python 网络编程常用代码段

Python  /  管理员 发布于 7年前   208

服务器端代码:

# -*- 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：

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":    breaksock.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：

import sockets=socket.socket()host = socket.gethostname()port = 1234s.connect((host, port))print s.recv(1024)

服务端：

import sockets = socket.socket()host = socket.gethostname()port = 1234s.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

from urllib import urlopenwebpage = urlopen('http://www.python.org')

加上正规表达式

import retext = webpage.read()m = re.search('<a href="https:/article/([^"]+)" .*?>about</a>', text, re.IGNORECASE)m.group(1)

urllib
urllib2

一个基于SocketServer的小型服务器例子：

from SocketServer import TCPServer, StreamRequestHandler>>> class Handler(StreamRequestHandler):def handle(self):addr = self.request.getpeername()print 'Got connection from', addrself.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:

from SocketServer import TCPServer,ForkingMinIn, StreamRequestHandlerclass Server(ForkingMinIn, TCPServer):passclass 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:

from SocketServer import TCPServer, ThreadingMixIn, StreamRequestHandlerclass Server(ThreadingMixIn, TCPServer):passclass 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：

import socket, selects = socket.socket()host = socket.gethostname()prot = 1234s.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：

import socket, selects = socket.socket()host = socket.gethostname()port = 1234s.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

Twisted网络框架

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