Python网络编程常用代码
服务器端代码:
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# -*- coding: cp936 -*- import socket sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) #初始化socket sock.bind(( "127.0.0.1" , 8001 )) #绑定本机地址,8001端口 sock.listen( 5 ) #等待客户连接 while True : print "waiting client connection..." connection,address = sock.accept() #接收客户连接请求 print "a client have connected..." while True : try : connection.settimeout( 5 ) #设置超时时间 buf = connection.recv( 1024 ) #接收数据 if buf = = "1" : connection.send( "you have send me 1!welcome to server!" ) elif buf = = "2" : connection.send( "you have send me 2!I have recv!" ) elif buf = = "3" : connection.send( "close the connection!" ) break else : connection.send( "unknow command!" ) except socket.timeout: print "time out" connection.close() print "a client exit..." |
客户器端代码:
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import socket sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.connect(( "127.0.0.1" , 8001 )) import time time.sleep( 2 ) while True : data = raw_input ( "input command:" ); sock.send(data) print sock.recv( 1024 ) if data = = "3" : break sock.close() |
1.首先开两个IDLE,分别打开服务器端和客户器端代码。
2.F5运行服务器端代码,会出现waiting client connection...
3.F5运行客户端代码,会出现input command: ;
4.这时服务器和客户端就连接上了,可以正常的通信啦,如图:
5.再次运行服务器端代码时会出现错误,这时可以通过任务管理器,将其中的pythonw.exe进程结束,重新打开,编译就可以啦!
客户端:
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import socket s = socket.socket() host = socket.gethostname() port = 1234 s.connect((host, port)) print s.recv( 1024 ) |
服务端:
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import socket s = socket.socket() host = socket.gethostname() port = 1234 s.bind((host, port)) s.listen( 5 ) while True : c, addr = s.accept() print 'Got connection from' , addr c.send( 'Thank you for connecting' ) c.close() |
http编程
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from urllib import urlopen |
加上正规表达式
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import re text = webpage.read() m = re.search( '<a href="([^"]+)" .*?>about</a>' , text, re.IGNORECASE) m.group( 1 ) |
urllib
urllib2
一个基于SocketServer的小型服务器例子:
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from SocketServer import TCPServer, StreamRequestHandler >>> class Handler(StreamRequestHandler): def handle( self ): addr = self .request.getpeername() print 'Got connection from' , addr self .wfile.write( 'Thank you for connecting' ) >>> server = TCPServer(('', 1234 ), Handler) >>> server.serve_forever() |
使用SocketServer进行分叉和线程处理
分叉Server:
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from SocketServer import TCPServer,ForkingMinIn, StreamRequestHandler class Server(ForkingMinIn, TCPServer): pass class Handler(StreamRequestHandler): def handle( self ): addr = self .request.getpeername() print 'Got connection from' ,addr self .wfile.write( 'Thank you for connection' ) server = Server(('', 1234 ),Handler) server.serve_forever() |
线程Server:
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from SocketServer import TCPServer, ThreadingMixIn, StreamRequestHandler class Server(ThreadingMixIn, TCPServer): pass class Handler(StreamRequestHandler): def handle( self ): addr = self .request.getpeername() print 'Got connection from' ,addr self .wfile.write( 'Thank you for connecting' ) server = Server(('', 1234 ),Handler) server.serve_forever() |
带有select和pool的异步I/O
select服务:
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import socket, select s = socket.socket() host = socket.gethostname() prot = 1234 s.bind((host,port)) s.listen( 5 ) inputs = [s] while True : rs,ws,es = select.select(inputs,[],[]) for r in rs: if r is s: c, addr = s.accept() print 'Got connection from' ,addr inputs.append(c) else : try : data = r.recv( 1024 ) disconnected = not data except socket.error: disconnected = True if disconnected: print r.getpeername(), 'disconnected' inputs.remove(r) else : print data |
pool服务器:
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import socket, select s = socket.socket() host = socket.gethostname() port = 1234 s.bind((host, port)) fdmap = {s.fileno():s} s.listen( 5 ) p = select.poll() p.register(s) while True : events = p.poll() for fd, event in events: if fd in fdmap: c, addr = s.accept() print 'Got connection from' , addr p.register(c) fdmap[c.fileno()] = c elif event & select.POLLIN: data = fdmap[fd].recv( 1024 ) if not data: print fdmap[fd].getpeername(), 'disconnected' p.unregister(fd) del fdmap[fd] else : print data |
生命不息,奋斗不止,人无再少年!