python socket 编程之三：长

#coding=utf-8
__author__ = '药师Aric'
'''
server端
长连接，短连接，心跳
'''
import socket
BUF_SIZE = 1024
host = 'localhost'
port = 8083
 
server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server.bind((host, port))
server.listen(1) #接收的连接数
client, address = server.accept() #因为设置了接收连接数为1，所以不需要放在循环中接收
while True: #循环收发数据包，长连接
    data = client.recv(BUF_SIZE)
    print(data.decode()) #python3 要使用decode
    # client.close() #连接不断开，长连接

#coding=utf-8
__author__ = '药师Aric'
'''
client端
长连接，短连接，心跳
'''
import socket
import time
host = 'localhost'
port = 8083
client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
client.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1) #在客户端开启心跳维护
client.connect((host, port))
while True:
    client.send('hello world\r\n'.encode())
    print('send data')
    time.sleep(1) #如果想验证长时间没发数据，SOCKET连接会不会断开，则可以设置时间长一点