Python使用ftplib实现简易FTP客户端的方法

#!/usr/bin/python 
#-*- coding:utf-8 -*- 
from ftplib import FTP #加载ftp模块 
ftp=FTP() #设置变量 
ftp.set_debuglevel(2) #打开调试级别2，显示详细信息 
ftp.connect("IP","port") #连接的ftp sever和端口 
ftp.login("user","password")#连接的用户名，密码 
print ftp.getwelcome() #打印出欢迎信息 
ftp.cmd("xxx/xxx") #更改远程目录 
bufsize=1024 #设置的缓冲区大小 
filename="filename.txt" #需要下载的文件 
file_handle=open(filename,"wb").write
#以写模式在本地打开文件 
ftp.retrbinaly("RETR filename.txt",file_handle,bufsize)
#接收服务器上文件并写入本地文件 
ftp.set_debuglevel(0) #关闭调试模式 
ftp.quit #退出ftp 
ftp.dir() #显示目录下文件信息 
ftp.mkd(pathname) #新建远程目录 
ftp.pwd() #返回当前所在位置 
ftp.rmd(dirname) #删除远程目录 
ftp.delete(filename) #删除远程文件 
ftp.rename(fromname, toname)#将fromname修改名称为toname。 
ftp.storbinaly("STOR filename.txt",file_handel,bufsize) #上传目标文件

一个FTP完整实例：

#coding:utf-8 
from ctypes import * 
import os 
import sys 
import ftplib 
class myFtp: 
 ftp = ftplib.FTP() 
 bIsDir = False 
 path = "" 
 def __init__(self, host, port='21'): 
 self.ftp.set_debuglevel(2) #打开调试级别2，显示详细信息 
 #self.ftp.set_pasv(0) #0主动模式 1 #被动模式 
 self.ftp.connect( host, port ) 
 def Login(self, user, passwd ): 
 self.ftp.login( user, passwd ) 
 print self.ftp.welcome 
 def DownLoadFile( self, LocalFile, RemoteFile ): 
 file_handler = open( LocalFile, 'wb' ) 
 self.ftp.retrbinary( "RETR %s" %( RemoteFile ), file_handler.write ) 
 file_handler.close() 
 return True 
 def UpLoadFile( self, LocalFile, RemoteFile ): 
 if os.path.isfile( LocalFile ) == False: 
 return False 
 file_handler = open( LocalFile, "rb" ) 
 self.ftp.storbinary( 'STOR %s'%RemoteFile, file_handler, 4096 )
 file_handler.close() 
 return True 
 def UpLoadFileTree( self, LocalDir, RemoteDir ): 
 if os.path.isdir( LocalDir ) == False: 
 return False 
 LocalNames = os.listdir( LocalDir ) 
 print RemoteDir 
 self.ftp.cwd( RemoteDir ) 
 for Local in LocalNames: 
 src = os.path.join( LocalDir, Local) 
 if os.path.isdir( src ): 
 self.UpLoadFileTree( src, Local ) 
 else: 
 self.UpLoadFile( src, Local ) 
 self.ftp.cwd( ".." ) 
 return 
 def DownLoadFileTree( self, LocalDir, RemoteDir ): 
 if os.path.isdir( LocalDir ) == False: 
 os.makedirs( LocalDir ) 
 self.ftp.cwd( RemoteDir ) 
 RemoteNames = self.ftp.nlst() 
 for file in RemoteNames: 
 Local = os.path.join( LocalDir, file ) 
 if self.isDir( file ): 
 self.DownLoadFileTree( Local, file ) 
 else: 
 self.DownLoadFile( Local, file ) 
 self.ftp.cwd( ".." ) 
 return 
 def show( self, list ): 
 result = list.lower().split( " " ) 
 if self.path in result and "" in result: 
 self.bIsDir = True 
 def isDir( self, path ): 
 self.bIsDir = False 
 self.path = path 
 #this ues callback function ,that will change bIsDir value 
 self.ftp.retrlines( 'LIST', self.show ) 
 return self.bIsDir 
 def close( self ): 
 self.ftp.quit() 
ftp = myFtp('********') 
ftp.Login('*****','*****') 
#ftp.DownLoadFile('TEST.TXT', 'others\runtime.log')#ok 
#ftp.UpLoadFile('runtime.log', 'others\runtime.log')#ok 
#ftp.DownLoadFileTree('bcd', 'others\abc')#ok 
#ftp.UpLoadFileTree('aaa',"others\" ) 
ftp.close()
print "ok!"

希望本文所述对大家的Python程序设计有所帮助。