python 文件下载服务器 脚本

import sys, os, time, _thread as thread from socket import *

blksz = 1024 defaultHost = 'localhost' defaultPort = 50001

helptext = """ Usage... server=> getfile.py -mode server [-port nnn] [-host hhh|localhost] client=> getfile.py [-mode client] -file fff [-port nnn] [-host hhh|localhost] """

def now(): return time.asctime()

def parsecommandline(): dict = {} # put in dictionary for easy lookup args = sys.argv[1:] # skip program name at front of args while len(args) >= 2: # example: dict['-mode'] = 'server' dict[args[0]] = args[1] args = args[2:] return dict

def client(host, port, filename): sock = socket(AF_INET, SOCK_STREAM) sock.connect((host, port)) sock.send((filename + '\n').encode()) # send remote name with dir: bytes dropdir = os.path.split(filename)[1] # filename at end of dir path file = open(dropdir, 'wb') # create local file in cwd while True: data = sock.recv(blksz) # get up to 1K at a time if not data: break # till closed on server side file.write(data) # store data in local file sock.close() file.close() print('Client got', filename, 'at', now())

def serverthread(clientsock): sockfile = clientsock.makefile('r') # wrap socket in dup file obj filename = sockfile.readline()[:-1] # get filename up to end-line try: file = open(filename, 'rb') while True: bytes = file.read(blksz) # read/send 1K at a time if not bytes: break # until file totally sent sent = clientsock.send(bytes) assert sent == len(bytes) except: print('Error downloading file on server:', filename) clientsock.close()

def server(host, port): serversock = socket(AF_INET, SOCK_STREAM) # listen on TCP/IP socket serversock.bind((host, port)) # serve clients in threads serversock.listen(5) while True: clientsock, clientaddr = serversock.accept() print('Server connected by', clientaddr, 'at', now()) thread.start_new_thread(serverthread, (clientsock,))

def main(args): host = args.get('-host', defaultHost) # use args or defaults port = int(args.get('-port', defaultPort)) # is a string in argv if args.get('-mode') == 'server': # None if no -mode: client if host == 'localhost': host = '' # else fails remotely server(host, port) elif args.get('-file'): # client mode needs -file client(host, port, args['-file']) else: print(helptext)

if name == 'main': args = parsecommandline() main(args)

文件下载客户端：gui

import sys, os from tkinter import * from tkinter.messagebox import showinfo

def onReturnKey(): cmdline = ('python getfile.py -mode client -file %s -port %s -host %s' % (content['File'].get(), content['Port'].get(), content['Server'].get())) os.system(cmdline) showinfo('getfilegui-1', 'Download complete')

box = Tk() labels = ['Server', 'Port', 'File'] content = {} for label in labels: row = Frame(box) row.pack(fill=X) Label(row, text=label, width=6).pack(side=LEFT) entry = Entry(row) entry.pack(side=RIGHT, expand=YES, fill=X) content[label] = entry

box.title('getfilegui-1') box.bind('<Return>', (lambda event: onReturnKey())) mainloop()

----------------------------------------------------------------------或者 import getfile from tkinter import * from tkinter.messagebox import showinfo

def onSubmit(): getfile.client(content['Server'].get(), int(content['Port'].get()), content['File'].get()) showinfo('getfilegui-2', 'Download complete')

box = Tk() labels = ['Server', 'Port', 'File'] rownum = 0 content = {} for label in labels: Label(box, text=label).grid(column=0, row=rownum) entry = Entry(box) entry.grid(column=1, row=rownum, sticky=E+W) content[label] = entry rownum += 1

box.columnconfigure(0, weight=0) # make expandable box.columnconfigure(1, weight=1) Button(text='Submit', command=onSubmit).grid(row=rownum, column=0, columnspan=2)

box.title('getfilegui-2') box.bind('<Return>', (lambda event: onSubmit())) mainloop()