网络编程_tcp与dup协议简单应用

老师的博客：http://www.cnblogs.com/Eva-J/articles/8066842.html 计算机网络基础

　　　　　　　：http://www.cnblogs.com/Eva-J/articles/8244551.html 网络编程

基于TCP协议的简单的发消息

server

import socket
from socket import SOL_SOCKET,SO_REUSEADDR
tool=socket.socket()
tool.setsockopt(SOL_SOCKET,SO_REUSEADDR,1)
tool.bind(('192.168.43.155',8891))#IP port
tool.listen()#监听连接
connect,address=tool.accept()#接受client的信息，建立三次握手
get=connect.recv(1024).decode('utf-8')#接受信息
print(get)
connect.send(bytes('you can go oher place'.encode('utf-8')))
get = connect.recv(1024).decode('utf-8')
print(get)
connect.close()

注意，当建立三次握手后，所有的操作前缀都是你拿到的那个链接，而下面的client的前缀都是自己的那个前缀

client

import socket
client=socket.socket()
client.connect(('192.168.43.155',8891))#建立三次握手
client.send(bytes('i am coming'.encode('utf-8')))#发信息
get = client.recv(1024).decode('utf-8')#接受信息
print(get)
client.send(bytes('i only say goodbye'.encode('utf-8')))
client.close()

 TCP协议是，建立连接时，谁先发送消息都可以，但是注意的是，必须是一发一收，一发一收，按照顺序来。serve接受时，不必写入地址，因为tcp协议是面向

的协议

基于DUP协议

server

import socket
ip_port=('192.168.43.155',8898)
server=socket.socket(type=socket.SOCK_DGRAM)
server.bind(ip_port)
message,address=server.recvfrom(1024)
set = message.decode('utf-8')
print(set)
print('client address:',address)
server.sendto(bytes('i know you coming'.encode('utf-8')),address)
message,address=server.recvfrom(1024)
print(message.decode('utf-8'))
print('client address:',address)
server.close()

client

import socket
ip_port=('192.168.43.155',8898)
client=socket.socket(type=socket.SOCK_DGRAM)
client.sendto(bytes('i am coming'.encode('utf-8')),ip_port)
message,address=client.recvfrom(1024)
print('sever address:',address)
print(message.decode('utf-8'))
client.sendto(bytes('i am going'.encode('utf-8')),address)
client.close()

 udp 协议不必遵循发一收一，但是发几条信息得收几条信息，发送信息是和接受信息时必需带上地址