python实现从ftp上下载文件的实例方法

python从ftp上下载文件的方法：

首先导入ftp模块；

然后使用【chdir】命令切换工作路径；

再使用“self.ftp.nlst()”命令获取目录下的文件；

最后使用“self.ftp.retrbinary()”命令下载ftp文件即可。

#!/usr/bin/python# coding=utf-8import osfrom ftplib import FTP # 引入ftp模块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) # 打开调试级别2，显示详细信息self.ftp.login(username,pwd)print(self.ftp.welcome) def downloadFile(self,localpath,remotepath,filename): os.chdir(localpath) # 切换工作路径到下载目录 self.ftp.cwd( remotepath) # 要登录的ftp目录 self.ftp.nlst() # 获取目录下的文件 file_handle = open(filename,'wb').write # 以写模式在本地打开文件 self.ftp.retrbinary(’RETR %s’ % os.path.basename(filename),file_handle,blocksize=1024) # 下载ftp文件 # ftp.delete（filename） # 删除ftp服务器上的文件 def close(self): self.ftp.set_debuglevel(0) # 关闭调试self.ftp.quit()if __name__ == ’__main__’: ftp = MyFtp(’host’) ftp.login(’username’,’pwd’) ftp.downloadFile(’E:REDworkspaceappAutoapkAndroid10’,’/mobile/Android/release10/’,’xxx.apk’) ftp.close()

实例扩展：

#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 FTPimport os,sys,string,datetime,timeimport socketclass 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_arrdef debug_print(s): print sif __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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