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-8 importos fromftplibimportFTP#引入ftp模块 classMyFtp: ftp=FTP() def__init__(self,host,port=21): self.ftp.connect(host,port) deflogin(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) p rint(self.ftp.welcome) defdownloadFile(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 defclose(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:\\RED\\workspace\\appAuto\\apk\\Android10','/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 ''' fromftplibimportFTP importos,sys,string,datetime,time importsocket classMYFTP: 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) deflogin(self): ftp=self.ftp try: timeout=300 socket.setdefaulttimeout(timeout) ftp.set_pasv(True) printu'开始连接到%s'%(self.hostaddr) ftp.connect(self.hostaddr,self.port) printu'成功连接到%s'%(self.hostaddr) printu'开始登录到%s'%(self.hostaddr) ftp.login(self.username,self.password) printu'成功登录到%s'%(self.hostaddr) debug_print(ftp.getwelcome()) exceptException: printu'连接或登录失败' try: ftp.cwd(self.remotedir) except(Exception): printu'切换目录失败' defis_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:%dremotefile_size:%d'%(localfile_size,remotefile_size),) ifremotefile_size==localfile_size: return1 else: return0 defdownload_file(self,localfile,remotefile): ifself.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() defdownload_files(self,localdir='./',remotedir='./'): try: self.ftp.cwd(remotedir) except: debug_print(u'目录%s不存在,继续...'%remotedir) return ifnotos.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 foriteminremotenames: filetype=item[0] filename=item[1] local=os.path.join(localdir,filename) iffiletype=='d': self.download_files(local,filename) eliffiletype=='-': self.download_file(local,filename) self.ftp.cwd('..') debug_print(u'返回上层目录%s'%self.ftp.pwd()) defupload_file(self,localfile,remotefile): ifnotos.path.isfile(localfile): return ifself.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) defupload_files(self,localdir='./',remotedir='./'): ifnotos.path.isdir(localdir): return localnames=os.listdir(localdir) self.ftp.cwd(remotedir) foriteminlocalnames: src=os.path.join(localdir,item) ifos.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('..') defget_file_list(self,line): ret_arr=[] file_arr=self.get_filename(line) iffile_arr[1]notin['.','..']: self.file_list.append(file_arr) defget_filename(self,line): pos=line.rfind(':') while(line[pos]!=''): pos+=1 while(line[pos]==''): pos+=1 file_arr=[line[0],line[pos:]] returnfile_arr defdebug_print(s): prints 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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