nodejs实现在线群聊

时间:2023-01-01 18:37:43


这不是一个项目而是一个适合初学者学习的例子,主要实现了以下基本功能:

1:群聊,每一个人都可以收到其他人的消息,以及可以发消息给其他人,每一个人用ip地址标识。

2:显示当前在线用户。

3:每一个用户登入登出,其他人都可以看到。

4:每一个用户可以看到其他人是否正在输入消息。


实现方式没有选择低效的轮询方式,而是采用基于websocket协议的socket.io模块,websocket协议允许在客户端与服务端之间建立一个全双工的通信通道,因此服务端可以主动推消息给客户端。相比传统的轮询,实时性更好。

前端代码如下:

<!doctype html>
<html>
<head>
    <title>Socket.IO chat</title>
    <style>
        * { margin: 0; padding: 0; box-sizing: border-box; }
        body { font: 13px Helvetica, Arial; }
        form { background: #fc5bff; padding: 2px; position: fixed; bottom: 0; width: 100%; }
        form input { border: 0; padding: 10px; width: 90%; margin-right: .5%; }
        form button { width: 9%; background: rgb(217, 222, 221); border: none; padding: 10px; }
        #messages { list-style-type: none; margin: 0; padding: 0; }
        #messages li { padding: 5px 10px; }
        #messages li:nth-child(odd) { background: #eee; }
    </style>
</head>
<body>
<ul id="messages"></ul>
<ul><li id='typingshow'></li></ul>
<div id='joinshow'></div>
<div id='leftshow'></div>
<div id='onlineshow'></div>
<form action="">

    <input id="m" autocomplete="off" /><button id='btn'>Send</button>
</form>
<script src="jquery-1.10.2.min.js"></script>
<script src="/socket.io/socket.io.js"></script>
<script>
    var socket = io();
    var typingIps={};
    var typing=false;
    var lastTypingTime;
    function updateTyping() {
        if (!typing) {
            typing = true;
            socket.emit('typing');
        }
        lastTypingTime = (new Date()).getTime();

        setTimeout(function () {
            var typingTimer = (new Date()).getTime();
            var timeDiff = typingTimer - lastTypingTime;
            if (timeDiff >= 400 && typing) {
                socket.emit('stop typing');
                typing = false;
            }
        }, 400);
    }
    $('form').submit(function(){
        socket.emit('chat message',$('#m').val());
        socket.emit('stop typing');
        typing = false;
        $('#m').val('');
        return false;
    });
    $('#m').keyup(function(){
        updateTyping();
    });
    socket.on('online num',function(msg){
        $('#onlineshow').text('当前在线'+msg+'人');
    });

    socket.on('join', function (msg) {
        $('#joinshow').text(msg.ip+'加入');
    });
    socket.on('typing',function(msg){
        typingIps[msg.ip]=msg.ip;
        var typingArr=[];
        for(var ip in typingIps){
            typingArr.push(typingIps[ip]);
        }
        $('#typingshow').text(typingArr.join(',') + '正在输入...');
    });
    socket.on('stop typing',function(msg){
        delete typingIps[msg.ip];
        var typingArr=[];
        for(var ip in typingIps){
            typingArr.push(typingIps[ip]);
        }
        if(typingArr.length===0){
            $('#typingshow').text('');
        }else{
            $('#typingshow').text(typingArr.join(',') + '正在输入...');
        }
    });
    socket.on('chat message', function(msg){
        $('#messages').append($('<li>').text(msg.ip+'说:'+msg.content));
    });
    socket.on('user left', function(msg){
        $('#leftshow').text(msg.ip+'离开了');
        $('#onlineshow').text('当前在线'+msg.onlineNum+'人');
    });
</script>
</body>
</html>

服务端代码:

/**
 * Created by luzhen on 14-11-10.
 */
var express = require('express');
var app=express();
var http = require('http').Server(app);
var io = require('socket.io')(http);
var ips={};
app.use(express.static(__dirname + '/public'));
app.get('/', function (req, res) {
    res.sendFile(__dirname + '/index.html');
});
var onlineNum=0;
io.on('connection', function (socket) {
    console.log(socket.request.connection.remoteAddress);
    ips[socket.request.connection.remoteAddress]=socket.request.connection.remoteAddress;//客户端ip
    //socket.handshake.address 服务端ip
    onlineNum++;
    socket.broadcast.emit('join', {'ip':socket.request.connection.remoteAddress});//广播新用户加入

    io.emit('online num',onlineNum);//广播当前在线人数

    socket.on('chat message', function (msg) {
        io.emit('chat message', {ip:socket.request.connection.remoteAddress,'content':msg});
        console.log('message: ' + msg);
    });

    socket.on('typing', function (msg) {
        socket.broadcast.emit('typing', {'ip':socket.request.connection.remoteAddress});
    });
    socket.on('stop typing', function (msg) {
        socket.broadcast.emit('stop typing', {'ip':socket.request.connection.remoteAddress});
    });

    socket.on('disconnect',function(){
        delete ips[socket.request.connection.remoteAddress];
        onlineNum--;
        socket.broadcast.emit('user left', {'ip':socket.request.connection.remoteAddress,'onlineNum':onlineNum});
    });
});

http.listen(3000, function () {
    console.log('listening on *:3000');
});

新增了防止刷屏功能,完整代码开源在GitHub上。

Demo演示 查看效果