[网络协议]Python tcp udp

Base On Socket

tcp

• server

from socket import socket,AF_INET,SOCK_STREAM

def echo_server(address,backlog=5):
    sock = socket(AF_INET,SOCK_STREAM)
    sock.bind(address)
    sock.listen(backlog)
    while True:
        #建立连接
        client_sock,client_addr = sock.accept()
        print('Got connection from {}'.format(address))
        while True:
            msg = client_sock.recv(8192)
            #连接已经被close
            if not msg:
                print('The connection is closed')
                break
            client_sock.sendall(msg)
        client_sock.close()
if __name__ == '__main__':
    echo_server(('',20000))

• client

from socket import socket,AF_INET,SOCK_STREAM
s = socket(AF_INET,SOCK_STREAM)
s.connect(('localhost',20000))
s.send(b'Hello.I am the client')
print(s.recv(8192))
s.close(

udp

• server

from socket import SOCK_DGRAM,AF_INET,socket

def time_server(address):
    sock = socket(AF_INET,SOCK_DGRAM)
    sock.bind(address)
    index = 0
    while True:
        msg,addr = sock.recvfrom(8192)
        print('Got message from%s   msg is:%s'%(addr,msg))
        sock.sendto(str(index).encode(),addr)
        index = index + 1
if __name__ == '__main__':
    time_server(('',20000))

• udp client

from socket import socket,AF_INET,SOCK_DGRAM
s = socket(AF_INET,SOCK_DGRAM)
s.sendto(b'Hello I am client',('localhost',20000))
print(s.recvfrom(8192))