python网络编程之socket

网络编程之socket OSI七层模型 TCP/IP四层模型： 应用层–>http,ftp,telnet,smtp 传输层–>tcp/udp 网际层（ip）–>ip数据包分组，路由选择 网络接口层–>数据帧发送接收，处理物理信号

socket 套接字是对TCP/IP网络模型封装，可以简单的实现计算机网络中两台主机的通信 常用的地址簇:family socket.AF_INET ipv4 socket.AF_INET6 ipv6 常用的传输协议类型type socket.SOCK_STREAM TCP socket.SOCK_DGRAM UDP TCP传输：面向连接的、可靠的、字节流的传输协议 UDP传输：无连接、不可靠的、数据报的传输

socket实现基于TCP的循环服务模型

#server.py import socket #instantiate server socket server=socket.socket(family=socket.AF_INET,type=socket.SOCK_STREAM) #release the port as soon as the programme is closed on server side server.setsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR,1) #bind server.bind(("localhost",8000)) server.listen(5) while True: print("waiting a connection...") conn,addr=server.accept() print("connection from:",addr) #recv data bytes while True: data=conn.recv(1024) if not data: print("client disconnect") conn.close() break print("recv data:",data.decode()) conn.send(b"OK") #client.py import socket client=socket.socket(family=socket.AF_INET,type=socket.SOCK_STREAM) client.connect(("localhost",8000)) while True: msg=input("input msg>>") if not msg: continue elif msg in ("exit","quit","q"): break else: client.send(msg.encode()) data=client.recv(1024) print(data.decode()) client.close()

socket实现基于UDP的循环服务模型

#server.py import socket server=socket.socket(family=socket.AF_INET,type=socket.SOCK_DGRAM) server.bind(("localhost",8000)) while True: try: data,addr=server.recvfrom(1024) print("recv data:",data.decode()) server.sendto(b"OK",addr) except KeyboardInterrupt: break server.close() #client.py import socket client=socket.socket(family=socket.AF_INET,type=socket.SOCK_DGRAM) ADDR=("localhost",8000) while True: msg=input(">>") if not msg: continue elif msg in ("exit","quit","q"): break else: client.sendto(msg.encode(),ADDR) data,addr=client.recvfrom(1024) print(data.decode()) client.close()