python 网络编程-TCP/UDP

摘抄自：廖雪峰的官方网站：http://www.liaoxuefeng.com/

TCP客户端和服务器端代码：

---

#coding=utf-8

#客户端程序TCP 连接

import socket

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

s.connect(('127.0.0.1',9999))

print(s.recv(1024))

for data in ['Michael','Tracy','Sarah']:

    s.send(data.encode())

    print(s.recv(1024))

s.send(b'exit')

#coding=utf-8

#TCP服务器端程序

import socket

import time

import threading

def tcplink(sock,addr):

    print("accept new connection from %s:%s..." % addr)

    sock.send("Welcom!".encode())

    while True:

        data=sock.recv(1024)

        time.sleep(1)

        if data=='exit' or not data:

            break

        sock.send("hello: ".encode()+data)

    sock.close()

    print("Connection from %s:%s closed." % addr)

s=socket.socket(socket.AF_INET,socket.SOCK_STREAM)  # 创建一个基于ipv4 的TCP协议的socket

s.bind(('127.0.0.1',9999))  #监听端口

s.listen(5)

print("Waiting for connection......")

while True:

    sock,addr=s.accept()

    t=threading.Thread(target=tcplink,args=(sock, addr))

    t.start()
    

运行结果：

Waiting for connection......

accept new connection from 127.0.0.1:60218...

Connection from 127.0.0.1:60218 closed.

b'Welcom!'

b'hello: Michael'

b'hello: Tracy'

b'hello: Sarah'

UDP客户端和服务器端代码：

---

#coding=utf-8

#UDP 客户端代码

import socket

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

for data in ["chenshan","yuanhui","chendianqiang"]:

    s.sendto(data.encode(),('127.0.0.1',9999))

    print(s.recv(1024))

s.close()

#coding=utf-8

#UDP 协议服务器代码

import socket

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

s.bind(('127.0.0.1',9999))

print("Bind UDP on prot:9999")

while True:

    data,addr=s.recvfrom(1024)

    print("Receive from %s:%s"% addr)

    s.sendto("Hello ".encode()+data,addr)

运行结果：

Bind UDP on prot:9999

b'Hello chenshan'

b'Hello yuanhui'

b'Hello chendianqiang'