文章目錄
1、嘮嘮叨叨
最近又回顧了下Websocket，發現已經忘的七七八八了。於是用js寫了客戶端，用python寫了服務端，來複習一下這方面的知識。
2、先看一下效果吧
2.1、效果1（一個客戶端連上服務的併發送消息）
2.2、效果2（另一個客戶端連上服務的併發送消息）
2.3、效果3（服務的收到客戶端的全部消息並返回消息）
2.4、效果4（一個客戶端掉線並不影響其它socket連接）
2.5、效果5（列取全部連接客戶端對象和當前發消息的客戶端對象）
3、核心代碼
3.1、Python
#! -*- coding: utf-8 -*-
"""
Author: ZhenYuSha
Create Time: 2019-1-14
Info: Websocket 的使用示例
"""
import asyncio
import websockets
websocket_users = set()
# 檢測客戶端權限，用戶名密碼通過才能退出循環
async def 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(":")
if cred_dict[0] == "admin" and cred_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)
# 接收客戶端消息並處理，這裏只是簡單把客戶端發來的返回回去
async def 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)
# 服務器端主邏輯
async def run(websocket, path):
while True:
try:
await check_user_permit(websocket)
await recv_user_msg(websocket)
except websockets.ConnectionClosed:
print("ConnectionClosed...", path) # 鏈接斷開
print("websocket_users old:", websocket_users)
websocket_users.remove(websocket)
print("websocket_users new:", websocket_users)
break
except websockets.InvalidState:
print("InvalidState...") # 無效狀態
break
except 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）
<script>
var socket;
if ("WebSocket" in window) {
var ws = new WebSocket("ws://127.0.0.1:8181/test");
socket = ws;
ws.onopen = function() {
console.log('連接成功');
alert("連接成功, 請輸入賬號和密碼");
};
ws.onmessage = function(evt) {
var received_msg = evt.data;
document.getElementById("showMes").value+=received_msg+"\n";
};
ws.onclose = function() {
alert("斷開了連接");
};
} else {
alert("瀏覽器不支持WebSocket");
}
function sendMeg(){
var message=document.getElementById("name").value+":"+document.getElementById("mes").value;
document.getElementById("showMes").value+=message+"\n\n";
socket.send(message);
}
</script>
4、Github源碼分享
