socket.io+express多房间聊天应用

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socket.io简介

Socket.IO是一个开源的WebSocket库,它通过Node.js实现WebSocket服务端,同时也提供客户端JS库。Socket.IO支持以事件为基础的实时双向通讯,它可以工作在任何平台、浏览器或移动设备。
Socket.IO支持4种协议:WebSocket、htmlfile、xhr-polling、jsonp-polling,它会自动根据浏览器选择适合的通讯方式,从而让开发者可以聚焦到功能的实现而不是平台的兼容性,同时Socket.IO具有不错的稳定性和性能。

多房间聊天

socket.io提供rooms和namespace的API
用rooms的API就可以实现多房间聊天了,总结出来无外乎就是:join/leave room 和 say to room

// join和leave
io.on('connection', function(socket){
  socket.join('some room');
  // socket.leave('some room');
});

// say to room
io.to('some room').emit('some event'):
io.in('some room').emit('some event'):

代码 github

新建文件夹chatapp-demo
chatapp-demo/package.json

{
  "name": "chatapp-demo",
  "version": "1.0.0",
  "description": "multi room chat app demo, powered by socket.io",
  "main": "app.js",
  "dependencies": {
    "express": "^4.13.3",
    "hbs": "^3.1.0",
    "path": "^0.11.14",
    "socket.io": "^1.3.6"
  },
  "devDependencies": {},
  "author": "wuyanxin",
  "license": "ISC"
}

执行 npm install

服务端代码

增加文件 chatapp-demo/app.js

var express = require('express');
var path = require('path');
var IO = require('socket.io');
var router = express.Router();

var app = express();
var server = require('http').Server(app);
app.use(express.static(path.join(__dirname, 'public')));
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'hbs');

// 创建socket服务
var socketIO = IO(server);
// 房间用户名单
var roomInfo = {};

socketIO.on('connection', function (socket) {
  // 获取请求建立socket连接的url
  // 如: http://localhost:3000/room/room_1, roomID为room_1
  var url = socket.request.headers.referer;
  var splited = url.split('/');
  var roomID = splited[splited.length - 1];   // 获取房间ID
  var user = '';

  socket.on('join', function (userName) {
    user = userName;

    // 将用户昵称加入房间名单中
    if (!roomInfo[roomID]) {
      roomInfo[roomID] = [];
    }
    roomInfo[roomID].push(user);

    socket.join(roomID);    // 加入房间
    // 通知房间内人员
    socketIO.to(roomID).emit('sys', user + '加入了房间', roomInfo[roomID]);  
    console.log(user + '加入了' + roomID);
  });

  socket.on('leave', function () {
    socket.emit('disconnect');
  });

  socket.on('disconnect', function () {
    // 从房间名单中移除
    var index = roomInfo[roomID].indexOf(user);
    if (index !== -1) {
      roomInfo[roomID].splice(index, 1);
    }

    socket.leave(roomID);    // 退出房间
    socketIO.to(roomID).emit('sys', user + '退出了房间', roomInfo[roomID]);
    console.log(user + '退出了' + roomID);
  });

  // 接收用户消息,发送相应的房间
  socket.on('message', function (msg) {
    // 验证如果用户不在房间内则不给发送
    if (roomInfo[roomID].indexOf(user) === -1) {  
      return false;
    }
    socketIO.to(roomID).emit('msg', user, msg);
  });

});

// room page
router.get('/room/:roomID', function (req, res) {
  var roomID = req.params.roomID;

  // 渲染页面数据(见views/room.hbs)
  res.render('room', {
    roomID: roomID,
    users: roomInfo[roomID]
  });
});

app.use('/', router);

server.listen(3000, function () {
  console.log('server listening on port 3000');
});
客户端代码

新增chatapp/views/room.hbs

<!DOCTYPE html>
<html>
<head lang="en">
  <meta charset="UTF-8">
  <title>{{roomID}}</title>
  <style>
    #msglog, #messageInput {
      border: 1px solid #ccc;
      width: 500px;
      height: 350px;
      overflow-y: auto;
      font-size: 14px;
    }
    #messageInput {
      height: 80px;
    }
    .message {
      line-height: 22px;
    }
    .message .user {
      padding-right: 5px;
      padding-left: 5px;
      color: brown;
    }
    .sysMsg {
      color: #c1bfbf;
      padding-right: 5px;
      padding-left: 5px;
      font-size: 12px;
    }
    #users {
      width: 490px;
      padding: 0 5px 5px;
    }
  </style>
</head>
<body>
  昵称: <span id="userName"></span> <br/>
  房间: {{roomID}} <br/>
  当前在线人数: <span id="count">{{users.length}}</span> <br/>
  在线用户:  <div id="users">{{users}}</div>

  <div id="msglog">

  </div>
  <textarea name="message" id="messageInput"></textarea>
  <br/>
  按Enter键发送
  <button id="joinOrLeave">退出房间</button>

  <script src="/socket.io/socket.io.js"></script>
  <script src="/js/jquery.js"></script>
  <script>
    $(function () {
      // ----------设置昵称-------------
      var userName = '';
      while ($('#userName').text().trim() === '') {
        userName = prompt("请设置你的昵称","");
        $('#userName').text(userName);
      }


      // ---------创建连接-----------
      var socket = io();

      // 加入房间
      socket.on('connect', function () {
        socket.emit('join', userName);
      });

      // 监听消息
      socket.on('msg', function (userName, msg) {
        var message = '' +
            '<div class="message">' +
            '  <span class="user">' + userName + ': </span>' +
            '  <span class="msg">' + msg + '</span>' +
            '</div>';
        $('#msglog').append(message);
        // 滚动条保持最下方
        $('#msglog').scrollTop($('#msglog')[0].scrollHeight);  
      });

      // 监听系统消息
      socket.on('sys', function (sysMsg, users) {
        var message = '<div class="sysMsg">' + sysMsg + '</div>';
        $('#msglog').append(message);

        $('#count').text(users.length);
        $('#users').text(users);
      });

      // 发送消息
      $('#messageInput').keydown(function (e) {
        if (e.which === 13) {
          e.preventDefault();
          var msg = $(this).val();
          $(this).val('');

          socket.send(msg);
        }
      });

      // 退出房间
      $('#joinOrLeave').click(function () {
        if ($(this).text() === '退出房间') {
          $(this).text('进入房间');
          socket.emit('leave');
          var msg = '你已经退出了房间,重新发言请点击"进入房间"';
          $('#msglog').append('<div class="sysMsg">'+msg+'</div>');
        } else {
          $(this).text('退出房间');
          socket.emit('join', userName);
        }

      });
    });
  </script>
</body>
</html>

新增 chatapp/public/index.html

<!DOCTYPE html>
<html>
<head lang="en">
  <meta charset="UTF-8">
  <title>demo</title>
</head>
<body>
  欢迎您,骚年

  <div>
    <p>房间列表</p>
    <ul>
      <li id="room_1"><a href="/room/room_1" target="_blank">1号房间</a></li>
      <li id="room_2"><a href="/room/room_2" target="_blank">2号房间</a></li>
      <li id="room_3"><a href="/room/room_3" target="_blank">3号房间</a></li>
      <li id="room_4"><a href="/room/room_4" target="_blank">4号房间</a></li>
      <li id="room_5"><a href="/room/room_5" target="_blank">5号房间</a></li>
      <li id="room_6"><a href="/room/room_6" target="_blank">6号房间</a></li>
      <li id="room_7"><a href="/room/room_7" target="_blank">7号房间</a></li>
      <li id="room_8"><a href="/room/room_8" target="_blank">8号房间</a></li>
      <li id="room_9"><a href="/room/room_9" target="_blank">9号房间</a></li>
      <li id="room_10"><a href="/room/room_10" target="_blank">10号房间</a></li>
    </ul>
  </div>

</body>
</html>
运行效果
运行效果

代码已放在github https://github.com/wuyanxin/chatapp-demo.git

参考:

http://socket.io/docs/rooms-and-namespaces/
http://blog.fens.me/nodejs-socketio-chat/
http://www.jianshu.com/p/d9b1273a93fd

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