[Python network programming] using sockets to write a simple server

Using the socket to write a simple server step parsing the socket object

This step is the same as the last time we used the socket as a client, we need to have a socket connection

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

Set socket options (setsockopt)

Options Introduction
setsockopt (set socket option), parameter format: setsockopt (Level,optname,value)

The relationship of each option:
The 1.level:level setting determines the options that optname can use
2.optname: Determined by level
3.value: Determined by level and optname

Options
Level:sol_socket
When level is sol_socket, the common options that optname can use are:

Bind address and port number (bind socket)

As a server, if you provide access, you must have an IP address and port number for client access.

# 绑定地址为192.168.128.128 端口号为 12345s.bind((‘192.168.128.128‘,12345))

Listening connection (listen)

Listen for the ip:port that bind well

# 5 代表着允许5个连接在队列中等待。s.listen(5)

Accept connection (accepted)

Accept client Connections

Instance

Script writing

[[email protected] network]# cat socket_server.py #!/usr/bin/env python# 导入socket模块import socket# 配置host和porthost = ‘192.168.128.128‘port = 1234# 新建一个socket连接s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)# 设置socket参数s.setsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR,1)# 绑定IP和端口s.bind((host,port))# 监听s.listen(5)# 用while循环一直接受连接,如果不配置while循环，程序执行一次就退出了while 1:                # 接受连接，并把客户端的连接信息赋值给clientsock,和clientaddr        clientsock,clientaddr = s.accept()                # 打印客户端的信息        print "Got connection from",clientsock.getpeername()        # 关闭连接                

Run the program

Viewing the Listening port

[[email protected] ~]# netstat -ant | grep 1234tcp        0      0 192.168.128.128:1234        0.0.0.0:*                   LISTEN      tcp        0      0 192.168.128.128:1234        192.168.128.128:33232       TIME_WAIT   

Client connections

telnet 192.168.128.128 1234

View server-side reactions

[[email protected] network]# python socket_server.py Got connection from (‘192.168.128.1‘, 2839)

[Python network programming] using sockets to write a simple server