python3 利用socket和i/o多路复用实现简易群聊服务器

服务端

import socket
import select

# i/o复用实例，利用操作系统对i/o流的阻塞，单线程多人群聊服务器
ss = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
ss.bind(('127.0.0.1', 5985))
ss.listen(10)
readlist = [ss]     # 读监听列表，ss是服务器连接
writelist = []      # 写监听列表
msg_content = ""    # 用来存消息内容
print('服务器已启动')
while True:
    # i/o复用监听，rlist读事件列表，wlist写事件列表，xlist错误列表，readlist所有读监听连接，rlist监听到的读事件连接
    rlist, wlist, xlist = select.select(readlist, writelist, [])    # select监听1024个，poll监听无限个,epoll无限个(Linux，web)
    for r in rlist:
        if r is ss:     # 新的客户端连入执行
            conn, addr = r.accept()
            readlist.append(conn)   # 把新的客户端加入读监听列表
        else:   # 客户端发消息执行
            msg = r.recv(1024)
            msg_content = str(r.fileno())+':'+msg.decode('utf-8')
            if len(msg) == 0:
                r.close()
                readlist.remove(r)      # 客户端无消息发送删除连接
            for i in readlist:         # 把除了ss服务器的，其余所有连接放入写列表
                if i is not ss:
                    writelist.append(i)

    for w in wlist:
        msg_split = msg_content.split(":")      # 分割字符串
        w.send(("编号为{}说:{}".format(msg_split[0], msg_split[1])).encode('utf-8'))    # 发送消息
        writelist.remove(w)     # 发送完删除写连接

客户端

import socket
import threading

c = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
c.connect(('127.0.0.1', 5985))
def recv_msg():
    while True:
        msg = c.recv(10000).decode('utf-8')
        print(msg)

st = threading.Thread(target=recv_msg)
st.start()

def send_msg():
    while True:
        msg = input('输入消息：')
        c.send(msg.encode('utf-8'))

if __name__ == '__main__':
    send_msg()

客户端需要多复制几份运行