Python 网络编程 （一）

1、socket() 模块函数

创建套接字语法：

  socket(socket_family,  socket_type,  protocol = 0)
  socket_family 用 AF_INET 表示网络连接
  socket_type 是 SOCKET_STREAM (为创建 TCP 套接字)或 SOCKET_DGRAM（为创建 UDP 套接字）
  protocol 通常省略，默认是 0

为创建 TCP／IP 连接 ，可以用以下方式
tcpSock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

为创建 UDP／IP 连接，可以用以下方式
udpSock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

2、套接字对象（内置）方法

3、创建 TCP 服务端

from socket import *
from time import ctime


host = ''
port = 8433
address = (host, port)
bufsize = 1024

tcpServer = socket(AF_INET, SOCK_STREAM)
tcpServer.bind(address)
tcpServer.listen()

while True:
    print('waiting for connection ...')
    tcpCliSock, Addr = tcpServer.accept()
    print('connected from:', Addr)

    while True:
        data = tcpCliSock.recv(bufsize)
        if not data:
            break
        tcpCliSock.send(ctime().encode('utf-8'))

    tcpCliSock.close()

tcpServer.close()

4、创建 TCP 客户端

from socket import *
from time import ctime


host = 'localhost'
port = 8433
address = (host, port)
bufsize = 1024

tcpClient = socket(AF_INET, SOCK_STREAM)
tcpClient.connect(address)

while True:
    print('client is connecting')
    data = '324242'
    tcpClient.send(data.encode('utf-8'))
    data = tcpClient.recv(bufsize)
    if not data:
        break;
    print(data.decode('utf-8'))

tcpClient.close()

5、创建 UDP 服务端

from socket import *
from time import ctime

host = ''
port = 3528
address = (host, port)
bufsize = 1024

udpSoc = socket(AF_INET, SOCK_DGRAM)
udpSoc.bind(address)

while True:
    print('udpServer start ')
    udpSockServer, addr =  udpSoc.recvfrom(bufsize)
    print('udpServer add : ', addr)
    udpSoc.sendto(ctime().encode('utf-8'), addr)

udpSoc.close()

6、创建 UDP 客户端

from time import ctime
from socket import *


host = 'localhost'
port = 3528
address = (host, port)
bufsize = 1024

udpSocClient = socket(AF_INET, SOCK_DGRAM)

while True:
    print('udpClient start')
    udpSocClient.sendto('dadasda'.encode('utf-8'), address)
    data, addr = udpSocClient.recvfrom(bufsize)
    if not data:
        break
    print(data)

udpSocClient.close()