前言
下载文件时,最怕中途断线,无法成功下载完整的文件。断点续传就是从文件中断的地方接下去下载,而不必重新下载。这项功能对于下载较大文件时非常有用。那么这篇文章就来给大家分享如何利用python实现可以断点续传和并发的ftp程序。
一、要求
1、用户md5认证
2、支持多用户同时登陆(并发)
3、进入用户的命令行模式,支持cd切换目录,ls查看目录子文件
4、执行命令(ipconfig)
5、传输文件:
a、支持断点续传
b、传输中显示进度条
二、思路
1.客户端用户登录和注册:
a、客户端仅提供用户名和密码,选择登录或注册,
b、服务器端进行注册并将加密后的密码写入文件,最后返回给客户端是否登录或注册成功
2.ls和cd命令
a、客户端输入命令,服务器端处理并返回给客户端
3.执行命令:
a、客户端发送需要执行的命令
b、服务器端执行命令,并返回客户端需要接收该命令的次数s=r[0]+1,其中r=divmod(结果总长度,1024)
c、客户端收到次数,告诉服务端已经收到
d、服务端发送执行结果,客户端进行for循环接收该结果
4.发送文件:
a、客户端输入文件路径(测试版路径为:f.png),发送文件名和文件大小
b、服务器端检测指定目录是否含有该文件,如果没有,返回给客户端字符串s,即从头开始发送start,has_recv=0
如果有,即需要断点续传,返回给客户端已经上传了多少has_recv
c、客户端接收返回值,并seek到has_recv的位置,进行循环收发,打印当前进度,直到传输完毕。
注:本程序可循环接收用户选择传输文件和执行命令
三、代码
配置文件:
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#!/usr/bin/env python # -*- coding: utf-8 -*- import os BASE_DIR = os.path.dirname(os.path.dirname(__file__)) #配置文件的上层目录 NEW_FILENAME = os.path.join(BASE_DIR, 'view' ) #新文件目录 NAME_PWD = os.path.join(BASE_DIR, 'db' , 'name_pwd' ) #用户名和密码目录 USER_FILE = os.path.join(BASE_DIR, 'db' ) |
服务器端:
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#!/usr/bin/env python # -*- coding: utf-8 -*- import sys,os import time import socket import hashlib import pickle import subprocess import socketserver sys.path.append(os.path.dirname(os.path.dirname(__file__))) from config import settings new = settings.NEW_FILENAME class Myserver(socketserver.BaseRequestHandler): def recv_file( self ): ''' 文件传输 :return: ''' conn = self .request a = str (conn.recv( 1024 ),encoding = 'utf-8' ) file_size,file_name = a.split( ',' ) new_file_name = os.path.join(new,file_name) if file_name in new: #检测文件是否已存在,涉及断点续传 has_recv = os.stat(new).st_size #计算临时文件大小 conn.sendall(bytes(has_recv,encoding = 'utf-8' )) with open (new_file_name, 'ab' ) as f: #追加模式 while has_recv< = int (file_size): data = conn.recv( 1024 ) f.write(data) has_recv + = len (data) else : has_recv = 0 conn.sendall(bytes( 's' ,encoding = 'utf-8' )) # 客户端收到字符串s,从0开始发送 with open (new_file_name, 'wb' ) as f: while has_recv< = int (file_size): data = conn.recv( 1024 ) f.write(data) has_recv + = len (data) def command( self ): ''' 执行命令 :return: ''' conn = self .request a = conn.recv( 1024 ) ret = str (a,encoding = 'utf-8' ) ret2 = subprocess.check_output(ret, shell = True ) r = divmod ( len (ret2), 1024 ) s = r[ 0 ] + 1 #客户端需要接收的次数 conn.sendall(bytes( str (s),encoding = 'utf-8' )) conn.recv( 1024 ) #确认客户端收到需要接收的次数 conn.sendall(ret2) def md5( self ,pwd): ''' 对密码进行加密 :param pwd: 密码 :return: ''' hash = hashlib.md5(bytes( 'xx7' ,encoding = 'utf-8' )) hash .update(bytes(pwd,encoding = 'utf-8' )) return hash .hexdigest() def login( self ,usrname,pwd): ''' 登陆 :param usrname: 用户名 :param pwd: 密码 :return:是否登陆成功 ''' conn = self .request s = pickle.load( open (settings.NAME_PWD, 'rb' )) if usrname in s: if s[usrname] = = self .md5(pwd): #和加密后的密码进行比较 return True else : return False else : return False def regist( self ,usrname,pwd): ''' 注册 :param usrname: 用户名 :param pwd: 密码 :return:是否注册成功 ''' conn = self .request s = pickle.load( open (settings.NAME_PWD, 'rb' )) if usrname in s: return False else : s[usrname] = self .md5(pwd) mulu = os.path.join(settings.USER_FILE,usrname) os.makedirs(mulu, 'a' ) pickle.dump(s, open (settings.NAME_PWD, 'wb' )) return True def before( self ,usrname,pwd,ret): ''' 判断注册和登陆,并展示用户的详细目录信息,支持cd和ls命令 :return: ''' conn = self .request if ret = = '1' : r = self .login(usrname,pwd) if r: conn.sendall(bytes( 'y' ,encoding = 'utf-8' )) else : conn.sendall(bytes( 'n' ,encoding = 'utf-8' )) elif ret = = '2' : # print(usrname,pwd) r = self .regist(usrname,pwd) if r: conn.sendall(bytes( 'y' ,encoding = 'utf-8' )) else : conn.sendall(bytes( 'n' ,encoding = 'utf-8' )) def usr_file( self ,usrname): ''' 展示用户的详细目录信息,支持cd和ls命令 :param usrname: 用户名 :return: ''' conn = self .request conn.recv( 1024 ) mulu = os.path.join(settings.USER_FILE,usrname) conn.sendall(bytes(mulu,encoding = 'utf-8' )) while True : b = conn.recv( 1024 ) ret = str (b,encoding = 'utf-8' ) try : a,b = ret.split( ' ' , 1 ) except Exception as e: a = ret if a = = 'cd' : if b = = '..' : mulu = os.path.dirname(mulu) else : mulu = os.path.join(mulu,b) conn.sendall(bytes(mulu,encoding = 'utf-8' )) elif a = = 'ls' : ls = os.listdir(mulu) print (ls) a = ',' .join(ls) conn.sendall(bytes(a,encoding = 'utf-8' )) elif a = = 'q' : break def handle( self ): conn = self .request conn.sendall(bytes( 'welcome' ,encoding = 'utf-8' )) b = conn.recv( 1024 ) ret = str (b,encoding = 'utf-8' ) print (ret) conn.sendall(bytes( 'b ok' ,encoding = 'utf-8' )) c = conn.recv( 1024 ) r = str (c,encoding = 'utf-8' ) usrname,pwd = r.split( ',' ) self .before(usrname,pwd,ret) #登陆或注册验证 self .usr_file(usrname) #展示用户的详细目录信息,支持cd和ls命令 while True : a = conn.recv( 1024 ) conn.sendall(bytes( '收到a' ,encoding = 'utf-8' )) ret = str (a,encoding = 'utf-8' ) if ret = = '1' : self .recv_file() # conn.sendall(bytes('file ok',encoding='utf-8')) elif ret = = '2' : self .command() elif ret = = 'q' : break else : pass if __name__ = = '__main__' : sever = socketserver.ThreadingTCPServer(( '127.0.0.1' , 9999 ),Myserver) sever.serve_forever() |
客户端:
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#!/usr/bin/env python # -*- coding: utf-8 -*- import sys import time import os import socket sys.path.append(os.path.dirname(os.path.dirname(__file__))) from config import settings def send_file(file_path): ''' 发送文件 :param file_name:文件名 :return: ''' size = os.stat(file_path).st_size file_name = os.path.basename(file_path) obj.sendall(bytes( str (size) + ',' + file_name,encoding = 'utf-8' )) #发送文件大小和文件名 ret = obj.recv( 1024 ) #接收已经传了多少 r = str (ret,encoding = 'utf-8' ) if r = = 's' : #文件不存在,从头开始传 has_send = 0 else : #文件存在 has_send = int (r) with open (file_path, 'rb' ) as f: f.seek(has_send) #定位到已经传到的位置 while has_send<size: data = f.read( 1024 ) obj.sendall(data) has_send + = len (data) sys.stdout.write( '\r' ) #清空文件内容 time.sleep( 0.2 ) sys.stdout.write( '已发送%s%%|%s' % ( int (has_send / size * 100 ),( round (has_send / size * 40 ) * '★' ))) sys.stdout.flush() #强制刷出内存 print ( "上传成功\n" ) def command(command_name): ''' 执行命令 :param command_name: :return: ''' obj.sendall(bytes(command_name,encoding = 'utf-8' )) ret = obj.recv( 1024 ) #接收命令需要接收的次数 obj.sendall(bytes( '收到次数' ,encoding = 'utf-8' )) r = str (ret,encoding = 'utf-8' ) for i in range ( int (r)): #共需要接收int(r)次 ret = obj.recv( 1024 ) #等待客户端发送 r = str (ret,encoding = 'GBK' ) print (r) def login(usrname,pwd): ''' 登陆 :param usrname:用户名 :param pwd:密码 :return:是否登陆成功 ''' obj.sendall(bytes(usrname + ',' + pwd,encoding = 'utf-8' )) ret = obj.recv( 1024 ) r = str (ret,encoding = 'utf-8' ) if r = = 'y' : return 1 else : return 0 def regist(usrname,pwd): ''' 注册 :param usrname:用户名 :param pwd:密码 :return:是否注册成功 ''' obj.sendall(bytes(usrname + ',' + pwd,encoding = 'utf-8' )) ret = obj.recv( 1024 ) r = str (ret,encoding = 'utf-8' ) if r = = 'y' : return 1 else : return 0 def before(usrname,pwd): ''' 选择登陆或注册,展示用户的详细目录信息,支持cd和ls命令 :return: ''' a = input ( '请选择1.登陆 2.注册' ) obj.sendall(bytes(a,encoding = 'utf-8' )) obj.recv( 1024 ) if a = = '1' : ret = login(usrname,pwd) if ret: print ( '登陆成功' ) return 1 else : print ( '用户名或密码错误' ) return 0 elif a = = '2' : ret = regist(usrname,pwd) if ret: print ( '注册成功' ) return 1 else : print ( '用户名已存在' ) return 0 def usr_file(usrname): obj.sendall(bytes( '打印用户文件路径' ,encoding = 'utf-8' )) ret = obj.recv( 1024 ) #等待客户端发送 r = str (ret,encoding = 'utf-8' ) print (r) while True : a = input ( '输入cd切换目录,ls查看目录详细信息,q退出>:' ) obj.sendall(bytes(a,encoding = 'utf-8' )) if a = = 'q' : break else : ret = obj.recv( 1024 ) #等待客户端发送 r = str (ret,encoding = 'utf-8' ) if len (r) = = 1 : #判断是cd结果还是ls的结果(ls只有一个子目录也可以直接打印) print (r) else : li = r.split( ',' ) for i in li: print (i) #打印每一个子目录 def main(usrname,pwd): ret = obj.recv( 1024 ) #等待客户端发送 r = str (ret,encoding = 'utf-8' ) print (r) result = before(usrname,pwd) #登陆或注册 if result: usr_file(usrname) while True : a = input ( '请选择1.传文件 2.执行命令 q退出:' ) obj.sendall(bytes( str (a),encoding = 'utf-8' )) ret = obj.recv( 1024 ) #确认是否收到a r = str (ret,encoding = 'utf-8' ) print (r) if a = = '1' : b = input ( '请输入文件路径(测试版路径为:f.png):' ) # b='f.png' if os.path.exists(b): send_file(b) obj.sendall(bytes( 'hhe' ,encoding = 'utf-8' )) # obj.recv(1024) elif a = = '2' : b = input ( '请输入command:' ) command(b) elif a = = 'q' : break else : print ( '输入错误' ) obj.close() if __name__ = = '__main__' : obj = socket.socket() #创建客户端socket对象 obj.connect(( '127.0.0.1' , 9999 )) usrname = input ( '请输入用户名' ) pwd = input ( '请输入密码' ) main(usrname,pwd) |
总结
以上就是python实现可以断点续传和并发的ftp程序的全部内容,文章介绍的很详细,希望对大家学习或者使用python带来一定的帮助。