Tornado实现聊天室功能（websocket）
小试了一把Tornado的websocket来实现聊天室的功能，非常简单，上代码：
服务器端：
import logging import tornado.escape import tornado.ioloop import tornado.options import tornado.web import tornado.websocket import os.path import uuid from tornado.options import define, options define("port", default=8888, help="run on the given port", type=int) class Application(tornado.web.Application): def __init__(self): handlers = [ (r"/", MainHandler), (r"/websocket", ChatSocketHandler), ] settings = dict( cookie_secret="__TODO:_GENERATE_YOUR_OWN_RANDOM_VALUE_HERE__", template_path=os.path.join(os.path.dirname(__file__), "templates"), static_path=os.path.join(os.path.dirname(__file__), "static"), xsrf_cookies=True, ) tornado.web.Application.__init__(self, handlers, **settings) class MainHandler(tornado.web.RequestHandler): def get(self): self.render("index.html", messages=ChatSocketHandler.cache) class ChatSocketHandler(tornado.websocket.WebSocketHandler): waiters = set() cache = [] cache_size = 200 def allow_draft76(self): # for iOS 5.0 Safari return True def open(self): print "new client opened" ChatSocketHandler.waiters.add(self) def on_close(self): ChatSocketHandler.waiters.remove(self) @classmethod def update_cache(cls, chat): cls.cache.append(chat) if len(cls.cache) > cls.cache_size: cls.cache = cls.cache[-cls.cache_size:] @classmethod def send_updates(cls, chat): logging.info("sending message to %d waiters", len(cls.waiters)) for waiter in cls.waiters: try: waiter.write_message(chat) except: logging.error("Error sending message", exc_info=True) def on_message(self, message): logging.info("got message %r", message) ChatSocketHandler.send_updates(message) def main(): tornado.options.parse_command_line() app = Application() app.listen(8080) tornado.ioloop.IOLoop.instance().start() if __name__ == "__main__": main()客户端：
<html><head><title>Web Socket Client</title></head> <body> <script type="text/javascript"> var socket; if (!window.WebSocket) { window.WebSocket = window.MozWebSocket; } // Javascript Websocket Client if (window.WebSocket) { socket = new WebSocket("ws://10.197.60.125:8080/websocket"); socket.onmessage = function(event) { var ta = document.getElementById('responseText'); ta.value = ta.value + '\n' + event.data }; socket.onopen = function(event) { var ta = document.getElementById('responseText'); ta.value = "Web Socket opened!"; }; socket.onclose = function(event) { var ta = document.getElementById('responseText'); ta.value = ta.value + "Web Socket closed"; }; } else { alert("Your browser does not support Web Socket."); } // Send Websocket data function send(message) { if (!window.WebSocket) { return; } if (socket.readyState == WebSocket.OPEN) { socket.send(message); } else { alert("The socket is not open."); } } </script> <h3>Send :</h3> <form onsubmit="return false;"> <input type="text" name="message" value="Hello World!"/><input type="button" value="Send Web Socket Data" onclick="send(this.form.message.value)" /> <h3>Receive :</h3> <textarea id="responseText" style="width:500px;height:300px;"></textarea> </form> </body> </html> 来自：http://blog.csdn.net/lrenjun/article/details/8906099
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