后端代码：
# web_socket 的收发机制 # web_socket --> web + socket --> http协议 + socket # web_socket协议就是ws协议 # 基于flask框架为web_socket提供服务 from flask import Flask,request,render_template from geventwebsocket.handler import WebSocketHandler from gevent.pywsgi import WSGIServer from geventwebsocket.websocket import WebSocket # 做语法提示用的 app = Flask(__name__) # type: Flask user_socket_list = [] @app.route("/ws") def web_sck(): # print(request.environ) # 打印的原始请求数据 # 这个东西其实就是WebSocket的长链接 user_socket = request.environ.get("wsgi.websocket") # type: WebSocket if user_socket: user_socket_list.append(user_socket) # print(len(user_socket_list),user_socket_list) while 1: msg = user_socket.receive() # 接收客户端传入数据 # 在浏览器中content的中输入ws ，readyState如果为1 表示连接成功，如果等于3表示，连接成功后又断开了连接，0 表示没有开启 print(msg) for usocket in user_socket_list: if user_socket == usocket: continue try: usocket.send(msg) except: continue @app.route("/") def index(): return render_template("web_sck1.html") if __name__ == "__main__": # app.run("0.0.0.0",8000,debug=True) http_serve = WSGIServer(("0.0.0.0",8000),app,handler_class=WebSocketHandler) http_serve.serve_forever() # 启动这个web-server请求
前端代码：
<!DOCTYPE html> <html lang="zh-CN"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <title>多人聊天</title> </head> <body> <p> 发送内容： <input type="text" id="message"> <button onclick="send_msg()">点击发送</button> </p> <div id="msg_list" style=" 500px"> </div> <script type="application/javascript"> var ws = new WebSocket("ws://192.168.12.38:8000/ws") ; // 指定发送的链接地址 ws.onopen = function(){ // {#ws.send("hello")#} }; // 前端接收消息 ws_info 接收数据的容器 ws.onmessage = function (ws_info) { console.log(ws_info.data); //后端返回的响应数据，存放在ws_info下的data中 var ptag = document.createElement("p"); //创建一个p标签 ptag.innerText = ws_info.data;//将data中的数据存放标签中 document.getElementById("msg_list").appendChild(ptag) }; function send_msg() { var msg = document.getElementById("message").value; var ptag = document.createElement("p"); //创建一个p标签 ptag.style.cssText = "text-align: right;"; ptag.innerText = msg;//将data中的数据存放标签中 document.getElementById("msg_list").appendChild(ptag) ws.send(msg); // 拿到前端输入的内容，向后端发送 } </script> </body> </html>