Simple analysis of UDP socket communication in python (with code)

This article brings you a simple analysis of UDP socket communication in python (with code). It has certain reference value. Friends in need can refer to it. I hope It will help you.

UDPserver.py

import socket
#导入套接字模块

s = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
# - socket.AF_INET：IPV4
# - socket.STREAM：TCP
# - socket.DGRAM：UDP

s.bind(('',25555))
#绑定套接字有效地址和端口
#''空位任何地址 本地的127.0.0.1 和局域网还有自己真实的ip
print('[+] Server Open.....')

while True:
    try:
        data,c_addr = s.recvfrom(1024)
        #一次性接受1024bytes的数据 ，返回一个元组，其中有数据和地址
        #UDP不需要构成连接，直接发送即可
        print('from:',c_addr)
        #c_addr是一个地址,发送消息的客户端的IP和端口的二元组
        print('say：%s'%(data.decode('utf-8')))
        msg = data.decode('utf-8')
        s.sendto(msg.encode('utf-8'),c_addr)
        #发送信息，其中有两个参数，一个是信息，一个是目标地址和端口
    except KeyboardInterrupt:
        break

print('[+] Server Close......')
s.close

UDPclient.py

import socket
#导入套接字模块

c = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
# - socket.AF_INET：IPV4
# - socket.STREAM：TCP
# - socket.DGRAM：UDP

while True:
    try:
        msg = input('>>>')
        if msg == 0:
            #判断输入是否为空 就是直接回车了
            continue
        #UDP不需要构成连接，直接发送即可
        c.sendto(msg.encode('utf-8'),('127.0.0.1',25555))
        #发送消息，其中两个参数,第一个是要发送的信息
        #第二个是发送的ip地址和端口，是一个元组

        data,s_addr = c.recvfrom(1024)

        #c_addr是一个地址,发送消息的客户端的IP和端口的二元组
        print('$: %s'%(data.decode('utf-8')))
    except KeyboardInterrupt:
        break

c.close()

UDP socket model

UDP does not need to be composed Connect and send directly

Server model:

data,c_addr = s.recvfrom(1024)

s.sendto(msg, c_addr)

Messages sent by others are sent directly to the s server socket

data: sent data

c_addr: who sent it

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

s.bind(('',25555))

send recv

sendto recvfrom

They are all blocked

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