Python 网络编程（一）

TCP/IP 之间socket 之间的通信 通过代码 来比较两者之间的区别

socket(socket_family,socket_type,protocol=0)

tcpSock=socket.socket(socket.AF_INET,socket.SOCK_STREAM) --->创建tcp的套接字
udpSock=socket.soceket(socket.AF_INET,socket.SOCK_DGRAM)--->创建udp的套接字

先看TCP/Server

from socket import *
from time import ctime
HOST=''
PORT=770
BUFSIZ=1024
ADDR=(HOST,PORT)
tcpSerSock=socket(AF_INET,SOCK_STREAM)
tcpSerSock.bind(ADDR)
tcpSerSock.listen(5)

while True:
    print 'waiting for connectiong....'
    tcpCliSock=tcpSerSock.accept()
    print '....connected form:', tcpCliSock

    while True:
                data=tcpCliSock.recv(BUFSIZ)
                if not data:
                        break
                tcpCliSock.send('[%s] %s' % (ctime(),data))
                tcpCliSock.close()
                
tcpSerSock.close()

Client

from socket import *

HOST='localhost'
PORT=770
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()

记录一下UDP/IP 协议下的简单通信

Client端

from socket import *

HOST='localhost'
PORT=700
BUFSIZ=1024
ADDR=(HOST,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()
udpCliSock.close()

服务端

from socket import *
from time import ctime

HOST=''
PORT=700
BUFSIZ=1024
ADDR=(HOST,PORT)
 
udpSerSock=socket(AF_INET,SOCK_DGRAM)
udpSerSock.bind(ADDR)
 
while True:
    print 'waiting for meassage'
    data,addr=udpSerSock.recvfrom(BUFSIZ)
    udpSerSock.sendto('[%s] %s' %(ctime(),data),addr)
    print '......recevied from and returned to:',addr

updSerSock.close()