Python简单网络编程示例【客户端与服务端】

本文实例讲述了Python简单网络编程。分享给大家供大家参考,具体如下:

内容目录

1. 客户端(client.py)

2. 服务端(server.py)

一、客户端(client.py)

import socket

import sys

port = 70

host = sys.argv[1]

filename = sys.argv[2]

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

s.connect((host, port))

fd = s.makefile("rw", 0)

fd.write(filename + "\n")

for line in fd.readlines():

sys.stdout.write(line)

程序通过socket.socket()建立一个Socket,参数告诉系统需要一个Internet Socket进行TCP通信。接着程序链接远程的主机名,并提供文件名。最后获得响应后在屏幕上打印出来。

测试

python client.py quux.org /

显示

iWelcome to gopher at quux.org! fake (NULL) 0

i fake (NULL) 0

iThis server has a lot of information of historic interest, fake (NULL) 0

ifunny, or just plain entertaining -- all presented in Gopher. fake (NULL) 0

iThere are many mirrors here of rare or valuable files with the fake (NULL) 0

iaim to preserve them in case their host disappears. PLEASE READ fake (NULL) 0

i"About This Server" FOR IMPORTANT NOTES AND LEGAL INFORMATION. fake (NULL) 0

i fake (NULL) 0

0About This Server /About This Server.txt gopher.quux.org 70 +

1Archives /Archives gopher.quux.org 70 +

1Books /Books gopher.quux.org 70 +

1Communication /Communication gopher.quux.org 70 +

iThis directory contains the entire text of the book fake (NULL) 0

i"We the Media: Grassroots Journalism by the People, for the People" fake (NULL) 0

iby Dan Gillmor in various formats. fake (NULL) 0

i fake (NULL) 0

iFeel free to download and enjoy. fake (NULL) 0

1Computers /Computers gopher.quux.org 70 +

1Current Issues and Events (Updated Apr. 23, 2002) /Current gopher.quux.org 70 +

1Development Projects /devel gopher.quux.org 70 +

0Gopher's 10th Anniversary /3.0.0.txt gopher.quux.org 70

1Government, Politics, Law, and Conflict /Government gopher.quux.org 70 +

0How To Help /How To Help.txt gopher.quux.org 70 +

1Humor and Fun /Humor and Fun gopher.quux.org 70 +

1Index to Quux.Org /Archives/index gopher.quux.org 70

1Internet /Internet gopher.quux.org 70 +

1Other Gopher Servers /Software/Gopher/servers gopher.quux.org 70

1People /People gopher.quux.org 70 +

1Reference /Reference gopher.quux.org 70 +

1Software and Downloads /Software gopher.quux.org 70 +

1The Gopher Project /Software/Gopher gopher.quux.org 70

0What's New /whatsnew.txt gopher.quux.org 70 + 

二、服务端(server.py)

# coding: utf-8

import socket

host = ''

port = 51421

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

s.bind((host, port))

s.listen(1) #每次最多只有一个等候处理

print "Server is running on port %d; press Ctrl-C to terminate." %port

while 1:

clientsock, clientaddr = s.accept()

clientfile = clientsock.makefile('rw', 0)

clientfile.write("Welcome, " + str(clientaddr) + "\n")

clientfile.write("Please enter a string: ")

line = clientfile.readline().strip()

clientfile.write("You entered %d characters. \n" %len(line))

clientfile.close()

clientsock.close()

建立一个socket,设置成可复用的(reusable),绑定端口号51421(可选大于1024的任一值),调用listen()函数,开始等待来自客户端的请求,同时设定最多只有一个等候处理的链接。

主循环对a.accept()函数调用开始,程序连接一个客户端后立马停止,接收用户的输入。

运行一个例子

首先运行server.py

python server.py

另开一个终端,连接localhost的51421端口。 

jihite@ubuntu:~/web$ telnet localhost 51421

Trying 127.0.0.1...

Connected to localhost.

Escape character is '^]'.

Welcome, ('127.0.0.1', 59853)

Please enter a string: mm

You entered 2 characters.

Connection closed by foreign host.

更多关于Python相关内容感兴趣的读者可查看本站专题:《Python Socket编程技巧总结》、《Python函数使用技巧总结》、《Python字符串操作技巧汇总》、《Python入门与进阶经典教程》及《Python文件与目录操作技巧汇总》

希望本文所述对大家Python程序设计有所帮助。

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