1、唠唠叨叨
最近又回顾了下Websocket，发现已经忘的七七八八了。于是用js写了客户端，用python写了服务端，来复习一下这方面的知识。
2、先看一下效果吧
2.1、效果1（一个客户端连上服务的并发送消息）
2.2、效果2（另一个客户端连上服务的并发送消息）
2.3、效果3（服务的收到客户端的全部消息并返回消息）
2.4、效果4（一个客户端掉线并不影响其它socket连接）
2.5、效果5（列取全部连接客户端对象和当前发消息的客户端对象）
3、核心代码
3.1、Python
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代码：
#! -*- coding: utf-8 -*-"""Author: ZhenYuSha
Create Time: 2019-1-14
Info: Websocket 的使用示例"""import asyncioimport websockets
websocket_users = set()# 检测客户端权限，用户名密码通过才能退出循环asyncdef check_user_permit(websocket):
print("new websocket_users:", websocket)
websocket_users.add(websocket)
print("websocket_users list:", websocket_users)
while True:
recv_str = await websocket.recv()
cred_dict = recv_str.split(":")
ifcred_dict[0] =="admin"andcred_dict[1] =="123456":
response_str ="Congratulation, you have connect with server..." await websocket.send(response_str)
print("Password is ok...")
return True
else:
response_str ="Sorry, please input the username or password..."print("Password is wrong...")
await websocket.send(response_str)# 接收客户端消息并处理，这里只是简单把客户端发来的返回回去asyncdef recv_user_msg(websocket):
while True:
recv_text = await websocket.recv()
print("recv_text:", websocket.pong, recv_text)
response_text = f"Server return: {recv_text}"print("response_text:", response_text)
await websocket.send(response_text)# 服务器端主逻辑asyncdef run(websocket, path):
while True:
try:
await check_user_permit(websocket)
await recv_user_msg(websocket)
except websockets.ConnectionClosed:
print("ConnectionClosed...", path)# 链接断开print("websocket_users old:", websocket_users)
websocket_users.remove(websocket)
print("websocket_users new:", websocket_users)
breakexcept websockets.InvalidState:
print("InvalidState...")# 无效状态breakexcept Exception as e:
print("Exception:", e)if__name__=='__main__':
print("127.0.0.1:8181 websocket...")
asyncio.get_event_loop().run_until_complete(websockets.serve(run, "127.0.0.1", 8181))
asyncio.get_event_loop().run_forever()
3.2、Html（JS）
代码：
var socket;
if("WebSocket"in window) {
var ws = new WebSocket("ws://127.0.0.1:8181/test");
socket = ws;
ws.onopen = function() {
console.log('连接成功');
alert("连接成功, 请输入账号和密码");
};
ws.onmessage = function(evt) {
var received_msg = evt.data;
document.getElementById("showMes").value+=received_msg+"\n";
};
ws.onclose = function() {
alert("断开了连接");
};
} else {
alert("浏览器不支持WebSocket");
}
function sendMeg(){
var message=document.getElementById("name").value+":"+document.getElementById("mes").value;
document.getElementById("showMes").value+=message+"\n\n";
socket.send(message);
}
