python從ftp上下載檔案的方法：

首先匯入ftp模組；

然後使用【chdir】命令切換工作路徑；

再使用“self.ftp.nlst()”命令獲取目錄下的檔案；

最後使用“self.ftp.retrbinary()”命令下載ftp檔案即可。

#!/usr/bin/python
# coding=utf-8
import os
from ftplib import FTP # 引入ftp模組
class MyFtp:
  ftp = FTP()  
  def __init__(self,host,port=21):
    self.ftp.connect(host,port)  
  def login(self,username,pwd):
    self.ftp.set_debuglevel(2) # 開啟除錯級別2，顯示詳細資訊    
    self.ftp.login(username,pwd)    
    p
rint(self.ftp.welcome)  
  def downloadFile(self,localpath,remotepath,filename):
    os.chdir(localpath)  # 切換工作路徑到下載目錄
    self.ftp.cwd( remotepath)  # 要登入的ftp目錄
    self.ftp.nlst() # 獲取目錄下的檔案
    file_handle = open(filename,"wb").write  # 以寫模式在本地開啟檔案
    self.ftp.retrbinary('RETR %s' % os.path.basename(filename),file_handle,blocksize=1024) # 下載ftp檔案
    # ftp.delete（filename） # 刪除ftp伺服器上的檔案
  def close(self):
    self.ftp.set_debuglevel(0) # 關閉除錯    
    self.ftp.quit()if __name__ == '__main__':
  ftp = MyFtp('host')
  ftp.login('username','pwd')
  ftp.downloadFile('E:\\RED\\workspace\\appAuto\\apk\\Android10','/mobile/Android/release10/','xxx.apk')
  ftp.close()

例項擴充套件：

#coding=utf-8
'''
 ftp自動下載、自動上傳指令碼，可以遞迴目錄操作
'''

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

class MYFTP:
 def __init__(self,hostaddr,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'開始連線到 %s' %(self.hostaddr)
 ftp.connect(self.hostaddr,self.port)
 print u'成功連線到 %s' %(self.hostaddr)
 print u'開始登入到 %s' %(self.hostaddr)
 ftp.login(self.username,self.password)
 print u'成功登入到 %s' %(self.hostaddr)
 debug_print(ftp.getwelcome())
 except Exception:
 print u'連線或登入失敗'
 try:
 ftp.cwd(self.remotedir)
 except(Exception):
 print u'切換目錄失敗'

 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,remotefile):
 if self.is_same_size(localfile,remotefile):
 debug_print(u'%s 檔案大小相同，無需下載' %localfile)
 return
 else:
 debug_print(u'>>>>>>>>>>>>下載檔案 %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'目錄%s不存在，繼續...' %remotedir)
 return
 if not os.path.isdir(localdir):
 os.makedirs(localdir)
 debug_print(u'切換至目錄 %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'返回上層目錄 %s' %self.ftp.pwd())
 def upload_file(self,remotefile):
 if not os.path.isfile(localfile):
 return
 if self.is_same_size(localfile,remotefile):
 debug_print(u'跳過[相等]: %s' %localfile)
 return
 file_handler = open(localfile,'rb')
 self.ftp.storbinary('STOR %s' %remotefile,file_handler)
 file_handler.close()
 debug_print(u'已傳送: %s' %localfile)
 def upload_files(self,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'目錄已存在 %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)
 # 配置如下變數
 hostaddr = '211.15.113.45' # ftp地址
 username = 'UserName' # 使用者名稱
 password = '123456' # 密碼
 port = 21 # 埠號 
 rootdir_local = 'E:/mypiv' # 本地目錄
 rootdir_remote = '/PIV'  # 遠端目錄
 
 f = MYFTP(hostaddr,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 成功執行了備份n" %datenow
 debug_print(logstr)

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