python之路----TCP与UDP

import socket
#tcp协议
sk = socket.socket() # 买手机 创建一个socket对象
sk.bind(('127.0.0.1',8080)) # 给server端绑定一个ip和端口
sk.listen() # py3.4
while True:
conn,addr = sk.accept() # 获取到一个客户端的连接， 已经完成了三次握手建立了一个连接
# 阻塞
while True:
msg = conn.recv(1024).decode('utf-8') # 阻塞，直到收到一个客户端发来的消息
print(msg)
if msg == 'bye':break
info = input('>>>')
if info == 'bye':
conn.send(b'bye')
break
conn.send(info.encode('utf-8')) # 发消息
conn.close() # 关闭连接
sk.close() # 关闭socket对象，如果不关闭，还能继续接收
# server client1 建立了长连接
# client2

import socket
sk = socket.socket()
sk.connect(('127.0.0.1',8080))
while True:
msg = input('>>>')
if msg == 'bye':
sk.send(b'bye')
break
sk.send(msg.encode('utf-8'))
ret = sk.recv(1024).decode('utf-8')
if ret == 'bye':break
print(ret)
sk.close()

import socket
sk = socket.socket()
sk.connect(('127.0.0.1',8080))
while True:
msg = input('client2:>>>')
if msg == 'bye':
sk.send(b'bye')
break
sk.send(('client2 :'+msg).encode('utf-8'))
ret = sk.recv(1024).decode('utf-8')
if ret == 'bye':break
print(ret)
sk.close()

import socket
sk = socket.socket(type=socket.SOCK_DGRAM) #DGRAM datagram
sk.bind(('127.0.0.1',8080)) #只有服务端有的msg,addr = sk.recvfrom(1024)
print(msg.decode('utf-8'))
sk.sendto(b'bye',addr)sk.close()

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

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()

import socket
sk = socket.socket(type=socket.SOCK_DGRAM)
ip_port = ('127.0.0.1',8080)
while True:
info = input('tiger ：')
info = ('\033[34m来自tiger的消息 ：%s\033[0m'%info).encode('utf-8')
sk.sendto(info,ip_port)
msg,addr = sk.recvfrom(1024)
print(msg.decode('utf-8'))sk.close()

import socket
sk = socket.socket(type=socket.SOCK_DGRAM)
ip_port = ('127.0.0.1',8080)
while True:
info = input('二哥 ：')
info = ('\033[32m来自二哥的消息 ：%s\033[0m'%info).encode('utf-8')
sk.sendto(info,ip_port)
msg,addr = sk.recvfrom(1024)
print(msg.decode('utf-8'))sk.close()

import time
import socket
sk = socket.socket(type=socket.SOCK_DGRAM)
sk.bind(('127.0.0.1',8090))
while True:
strf,addr = sk.recvfrom(1024)
strf = strf.decode('utf-8')
res = time.strftime(strf).encode('utf-8')
sk.sendto(res,addr)
sk.close()

import socket
sk = socket.socket(type=socket.SOCK_DGRAM)
addr = ('127.0.0.1',8090)
info = input('>>>').encode('utf-8')
sk.sendto(info,addr)
ret,addr = sk.recvfrom(1024)
print(ret.decode('utf-8'))sk.close()