好吧,在拜讀完《Python網路程式設計基礎》之後,回頭再搞一搞16章的網路程式設計吧。
Let‘s go!
16.4.修改書上示例的TCP和UDP客戶端,使得伺服器的名字不要在程式碼裡寫死,要允許使用者指定一個主機名和埠。只有兩個值都沒有輸入是才使用預設值。
難度不大。
#tsTclnt.py #!/usr/bin/env python #-*-coding:utf-8-*- from socket import * import sys if(len(sys.argv) < 3): HOST = 'localhost' PORT = 21567 else: HOST = sys.argv[1] PORT = int(sys.argv[2]) BUFSIZ = 1024 ADDR = (HOST,PORT) tcpCliSock = socket(AF_INET,SOCK_STREAM) tcpCliSock.connect(ADDR) while True: data = raw_input('> ') if not data: break tcpCliSock.send(data) data = tcpCliSock.recv(BUFSIZ) if not data: break print data tcpCliSock.close()
#tsUclnt.py #!/usr/bin/env python #-*- coding:utf-8 -*- from socket import * import sys if(len(sys.argv) < 3): HOST = 'localhost' PORT = 21567 else: HOST = sys.argv[1] PORT = sys.argv[2] #print sys.argv[1],sys.argv[2] BUFSIZ = 1024 ADDR = (HOST,int(PORT)) udpCliSock = socket(AF_INET,SOCK_DGRAM) while True: data = raw_input('> ') if not data: break udpCliSock.sendto(data,ADDR) data,ADDR = udpCliSock.recvfrom(BUFSIZ) if not data: break print data udpCliSock.close()
16.5.修改伺服器示例程式碼,使得它能根據不同的請求而作出應答。
這道題目本質上也不難,只需要在伺服器的死迴圈程式加上條件判斷即可。
版本1:純TCP伺服器端修改。
#!/usr/bin/env python #-*- coding:utf-8 -*- from socket import * import time,os HOST = '' PORT = 21567 BUFSIZ = 1024 ADDR = (HOST,PORT) tcpSerSock = socket(AF_INET,SOCK_STREAM) tcpSerSock.bind(ADDR) tcpSerSock.listen(5) while True: print 'waiting for connection...' tcpCliSock,addr = tcpSerSock.accept() print '...connected from:',addr while True: data = tcpCliSock.recv(BUFSIZ) data = data.strip() if not data: break if data == "date": tcpCliSock.send('%s' % (time.ctime(time.time()))) elif data == "os": tcpCliSock.send('%s' % (os.name)) elif data == "ls": tcpCliSock.send('%s' % (os.listdir(os.curdir))) else: tcpCliSock.send('[%s] %s' % (ctime(),data)) tcpCliSock.close() tcpSerSock.close()
版本2:使用現成的伺服器框架進行修改。
#!/usr/bin/env python #-*-coding:utf-8-*- from SocketServer import ThreadingMixIn,TCPServer,StreamRequestHandler import time,os,re class TxRequestHandler(StreamRequestHandler): def handle(self): req = self.rfile.readline().strip() m = re.match('(\w+)\s+([\w+/]+)',req) if req == "date": result = time.ctime(time.time()) elif req == "os": result = os.name elif req == "ls": result = str(os.listdir(os.curdir)) elif m is not None and m.lastindex == 2 and m.group(1) == 'ls': result = str(os.listdir(m.group(2))) else: result = """ date -- 伺服器將返回它的當前時間 os -- 得到作業系統的資訊 ls -- 得到當前目錄的檔案列表 """ self.wfile.write(result+"\n") class TxServer(ThreadingMixIn,TCPServer): allow_reuse_address = 1 serveraddr = ('',8765) srvr = TxServer(serveraddr,TxRequestHandler) srvr.serve_forever()
16.7.實現一個半雙工的聊天方式,其中一個人是服務端,另一個人是客戶端。
其實也不難,只是將回射伺服器做部分修改就可以。
伺服器端:
#!/usr/bin/env python #-*- coding:utf-8 -*- from socket import * from time import ctime HOST = '' PORT = 21567 BUFSIZ = 1024 ADDR = (HOST,PORT) tcpSerSock = socket(AF_INET,SOCK_STREAM) tcpSerSock.bind(ADDR) tcpSerSock.listen(5) while True: print 'waiting for connection...' tcpCliSock,addr = tcpSerSock.accept() print '...connected from:',addr while True: rdata = tcpCliSock.recv(BUFSIZ) if not rdata: break print rdata sdata = raw_input(">") tcpCliSock.send('[%s] %s' % (ctime(),sdata)) tcpCliSock.close() tcpSerSock.close()
客戶端:
#!/usr/bin/env python #-*-coding:utf-8-*- from socket import * import sys if(len(sys.argv) < 3): HOST = 'localhost' PORT = 21567 else: HOST = sys.argv[1] PORT = int(sys.argv[2]) BUFSIZ = 1024 ADDR = (HOST,PORT) tcpCliSock = socket(AF_INET,SOCK_STREAM) tcpCliSock.connect(ADDR) while True: data = raw_input('> ') if not data: break tcpCliSock.send(data) data = tcpCliSock.recv(BUFSIZ) if not data: break print data tcpCliSock.close()
16.8.實現一個全雙工的聊天方式,即兩個人可以獨立地傳送和接收訊息。
全雙工其實原理也不太難,但是我一直傻逼了,一直用寫伺服器端的方法去實現客戶端的程式。
我所使用的方法也是最常用的技術——多執行緒。以下是伺服器端和客戶端的編寫思路:
伺服器端:在伺服器端我主要用了一個主執行緒來accept客戶端的連結,沒接受了一個連線,就新建兩個執行緒,一個用於傳送訊息,一個用於接收訊息。
客戶端:思路完全不一樣,由於客戶端面對的只有伺服器,所以主執行緒只能是接收訊息(傳送訊息),然後傳送訊息(接收訊息)作為一個執行緒來併發。
由於這裡的資料並不是共享的,所以這裡的執行緒寫起來就很輕鬆,不用考慮同步問題。
伺服器端:
#!/usr/bin/env python #-*- coding:utf-8 -*- import socket,traceback,os from threading import * host = '' port = 51423 #監聽所有的介面 #接受訊息的執行緒 def handlerecv(clientsock): print "New child",currentThread().getName() print "Got connection from",clientsock.getpeername() while True: data = clientsock.recv(4096) if not len(data): break print data clientsock.close() #傳送訊息的執行緒 def handlesend(clientsock): while True: data = raw_input(">") data = data + "\n"; #加上換行,好看一點。 clientsock.sendall(data) #關閉連線 clientsock.close() #建立套接字 s = socket.socket(socket.AF_INET,socket.SOCK_STREAM) s.setsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR,1) s.bind((host,port)) s.listen(1) while True: try: clientsock,clientaddr = s.accept() except KeyboardInterrupt: raise except: traceback.print_exc() continue t = Thread(target = handlerecv,args=[clientsock]) t.setDaemon(1) t.start() r = Thread(target = handlesend,args=[clientsock]) r.setDaemon(1) r.start()
客戶端:
#!/usr/bin/env python #-*-coding:utf-8-*- from socket import * import sys from threading import * if(len(sys.argv) < 3): HOST = 'localhost' PORT = 51423 else: HOST = sys.argv[1] PORT = int(sys.argv[2]) BUFSIZ = 1024 ADDR = (HOST,PORT) def handlesend(tcpCliSock): while True: sdata = raw_input('> ') if not sdata: break tcpCliSock.send(sdata) tcpCliSock.close() tcpCliSock = socket(AF_INET,SOCK_STREAM) tcpCliSock.connect(ADDR) #建立傳送訊息的執行緒 s = Thread(target = handlesend,args=[tcpCliSock]) s.setDaemon(1) s.start() while True: rdata = tcpCliSock.recv(BUFSIZ) if not rdata: break print rdata tcpCliSock.close()
16.10.實現一個多房間全雙工的聊天方式,把聊天伺服器改成支援多使用者版本。
其實思路差不多,只不過過程有點繁瑣,在伺服器端要建立字典,作為房間,然後每個套接字存在字典當中,然後作適當的分發。
另外一種方法使用廣播不知道可不可以了。
這裡直接貼人家寫的程式碼學習一下:
伺服器端:
#!/usr/bin/env python # _*_ coding: utf8 _*_ from socket import * from time import ctime import threading from string import split HOST = '' PORT = 21567 BUFSIZE = 1024 ADDR = (HOST, PORT) def Deal(sck, username, room): while True: data = sck.recv(BUFSIZE) for i in clients[room].iterkeys(): if i <> username: if data <> "quit": clients[room][i].send("[%s] %s: %s" %(ctime(), username, data)) else: clients[room][i].send("使用者%s在%s退出房間%s" %(username, ctime(), room )) if data == "quit": del clients[room][username] sck.send(data) sck.close() break chatSerSock = socket(AF_INET, SOCK_STREAM) chatSerSock.bind(ADDR) chatSerSock.listen(5) clients = {"":{},} while True: print 'waiting for connection...' chatCliSock, addr = chatSerSock.accept() print "...connected romt: ", addr data = chatCliSock.recv(BUFSIZE) username, room = split(data) print username if not clients.has_key(room): clients[room] = {} if clients[room].has_key(username): chatCliSock.send("reuse") chatCliSock.close() else: chatCliSock.send("success") clients[room][username] = chatCliSock t = threading.Thread(target=Deal, args=(chatCliSock, username, room)) t.start() chatSerSock.close()
客戶端:
#!/usr/bin/env python # _*_ coding: utf8 _*_ from socket import * from time import ctime import threading import random from sys import argv, exit, stdout from getopt import gnu_getopt, GetoptError help_info = ["cs.py [ -h | --help | -u | --username] username", "\t-h or --help\t顯示幫助資訊", "\t-u or --username\指定使用者名稱", "\t-r or --room\t指定房間"] def help(): for i in help_info: print i def Send(sck, test): while True: data = raw_input('>') sck.send(data) if data == "quit": break def Recieve(sck, test): while True: data = sck.recv(BUFSIZ) if data == "quit": sck.close() break str = "\n" + data + "\n>" stdout.write(str) HOST = 'localhost' PORT= 21567 BUFSIZ = 1024 ADDR = (HOST, PORT) threads = [] if __name__ == "__main__": # 解析命令列引數 try: opts, args = gnu_getopt(argv[1:], "hu:r:", ["help", "username=", "room="]) except GetoptError, err: print str(err) help() exit(2) username = "" room = "" for o, a in opts: if o in ("-h", "--help"): help() exit(0) elif o in ("-u", "--username"): username = a elif o in ("-r", "--room"): room = a else: print "未知選項" help() exit(2) if not username or not room: help() exit(2) chatCliSock = socket(AF_INET, SOCK_STREAM) chatCliSock.connect(ADDR) chatCliSock.send("%s %s" %(username, room)) data = chatCliSock.recv(BUFSIZ) if data == "reuse": print "使用者%s已登入房間%s" %(username, room) raw_input() exit(1) elif data == "success": print "使用者%s成功登入房間%s" %(username, room) t = threading.Thread(target=Send, args = (chatCliSock, None)) threads.append(t) t = threading.Thread(target=Recieve, args = (chatCliSock, None)) threads.append(t) for i in range(len(threads)): threads[i].start() threads[0].join()
16.11.寫一個網頁客戶端。自己新建一個套接字,然後傳送http請求。
感覺難度不大。
#!/usr/bin/env python #-*-coding:utf-8-*- import socket,sys website = sys.argv[1] port = 80 print website print "Creating socket...", s = socket.socket(socket.AF_INET,socket.SOCK_STREAM) print "done." print "Connecting to ...", s.connect((website,port)) print "done." s.send("GET /index.html HTTP/1.0\r\n\r\n") data = s.recv(4096) print data
16-12.休眠伺服器,在伺服器端上面加個sleep(num)就好,在這裡就不貼了。
16-13.功能太過複雜,本人渣渣,沒精力寫。
16-14.考慮的東西很多,水平有限,不做了。
16-15.非同步和SocketServer。這個用多執行緒可以實現,在《python網路程式設計基礎》上面直接有原始碼。使用方法都有教。
#!/usr/bin/env python #-*- coding:utf-8 -*- from SocketServer import ThreadingMixIn,TCPServer,StreamRequestHandler import time class TimeRequestHandler(StreamRequestHandler): def handle(self): req = self.rfile.readline().strip() if req == "asctime": result = time.asctime() elif req == "seconds": result = str(int(time.time())) elif req == "rfc822": result = time.strftime("%a, %d %b %Y %H:%M:%S +0000",time.gmtime()) else: result = """ Unhandled request.Send a line with one of the following words: asctime -- for human-readable time seconds -- seconds since the Unix Epoch rfc822 -- data/time in format used for mail and news posts """ self.wfile.write(result + "\n") class TimeServer(ThreadingMixIn,TCPServer): allow_reuse_address = 1 serveraddr = ('',8765) srvr = TimeServer(serveraddr,TimeRequestHandler) srvr.serve_forever()
轉載請註明出處http://www.cnblogs.com/sysu-blackbear/
多多指教!謝謝!