socket.io 聊天室例子

[{"_1":2,"_3":-5,"_4":-5},"loaderData",{"_5":6,"_7":8},"actionData","errors","root",{"_11":-5},"routes/user.$name.collections",{"_9":10,"_11":12,"_13":14,"_15":16,"_17":18,"_19":16},"topics",[35],"user",{"_20":21,"_13":14,"_22":23,"_24":14,"_25":26,"_27":28,"_29":30,"_31":32,"_33":34},"loginname","CoinLEE","page",1,"limit",20,"total","id","12608","avatar_url","https://avatars.githubusercontent.com/u/7554375?v=3","githubUsername","create_at","2014-05-12 06:34:45.886","score",15,"topic_count",0,"reply_count",3,"is_star",false,{"_20":36,"_37":38,"_39":-5,"_40":41,"_42":43,"_44":45,"_46":34,"_47":34,"_31":48,"_49":50,"_25":51,"_52":53},"7228","author_id","7810","tab","content","今天我来实现一个简单的聊天室，后台用`nodejs`, 客户端与服务端通信用`socket.io`,这是一个比较成熟的`websocket`框架.\r\n\r\n### 初始工作\r\n\r\n* 安装`express`, 用这个来托管`socket.io`,以及静态页面,命令`npm install express --save`,`--save`可以使包添加到`package.json`文件里.\r\n\r\n* 安装`socket.io`,命令`npm install socket.io --save`.\r\n\r\n### 编写服务端代码\r\n\r\n首先我们通过express来托管网站，并附加到`socket.io`实例里，因为`socket.io`初次连接需要`http`协议\r\n\r\n```js\r\nvar express = require('express'),\r\n io = require('socket.io');\r\n\r\nvar app = express();\r\n\r\napp.use(express.static(__dirname));\r\n\r\nvar server = app.listen(8888);\r\n\r\n\r\nvar ws = io.listen(server);\r\n\r\n```\r\n添加服务器连接事件，当客户端连接成功之后，发公告告诉所有在线用户，并且，当用户发送消息时，发广播通知其它用户.\r\n\r\n```js\r\nws.on('connection', function(client){\r\n console.log('\\033[96msomeone is connect\\033[39m \\n');\r\n client.on('join', function(msg){\r\n // 检查是否有重复\r\n if(checkNickname(msg)){\r\n client.emit('nickname', '昵称有重复!');\r\n }else{\r\n client.nickname = msg;\r\n ws.sockets.emit('announcement', '系统', msg + ' 加入了聊天室!');\r\n }\r\n });\r\n // 监听发送消息\r\n client.on('send.message', function(msg){\r\n client.broadcast.emit('send.message',client.nickname, msg);\r\n });\r\n // 断开连接时，通知其它用户\r\n client.on('disconnect', function(){\r\n if(client.nickname){\r\n client.broadcast.emit('send.message','系统', client.nickname + '离开聊天室!');\r\n }\r\n })\r\n\r\n})\r\n```\r\n\r\n由于客户端是通过昵称来标识的，所以服务端需要一个检测昵称重复的函数\r\n\r\n```js\r\n// 检查昵称是否重复\r\nvar checkNickname = function(name){\r\n for(var k in ws.sockets.sockets){\r\n if(ws.sockets.sockets.hasOwnProperty(k)){\r\n if(ws.sockets.sockets[k] && ws.sockets.sockets[k].nickname == name){\r\n return true;\r\n }\r\n }\r\n }\r\n return false;\r\n}\r\n```\r\n\r\n### 编写客服端代码\r\n\r\n由于服务端采用第三方`websokcet`框架，所以前端页面需要单独引用`socket.io`客户端代码，源文件可以从`socket.io`模块里找，windows下路径为`node_modules\\socket.io\\node_modules\\socket.io-client\\dist`,这里有开发版和压缩版的，默认引用开发版就行.\r\n\r\n前端主要处理输入昵称检查，消息处理，完整代码如下\r\n\r\n```html\r\n\r\n\r\n\r\n socket.io 聊天室例子\r\n \r\n \r\n \r\n \r\n\r\n\r\n

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\r\n \r\n \r\n\r\n\r\n```\r\n\r\n这里提供[完整的代码压缩文件](http://pan.baidu.com/s/1eQkTbqy)\r\n\r\n\r\n### 总结\r\n\r\nnodejs是一个好东西，尤其是在处理消息通讯，网络编程方面，天生的异步IO.\r\n\r\n","title","用NodeJS实现一个简单的聊天室","last_reply_at","2016-04-01 08:15:48.188","good","top",6,"visit_count",47789,"2014-05-18 08:41:43.005","author",{"_13":54,"_22":55},"xuwenmin","http://www.gravatar.com/avatar/928f5af23596066b77f9db50b4b8c923?size=48"]