python 指南（14）网络编程

TCP编程

• 用TCP协议进行Socket编程在Python中十分简单，对于客户端，要主动连接服务器的IP和指定端口
• 对于服务器，要首先监听指定端口，然后，对每一个新的连接，创建一个线程或进程来处理
• 通常，服务器程序会无限运行下去

一、服务端

import socket
import threading, time

server = socket.socket(family=socket.AF_INET, type=socket.SOCK_STREAM)
server.bind(("127.0.0.1", 9999))
server.listen(5)
print('wait client to connect......')


def dealTcp(sock, addr):
    print('a new socket connect is comming...%s:%s' % addr)
    sock.send(b'welcome')
    while True:
        data = sock.recv(1024)
        time.sleep(1)
        if not data or data.decode('utf-8') == 'exit':
            break
        sock.send(b'hello %s' % data.decode('utf-8').encode('utf-8'))
    sock.close()
    print('connect from %s:%s is closed' % addr)


while True:
    sock, addr = server.accept()
    t = threading.Thread(target=dealTcp, args=(sock, addr))
    t.start()

二、客户端

import socket

client = socket.socket(family=socket.AF_INET, type=socket.SOCK_STREAM)
client.connect(('127.0.0.1', 9999))

print('msg from server:%s' % client.recv(1024).decode('utf-8'))

for name in [b'allen', b'mike', b'helln', ]:
    client.send(name)
    print('msg from server:%s' % client.recv(1024).decode('utf-8'))

client.send(b'exit')
client.close()

三、发送get请求获取网页

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UDP编程

一、服务端

import socket

s = socket.socket(family=socket.AF_INET, type=socket.SOCK_DGRAM)
s.bind(('127.0.0.1', 9999))

while True:
    data, addr = s.recvfrom(1024)
    print('msg from %s:%s--' % addr + data.decode())
    s.sendto(b"hello %s" % data, addr)

二、客户端

import socket, time

s = socket.socket(family=socket.AF_INET, type=socket.SOCK_DGRAM)
for name in [b'allen', b'mikre', b'haha', ]:
    s.sendto(name, ('127.0.0.1', 9999))
    data, addr = s.recvfrom(1024)
    time.sleep(3)
    print('msg from %s:%s--' % addr + data.decode())

s.close()

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