python 網路程式設計常用程式碼

伺服器端程式碼:

# -*- 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..."

#用戶器端程式碼：

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()

##

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

1.先開兩個IDLE，分別開啟伺服器端和客戶器端程式碼。

2.F5執行伺服器端程式碼，會出現waiting client connection...

3.F5執行客戶端程式碼，會出現input command:;

4.這時伺服器和用戶端就連線上了，可以正常的通訊啦，如圖：

5.再次運行伺服器端程式碼時會出現錯誤，這時可以透過任務管理器，將其中的pythonw .exe進程結束，重新打開，編譯就可以啦！

客戶端：

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()

服務端：

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

http程式設計

import re
text = webpage.read()
m = re.search(&#39;<a href="([^"]+)" .*?>about</a>&#39;, text, re.IGNORECASE)
m.group(1)

加上正規表示式


#

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()

urllib

urllib2

一個基於SocketServer的小型伺服器範例：

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()

使用SocketServer進行分叉和執行緒處理

分叉Server:

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()

線程Server:

#

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

帶有select和pool的非同步I/O

select服務：

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

pool伺服器：

rrreee

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