Directly usable python Socket multiple connections

 

1 Environment:

python3 + Win10
function 1. Use sub-threads and handle each TCP client connection
function 2. Client connection and disconnection have prompt
function 3. Data return

2 Server source code:

# coding=utf-8
# !/usr/bin/env python
 
 
from socket import *
from time import ctime
import threading
import time
 
HOST = '192.168.10.51'
PORT = 1234
BUFSIZ = 1024
ADDR = (HOST, PORT)
 
tcpSerSock = socket(AF_INET, SOCK_STREAM)
tcpSerSock.bind(ADDR)
tcpSerSock.listen(5)
socks = []  # 放每个客户端的socket

print('tcp server started. IP is %s, port: %d' % (HOST, PORT)) 
 
def clientthread_handle():
    while True:
        for s in socks:
            try:
                data = s.recv(BUFSIZ)  # 到这里程序继续向下执行
                if len(data)==0:
                    print("另一端断开了连接")
                    s.close()
                    socks.remove(s)
                    continue
                else:
                    str2send = ('[%s],%s' % (ctime(), data))
                    s.send(str2send.encode())
            except Exception as e:
                continue
 
t = threading.Thread(target=clientthread_handle)  # 子线程
if __name__ == '__main__':
    t.start()
    print( 'waiting for connecting...')
    while True:
        clientSock, addr = tcpSerSock.accept()
        print(  'connected from:', addr)
        clientSock.setblocking(0)
        socks.append(clientSock)
 

 When using, just modify the IP address and port of the running host.

3 Client test program:

TCP/UDP network debugging assistant (PC version), http://wiki.ai-thinker.com/_media/tools/tcpudpdbg.zip

4 Effect:

Note: When using it, it is found that if the client uses a fixed port, it cannot reconnect within 30 seconds after disconnection. After this time, press connect again.

5 Reference:

[1] How does Python socket determine that the connection is disconnected, https://blog.csdn.net/qq_36145663/article/details/100543168?depth_1-utm_source=distribute.pc_relevant.none-task&utm_source=distribute.pc_relevant.none-task

[2] Python Socket network programming, https://www.cnblogs.com/hazir/p/python_socket_programming.html

[3] Python multithreading module: How to use threading (parameter transfer), https://blog.csdn.net/chpllp/article/details/54381141