Python从ftp服务器下载文件的代码

Python从ftp服务器下载文件的代码

#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)