最简单的网络通讯

最简单的网络通讯

server端：

import socket

sk = socket.socket()          # 创建一个server端的对象
sk.bind(('127.0.0.1',9001))  # 给server端绑定一个地址
sk.listen()                   # 开始监听(可以接收)客户端给我的连接了

conn,addr = sk.accept()  # 建立连接 conn是连接
conn.send(b'hello')
msg = conn.recv(1024)
print(msg)
conn.close()     # 关闭连接

sk.close()

client端：

import socket

sk = socket.socket()
sk.connect(('127.0.0.1',9001))


msg = sk.recv(1024)
print(msg)
sk.send(b'byebye')

sk.close()

tcp 和多个客户端通讯

#server端
import socket
sk = socket.socket()
sk.bind(('127.0.0.1',8008))
sk.listen()

while True:
    conn, addr = sk.accept()
    print('conn',conn)
    while True:
        g = input('请输入：')
        conn.send(g.encode('utf-8'))
        if g.upper() == 'Q':
            break
        msg = conn.recv(1024).decode('utf-8')
        print(msg)
    conn.close()
sk.close()
#-------------------------
#Client端
import  socket
sk = socket.socket()
sk.connect(('127.0.0.1',8008))
while True:
    msg = sk.recv(1024).decode('utf-8')
    if msg.upper() == 'Q':break
    print(msg)
    g = input('>>>')
    sk.send(g.encode('utf-8'))
    if g.upper() == 'Q':break
sk.close()

UDP协议通讯

#udp例子
#server端------------------
import socket
sk = socket.socket(type=socket.SOCK_DGRAM)
sk.bind(('127.0.0.1',8001))
while True:
    msg,addr = sk.recvfrom(1024)
    print(msg.decode('utf-8'))
    msg_send = input('>>>')
    if msg_send.upper() == 'Q':break
    sk.sendto(msg_send.encode('utf-8'),addr)


#client端  ------------------  
import socket
sk = socket.socket(type=socket.SOCK_DGRAM)
server = ('127.0.0.1',8001)
while True:
    msg = input('>>>')
    if msg.upper() == 'Q':break
    sk.sendto(msg.encode('utf-8'),server)
    msg2 = sk.recv(1024).decode('utf-8')
    if msg2.upper() =='Q':break
    print(msg2)