nodejs+express+socketio实现即时聊天系统初体验
1.先把必要的npm包给装好
要在socket中完成对session的认证先加上
parseCookie = require('connect').utils.parseCookie
MemoryStore = require('connect/middleware/session/memory');
把上面的所有npm包给装好,还要装socket.io 这是基本的
2.建立一个memory store的实例
var storeMemory = new express.session.MemoryStore({
reapInterval: 60000 * 10
});
3.为了在express中使用session我们要加上
app.use(express.cookieParser());
app.use(express.session({secret:'wyq',store:storeMemory}));
4.设置session(session的认证)
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io.set('authorization', function(handshakeData, callback){ if(handshakeData.headers.cookie){ handshakeData.cookie = parseCookie(handshakeData.headers.cookie); var connect_sid = handshakeData.cookie['connect.sid'].split('.')[0].split(':')[1]; }else{ callback('cookie is not defined',false); } if (connect_sid) { storeMemory.get(connect_sid, function(error, session){ if (error) { callback(error.message, false); }else{ try{ if(typeof session.username != 'undefined'){ //这里一定要先判断session.username,否则socket中的session一直为空 handshakeData.session = session; callback(null,true); }else{ callback('access die',false); } }catch(e){ callback(e.message,false); } } }); } else { callback('nosession'); } });
5.然后就是服务器端发送消息给客户端
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io.sockets.on('connection', function (socket){ var session = socket.handshake.session;//session var username = session.username; usersWS[username] = socket; var refresh_online = function(){ var n = []; for (var i in usersWS){ if(usersWS[i] != usersWS[username]){ n.push(i); } } io.sockets.emit('online list', n); } refresh_online(); socket.on('message',function(message){ socket.broadcast.emit('message',message); }) socket.broadcast.emit('system message', '【'+username + '】come back!!!'); socket.on('private message',function(to, msg, fn){ var target = usersWS[to]; if (target) { fn(true); target.emit('private message', username+'[sixin]', msg); } else { fn(false) socket.emit('message error', to, msg); } }); });
6.客户端需要处理的事情
<!doctype html> <html> <head> <meta charset="gb2312" /> <title>123123</title> <style> .red{color:red} .blue{color:blue} .green{color:green} </style> <script src="/socket.io/socket.io.js"></script> <script> window.onload = function(){ var ul = document.getElementById('ul'); var text = document.getElementById('text'); var iosocket = io.connect(); iosocket.on('connect',function(){ var li = document.createElement('li'); li.innerHTML = 'conencted'; ul.appendChild(li); iosocket.on('message',function(message){ var li = document.createElement('li'); li.innerHTML = 'you get a message:' + message + ' ' + new Date().toLocaleString(); li.className = 'blue'; ul.appendChild(li); }) iosocket.on('system message',function(message){ var li = document.createElement('li'); li.innerHTML = message li.className = 'green'; ul.appendChild(li); }) iosocket.on('online list',function(message){ var total = document.getElementById('total'); var peopleList = document.getElementById('peopleList'); total.innerHTML = message.length; for(var i=0;i<message.length;i++){ var li = document.createElement('li'); li.innerHTML = message[i]; peopleList.appendChild(li); } }) text.onkeypress = function(ev){ var oEvent = ev || window.event; if(oEvent.keyCode == 13){ if(text.value.substr(0,1) == '@'){ //处理私人消息 var to = text.value.substr(2); iosocket.emit('private message',to,'message',function(ok){ if(ok){ var li = document.createElement('li'); li.innerHTML = 'message'; ul.appendChild(li); } }) } } } iosocket.on('private message',function(from,message){ var ceshi = document.getElementById('ceshi'); var li = document.createElement('li'); li.innerHTML = from+ ' : ' + message; ul.appendChild(li); }) iosocket.on('disconnect', function() { var li = document.createElement('li'); li.innerHTML = 'disconnected'; ul.appendChild(li); }); }) } </script> </head> <body> <%if(username){%> <input type="text" id="ceshi" /> welcome to liaotianshi <span style="font-size:14px ;font-weight:bolder"><%=username%><span><br /> liaotian has <span id="total"></span> total people <br /> liaotiaoshi people: <ul id="peopleList"> </ul> <br /> all messages: <br /> <div style="width:600px;overflow:auto;border:1px solid #ccc;background:#ccc"> <ul id="ul"></ul> </div> <br /> send message:<input type="text" id="text" /> <%}else{%> <form action="/login" method="post"> input your name:<input type="text" name="username" /><br /> <input type="submit" name="sub" value="join message" /> </form> <%}%> </body> </html> 本文由用户 jopen 自行上传分享，仅供网友学习交流。所有权归原作者，若您的权利被侵害，请联系管理员。
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