nodejs+express+socketio實現即時聊天系統初體驗

jopen 11年前發布 | 49K 次閱讀 Node.js 開發 NodeJS

1.先把必要的npm包給裝好

  要在socket中完成對session的認證先加上

  parseCookie = require('connect').utils.parseCookie
  MemoryStore = require('connect/middleware/session/memory');

把上面的所有npm包給裝好,還要裝socket.io 這是基本的

 

2.建立一個memory store的實例
var storeMemory = new express.session.MemoryStore({
    reapInterval: 60000 * 10
});

 

3.為了在express中使用session我們要加上

  app.use(express.cookieParser());
  app.use(express.session({secret:'wyq',store:storeMemory}));

 

4.設置session(session的認證)

    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'){   //這里一定要先判斷session.username,否則socket中的session一直為空  
                            handshakeData.session = session;  
                            callback(null,true);  
                        }else{  
                            callback('access die',false);  
                        }  
                    }catch(e){  
                        callback(e.message,false);  
                    }  
                }  
            });  
        }  
        else {  
            callback('nosession');  
        }  
    });



5.然后就是服務器端發送消息給客戶端

    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.客戶端需要處理的事情

<!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) == '@'){  
                                //處理私人消息  
                                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>
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