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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1 2	from urllib import urlopen webpage = urlopen('http://www.python.org')

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