Flask SocketIO 服务端向客户端实时推送

最新推荐文章于 2025-03-31 18:15:00 发布

JOSON.

最新推荐文章于 2025-03-31 18:15:00 发布

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分类专栏： Flask 文章标签： flask websocket socketio 实时推送实时更新

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本文介绍使用Flask和SocketIO实现的实时通讯系统，通过维护一个永久的TCP连接，后端能每2秒生成随机数并即时推送给前端，相较于Ajax轮询，此方式数据更实时且减轻服务器负载。

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App.py Code：

#!/usr/bin/env python
# -*- coding: utf-8 -*-

from flask import Flask, render_template
from flask_socketio import SocketIO
from threading import Lock
import random

async_mode = None
app = Flask(__name__)
app.config['SECRET_KEY'] = 'secret!'
socketio = SocketIO(app, async_mode=async_mode)
thread = None
thread_lock = Lock()

@app.route('/')
def index():
    return render_template('index.html', async_mode=socketio.async_mode)

@socketio.on('connect', namespace='/test_conn')
def test_connect():
    global thread
    with thread_lock:
        if thread is None:
            thread = socketio.start_background_task(target=background_thread)

def background_thread():
    while True:
        socketio.sleep(2)
        t = random.randint(1, 100)
        socketio.emit('server_response', {'data': t}, namespace='/test_conn')

@socketio.on('disconnect', namespace='/chat')
def test_disconnect():
    print('Client disconnected')

if __name__ == '__main__':
    socketio.run(app, debug=True)

Index.html Code：

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title></title>
    <script type="text/javascript" src="//cdn.bootcdn.net/ajax/libs/jquery/3.5.1/jquery.js"></script>
    <script type="text/javascript" src="//cdn.bootcdn.net/ajax/libs/socket.io/2.3.0/socket.io.js"></script>
</head>
<body>
<h1 id="tag"></h1>
<script type="text/javascript">
    $(document).ready(function() {
        namespace = '/test_conn';
        var socket = io.connect(location.protocol + '//' + document.domain + ':' + location.port + namespace);
        socket.on('server_response', function(res) {
            console.log(res.data);
            $('#tag').text(res.data);
        });
    });
</script>
</body>
</html>