python tcp、udp网络编程

1，tcp

tcp服务端：

import socket
import threading
import time
s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
s.bind(('127.0.0.1',9999))
s.listen(5)
print('Waiting for connection...')

def tcplink(sock,addr):
    print('Accept new connect from %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(('hello,%s' % data.decode('utf-8')).encode('utf-8'))
    sock.close()
    print('connection from %s:%s close.' % addr)
while True:
    sock,addr = s.accept()
    t = threading.Thread(target=tcplink, args = (sock,addr))
    t.start()

tcp 客户端

import socket
s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)  # socket.AF_INET ipv4,socket.SOCK_STREAM tcp连接
s.connect(('127.0.0.1',9999))
print(s.recv(1024).decode('utf-8'))
for data in [b'michael',b'tracy',b'sarah']:
    s.send(data)
    print(s.recv(1024).decode('utf-8'))
s.send(b'exit')
s.close()

2，udp

udp服务端：

import socket
s = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)   #udp
s.bind(('127.0.0.1',9999))
print('build udp on 9999....')
while True:
    data,addr = s.recvfrom(1024)
    print('received from %s:%s.' % addr)
    s.sendto(b'hello,%s!' % data,addr)

udp客户端：

import socket
s = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
for data in [b'mike',b'jack',b'rose']:
    s.sendto(data,('127.0.0.1',9999))
    print(s.recv(1024).decode('utf-8'))
s.close()