Flask基于websocket的简单聊天室
1、安装gevent-websocket
pip install -i https://pypi.tuna.tsinghua.edu.cn/simple/ gevent-websocket
2、chat.py文件内容如下:
from flask import Flask,request,render_template import json from geventwebsocket.handler import WebSocketHandler from gevent.pywsgi import WSGIServer from geventwebsocket.websocket import WebSocket user_dict = {} chat_app = Flask(__name__) @chat_app.route('/ws/<username>') def ws_chat(username): user_socket = request.environ.get('wsgi.websocket') # type:WebSocket user_dict[username]=user_socket while 1: msg = user_socket.receive() # 等待接收客户端发来的数据 msg_dict = json.loads(msg) msg_dict['from_user'] = username to_user = msg_dict.get('to_user') if to_user == "": # 如果用户名是空表示群发 for uname, uwebsocket in user_dict.items(): if uname == username: # 群发时不用给自己发 continue uwebsocket.send(json.dumps(msg_dict)) continue to_user_socket = user_dict.get(to_user) if not to_user_socket: # 判断用户字典中是否存在用户的websocket连接 continue try: msg_dict['from_user'] = msg_dict['from_user'] + '@私聊我' to_user_socket.send(json.dumps(msg_dict)) except: user_dict.pop(to_user) @chat_app.route('/webchat') def webchat(): return render_template('public_chat.html') if __name__ == '__main__': server = WSGIServer(('0.0.0.0',9527),chat_app,handler_class=WebSocketHandler) server.serve_forever()
3、web_chat.html文件部分内容如下:
<p>你的名字:<input type="text" id="username"> <button onclick="open_ws()">登陆聊天室</button> </p> <form onsubmit="return false;"> <h3>WebSocket 聊天室:</h3> <textarea id="responseText" style="width: 500px; height: 300px;"></textarea> <br> 给:<input type="text" id="to_user">消息内容:<input type="text" id="message"> <input type="button" value="发送消息" onclick="send_msg()"> <input type="button" onclick="javascript:document.getElementById('responseText').value=''" value="清空聊天记录"> </form>
4、js代码如下:
<script type="application/javascript"> var ws = null; function open_ws() { var username = document.getElementById('username').value; ws = new WebSocket("ws://192.168.16.239:9527/ws/" + username); ws.onopen = function () { alert("登陆成功"); }; ws.onmessage = function (eventMessage) { // 显示消息记录 var chat = JSON.parse(eventMessage.data); console.log(chat); var chat_content = document.getElementById('responseText'); chat_content.value = chat_content.value + "\n" + chat.from_user + " : " + chat.chat; }; } function send_msg() { // 发送消息 var to_user = document.getElementById("to_user").value; var msg = document.getElementById("message").value; var send_str = { to_user: to_user, chat: msg }; ws.send(JSON.stringify(send_str)); var chat_content = document.getElementById("responseText"); chat_content.value = chat_content.value + "\n" + "我: " + msg; } </script>
最终的效果图如下:
程序异常说明:这个代码是好早之前的了,当时运行时没有问题的,后来看到博客下有好多说运行不了,我就把代码复制到我的新环境下测试,发现确实运行不了,后来百度了半天没找到解决方案,无奈我自己就进行单步调试,发现是flask下的request模块无法获取到数据,导致程序异常,我就查找request模块所在的文件位置,发现在Werkzeug中。我翻出以前那台电脑,还好数据都在,运行代码没问题,我就查看了老电脑的运行环境python3.6 flask1.0.3,查看里面的Werkzeug的版本是0.15.4,我新装的环境python3.6 flask1.0.3 Werkzeug2.0.3,所以解决方案就是卸载Werkzeug2.0.3,安装Werkzeug0.15.4程序即可正常运行。