Python writes socket server and client

The main module used this time is the socket module, where you can find the socket () function, which is used to create a socket object. Sockets also have their own set of methods that can implement socket-based network communication.

Socket () module function

To create a socket, you must use the Socket.socket () function with the following syntax:

socket (socket_family,socket_type,protocol=0)

Where socket_family is Af_unix (file-based) or af_inet (network-oriented), Socket_type is Sock_stream (TCP) or Sock_dgram (UDP), protocol is usually omitted, default is 0

Example: Create a TCP/IP socket:

Tcpsock = Socket.socket (socket.af_inet,socket. SOCK_STREAM)

To create a UDP/IP socket:

Udpsock = Socket.socket (socket.af_inet,socket. SOCK_DGRAM)

Create a TCP timestamp server and client

#  Server from socket import * from time import ctimehost =  "                                            #  NULL indicates that any available address can be used port = 21567                                        #  Listening Port bufsiz =  1024                                       #  buffer size addr =  (host,port) tcpsersock = socket (Af_inet,sock_stream)           #  assigning TCP server sockets Tcpsersock.bind (addr)                                #  Bind server address Tcpsersock.listen (5)                                 #  Turn on TCP listener call try:    while true:                                     #  into the loop, waiting for the client to connect          print  ' Waiting for connection '          tcpclisock,addr = tcpsersock.accept ()      #   Connection Request         print  ' ... connection from: ',addr         while True:            data  = TCPCLISOCK.RECV (bufsiz)         #  get Messages      if not data:                           #  message is empty, exit          break    tcpclisock.send (' [%s] %s '% (CTime (), data) )  #  message exists, then add time stamp and return Data         tcpclisock.close ()      except KeyboardInterrupt:                          # ctrl+c exit      print  ' you&Nbsp;have ctrl+c,quit now '     tcpsersock.close () 

#  client from socket import *host =  ' localhost '                                   # host,port is the server hostname and port port = 21567bufsiz =  1024addr =  (Host,port) tcpclisock = socket (af_inet,sock_stream)            #  assigning TCP client sockets Tcpclisock.connect (addr)                             #  actively call and connect to the server try:    while true:         data = raw_input (' >  ')                      #  Input String          if not data:    break         Tcpclisock.send (data)                       #  Send to Server         data  = TCPCLISOCK.RECV (Bufsiz)             #   Get Server Data         if not data:     break        print dataexcept keyboardinterrupt:     print  ' You have ctrl+c,quit now '     tcpclisock.close ()

Executing the TCP server and client

# client [[email protected] python]# python tcp_client.py > Hi[thu 11:11:04] hi> welcome! [Thu 11:11:10] Welcome!>

# server-side [[email protected] python]# python tcp_server.py waiting for connection......connection from: (' 127.0.0.1 ', 52900) W Aiting for connection ...

Create a UDP timestamp server and client

#  Server from socket import * from time import ctimehost =  " port = 21567bufsiz = 1024addr =  (Host,port) udpsersock = socket (AF_INET , Sock_dgram)             #  Assigning UDP server sockets Udpsersock.bind (addr)                                #  UDP is not connected, so there is no need to listen try:    while true:         print  ' Waiting for message ... '         data,addr =  udpsersock.recvfrom (bufsiz)     #  get messages, process and return clients          udpsersock.sendto (' [%s] %s '% (CTime (), data), addr)          print  ' ... received fRom and return to: ',addrexcept keyboardinterrupt:    print  ' you  have ctrl+c,quit now '     udpsersock.close ()

#  client from socket import * host =  ' localhost ' port = 21567bufsiz  = 1024addr =  (Host,port) udpclisock = socket (Af_inet,sock_dgram)             #  assigning UDP sockets try:                             while True:                                     #  works almost like a TCP client         data  = raw_input (' >  ')          if not data:     break        udpclisock.sendto (DATA,ADDR)          data,addr = udpclisock.recvfrom (Bufsiz)          if not data:            break         print dataexcept KeyboardInterrupt:     print  ' You have ctrl+c,quit now '     udpclisock.close ()

Execution results

# client [[email protected] python]# python udp_client.py > 123[thu 11:23:01] 123> hello[thu 11 11:23:04 ] Hello>

# server-side [[email protected] python]# python udp_server.py waiting for message......received from and return to: (' 127.0.0.1 ', 55532) waiting for message......received by and return to: (' 127.0.0.1 ', 55532) waiting for message ...

Python writes socket server and client