python之路----TCP与UDP

TCP

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()

UDP

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()

UDP协议实现qq聊天

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 = ('33[34m来自tiger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()

import socket
sk = socket.socket(type=socket.SOCK_DGRAM)
ip_port = ('127.0.0.1',8080)
while True:
    info = input('二哥 ：')
    info = ('33[32m来自二哥的消息 ：%s33[0m'%info).encode('utf-8')
    sk.sendto(info,ip_port)
    msg,addr = sk.recvfrom(1024)
    print(msg.decode('utf-8'))

sk.close()

UDP实现系统时间同步

# 提供服务
# 接收信息 时间的格式
# 将我的时间转换成 接受到的格式
# 发回给客户端

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()