  self.file_list.append(file_arr)

 def get_filename(self, line):
 pos = line.rfind(':')
 while(line[pos] != ' '):
  pos += 1
 while(line[pos] == ' '):
  pos += 1
 file_arr = [line[0], line[pos:]]
 return file_arr
def debug_print(s):
 print s

if __name__ == '__main__':
 timenow = time.localtime()
 datenow = time.strftime('%Y-%m-%d', timenow)
 # 配置如下变量
 hostaddr = '211.15.113.45' # ftp地址
 username = 'UserName' # 用户名
 password = '123456' # 密码
 port = 21  # 端口号
 rootdir_local = 'E:/mypiv' # 本地目录
 rootdir_remote = '/PIV'     # 远程目录

 f = MYFTP(hostaddr, username, password, rootdir_remote, port)
 f.login()
 f.download_files(rootdir_local, rootdir_remote)

 timenow = time.localtime()
 datenow = time.strftime('%Y-%m-%d', timenow)
 logstr = u"%s 成功执行了备份n" %datenow
 debug_print(logstr)

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