首先是安装flask-socketio库
pip install flask-socketio
注意：flask-socketio存在兼容问题，使用的时候可能会出现下面这种错误
The client is using an unsupported version of the Socket.IO or Engine.IO protocols (further occurrences of this error will be logged with level INFO)
解决方法：安装低版本和对应的依赖
我安装的以下版本
Flask-SocketIO==4.3.1
python-engineio==3.13.2
python-socketio==4.6.0
如果已经安装了最新版本可以用以下的方式解决
pip install --upgrade python-socketio==4.6.0
pip install --upgrade python-engineio==3.13.2
pip install --upgrade Flask-SocketIO==4.3.1
测试代码：
from flask import Flask, render_template
from flask_socketio import SocketIO, emit
app = Flask(__name__)
app.config['SECRET_KEY'] = 'secret!'
socketio = SocketIO(app)
html = '''
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script src="https://cdn.bootcss.com/jquery/3.2.0/jquery.js"></script>
<script src="https://cdn.bootcss.com/socket.io/2.1.1/socket.io.js"></script>
</head>
<body>
<form id="emit">
<label>my response:</label><input type="text" id="emit_data" value="test_submit"/>
<input type="submit" value="发送"/>
</form>
<div id="log" style="width: 300px;height: 500px;background-color: #0C0C0C;
color: white;text-align: center;line-height: 50px;margin-left: 40%;font-size: 20px"></div>
<form id="emit2">
<label>my broadcast event:</label><input type="text" id="emit_data2" value="test_submit"/>
<input type="submit" value="发送"/>
</form>
<div id="log2" style="width: 300px;height: 500px;background-color: #0C0C0C;
color: white;text-align: center;line-height: 50px;margin-left: 40%;font-size: 20px"></div>
<script type="text/javascript" charset="utf-8">
$(document).ready(function(){
var socket = io.connect('http://' + document.domain + ':' + location.port + '/test');
socket.on('my response', function(msg) {
$('#log').append('<p>my response: ' + msg.data + '</p>');
});
$('#emit').submit(function(event) {
socket.emit('my event', {data: $('#emit_data').val()});
return false;
});
socket.on('my broadcast event', function(msg) {
$('#log2').append('<p>my broadcast event: ' + msg.data + '</p>');
});
$('#emit2').submit(function(event) {
socket.emit('my broadcast event', {data: $('#emit_data2').val()});
return false;
});
});
</script>
</body>
</html>
'''
@app.route('/')
def index():
return html
@socketio.on('my event', namespace='/test')
def test_message(message):
print('接收到客户端数据：',message)
emit('my response', {'data': message['data']})
@socketio.on('my broadcast event', namespace='/test')
def test_message(message):
print('my broadcast event',message)
emit('my broadcast event', {'data': message['data']}, broadcast=True) # broadcast参数为true可以广播到所有连接到my broadcast event的用户
@socketio.on('connect', namespace='/test')
def test_connect():
print('websocket已连接')
emit('my response', {'data': 'hello boy'})
@socketio.on('disconnect', namespace='/test')
def test_disconnect():
print('对方已断开连接')
if __name__ == '__main__':
socketio.run(app)
直接运行这段代码，测试连接和通讯是否正常
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