大家都知道股票交易所和聊天类软件都是实时消息传递的 建一个 tornado_websocket.py
# coding:utf-8 #正式 import tornado.web import tornado.ioloop import tornado.httpserver import tornado.options import os import datetime from tornado.web import RequestHandler from tornado.options import define, options from tornado.websocket import WebSocketHandler define("port", default=3333, type=int) class IndexHandler(RequestHandler): def get(self): self.render("chat-clients.html") class ChatHandler(WebSocketHandler): users = set() # 用来存放在线用户的容器 def open(self): self.users.add(self) # 建立连接后添加用户到容器中 for u in self.users: # 向已在线用户发送消息 u.write_message(u"[%s]-[%s]-进入聊天室" % (self.request.remote_ip, datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S"))) def on_message(self, message): for u in self.users: # 向在线用户广播消息 u.write_message(u"[%s]-[%s]-说：%s" % (self.request.remote_ip, datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S"), message)) def on_close(self): self.users.remove(self) # 用户关闭连接后从容器中移除用户 for u in self.users: u.write_message(u"[%s]-[%s]-离开聊天室" % (self.request.remote_ip, datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S"))) def check_origin(self, origin): return True # 允许WebSocket的跨域请求 if __name__ == '__main__': tornado.options.parse_command_line() app = tornado.web.Application([ (r"/", IndexHandler), (r"/chat", ChatHandler), ], static_path = os.path.join(os.path.dirname(__file__), "static"), template_path = os.path.join(os.path.dirname(__file__), "template"), debug = True ) http_server = tornado.httpserver.HTTPServer(app) http_server.listen(options.port) tornado.ioloop.IOLoop.current().start()然后我们在建一个html template/chat_client.html
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>聊天室</title> </head> <body> <div id="contents" style="height:500px;overflow:auto;"></div> <div> <textarea id="msg"></textarea> <a href="javascript:;" onclick="sendMsg()">发送</a> </div> <!-- jQuery --> <script src="https://cdn.staticfile.org/jquery/3.3.1/jquery.min.js"></script> <script type="text/javascript"> var ws = new WebSocket("ws://127.0.0.1:3333/chat"); ws.onmessage = function(e) { $("#contents").append("<p>" + e.data + "</p>"); } function sendMsg() { var msg = $("#msg").val(); ws.send(msg); $("#msg").val(""); } </script> </body> </html>然后我们打开http://127.0.0.1:3333就可以看到了
