Python9-网络编程2-day31

基于UDP协议的socket

#server
import socket
sk = socket.socket(type=socket.SOCK_DGRAM)
sk.bind(('127.0.0.1',8080))
msg,addr = sk.recvfrom(1024)
print(msg.decode('utf-8'))
sk.sendto(b'bye',addr)
sk.close()

#client
import socket
sk = socket.socket(type=socket.SOCK_DGRAM)
ip_port = ('127.0.0.1',8080)
sk.sendto(b'hellog',ip_port)
ret,addr = sk.recvfrom(1024)
print(ret.decode('utf-8'))

# udp的server 不需要进行监听也不需要建立连接
# 在启动服务之后只能被动的等待客户端发送消息过来
# 客户端发送消息的同时会自带地址信息
# 消息回复的时候，不需要发送信息，还需要把对方的地址发送过去
QQ的UPD聊天代码

#server
import socket
sk = socket.socket(type=socket.SOCK_DGRAM)
sk.bind(('127.0.0.1',8080))
while True:
    msg,addr = sk.recvfrom(1024)
    print(addr)
    print(msg.decode('utf-8'))
    info = input('>>>>>>>').encode('utf-8')
    sk.sendto(info,addr)

sk.close()

#tim

import socket
sk = socket.socket(type=socket.SOCK_DGRAM)
ip_port = ('127.0.0.1',8080)
while True:
    info = input('Tim: ')
    info = ('33[32m来自Tim的消息：%s33[0m'%info).encode('utf-8')
    sk.sendto(info,ip_port)
    msg,addr = sk.recvfrom(1024)
    print(msg.decode('utf-8'))
sk.close()

#tigger
import socket
sk = socket.socket(type=socket.SOCK_DGRAM)
ip_port = ('127.0.0.1',8080)
while True:
    info = input('Tigger: ')
    info = ('33[34m来自Tigger的消息：%s33[0m'%info).encode('utf-8')
    sk.sendto(info,ip_port)
    msg,addr = sk.recvfrom(1024)
    print(msg.decode('utf-8'))
sk.close()

黏包问题

import subprocess
ret = subprocess.Popen('dir',shell=True,stdout=subprocess.PIPE,stderr=subprocess.PIPE)
print('stdout: ',ret.stdout.read().decode('gbk'))
print('stderr: ',ret.stderr.read().decode('gbk'))