Python简单网络编程示例【客户端与服务端】_Python

Python简单网络编程示例【客户端与服务端】

2020-11-12 00:45jihite Python

这篇文章主要介绍了Python简单网络编程,详细介绍了客户端与服务端的具体实现技巧与相关注意事项,需要的朋友可以参考下

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

1	`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

1	`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.