python 网络通讯 服务器端代码demo，能够同时处理多个客户端的连接请求

from socket import *
import threading
from datetime import *
import time
import signalserver=socket(AF_INET,SOCK_STREAM)
server.setsockopt(SOL_SOCKET,SO_REUSEADDR,1)
server.bind(("",4000))
server.listen(10)
print('waiting to connecting from clients')def client_thread(client_socket,client):
global connect_count
global is_exit
while not is_exit:
data=client_socket.recv(1024) # when return value is b'',the connect with client is close
if data !=b'':
print(str(datetime.now()),' ',client[0],':',data)
client_socket.send(bytes('数据接收成功！', encoding = "utf8") )
if data=="over" or data ==b'':
if mutex_num.acquire(1):
connect_count=connect_count-1
print("client",client[0],"shutdown,current connect count is",connect_count)
mutex_num.release()
client_socket.close()
breakdef handle(signum, frame):
global is_exit
is_exit = True
print("receive a signal {0},is_exit={1}").format(signum, is_exit)signal.signal(signal.SIGINT, handle)
signal.signal(signal.SIGTERM, handle)mutex_num = threading.Lock()connect_count = 0
max_connect_num = 10
is_exit = False
thread_set = []while not is_exit:
client_socket, client = server.accept()
if mutex_num.acquire(1):
connect_count = connect_count + 1
print("receive new connect from:", client, "current connect count :", connect_count)
mutex_num.release()
t = threading.Thread(target=client_thread, args=(client_socket, client))
t.setDaemon(True)
t.start()
thread_set.append(t)while (1):
isalive = False
for t in thread_set:
flag = t.is_alive()
isalive = isalive or flag
if not isalive:
breakserver.close()