无法启动并运行socket.io

时间:2012-06-01 19:40:19

标签: html5 node.js websocket socket.io

我在Windows上运行并使用WAMP作为本地主机服务器。我已经搜索了很多教程,尝试了很多东西等但仍然无效......

当前设置

现在写一下,在我的www /目录中,我创建了一个名为socketiodemo的文件夹。

在其中,我做了npm install socket.io并安装了一些其他节点包:

  • socket.io
  • 表示
  • 笔尖
  • 触针

我安装了上述所有软件包,即使我实际上并不需要它们。我刚刚安装了它们,因为很多教程需要它们但是我宁愿不使用它们而只是使用javascript来获取纯socket.io。

所以,这是我的目录在www:

下的快照
  • app.js
  • 的index.html
  • node_modules
    • socket.io
    • 表示
    • 笔尖
    • 触针

我发现的一个最简单的教程给了我这个app.js代码,这是服务器端:

// Require HTTP module (to start server) and Socket.IO
var http = require('http'), io = require('socket.io');

// Start the server at port 8080
var server = http.createServer(function(req, res){ 

    // Send HTML headers and message
    res.writeHead(200,{ 'Content-Type': 'text/html' }); 
    res.end('<h1>Hello Socket Lover!</h1>');
});
server.listen(8080);

// Create a Socket.IO instance, passing it our server
var socket = io.listen(server);

// Add a connect listener
socket.sockets.on('connection', function(client){ 

    // Create periodical which ends a message to the client every 5 seconds
    var interval = setInterval(function() {
        client.send('This is a message from the server!  ' + new Date().getTime());
    },5000);

    // Success!  Now listen to messages to be received
    client.on('message',function(event){ 
        console.log('Received message from client!',event);
    });
    client.on('disconnect',function(){
        clearInterval(interval);
        console.log('Server has disconnected');
    });

});

以下是客户端代码的index.html:

<!DOCTYPE html>
<html>
<head>
    <style>
        * { margin:0; padding:0; font-size:11px; font-family:arial; color:#444; }
        body { padding:20px; }
        #message-list { list-style-type:none; width:300px; height:300px; overflow:auto; border:1px solid #999; padding:20px; }
        #message-list li { border-bottom:1px solid #ccc; padding-bottom:2px; margin-bottom:5px; }
        code { font-family:courier; background:#eee; padding:2px 4px; }
    </style>
    <script src="http://cdn.socket.io/stable/socket.io.js"></script>
    <script>

        // Create SocketIO instance
        var socket = new io.Socket('localhost',{
            port: 8080
        });
        socket.connect(); 

        // Add a connect listener
        socket.on('connect',function() {
            log('<span style="color:green;">Client has connected to the server!</span>');
        });
        // Add a connect listener
        socket.on('message',function(data) {
            log('Received a message from the server:  ' + data);
        });
        // Add a disconnect listener
        socket.on('disconnect',function() {
            log('<span style="color:red;">The client has disconnected!</span>');
        });

        // Sends a message to the server via sockets
        function sendMessageToServer(message) {
            socket.send(message);
            log('<span style="color:#888">Sending "' + message + '" to the server!</span>');
        }

        // Outputs to console and list
        function log(message) {
            var li = document.createElement('li');
            li.innerHTML = message;
            document.getElementById('message-list').appendChild(li);
        }

    </script>
</head>
<body>

    <p>Messages will appear below (and in the console).</p><br />
    <ul id="message-list"></ul>
    <ul style="margin:20px 0 0 20px;">
        <li>Type <code>socket.disconnect()</code> to disconnect</li>
        <li>Type <code>socket.connect()</code> to reconnect</li>
        <li>Type <code>sendMessageToServer('Your Message')</code> to send a message to the server</li>
    </ul>

</body>
</html>

客户端代码旨在通过在chrome检查器中动态调用sendMessageToServer('Your Message')来工作。


当前输出

所以,是时候运行服务器了。 WAMP在线,并转到www / socketiodemo并执行

node app.js

给我输出:

info - socket.io started

现在,转到localhost / socketiodemo,会反复显示以下日志:

XMLHttpRequest cannot load http://localhost:8080/socket.io/xhr-polling//1338578840544. Origin http://localhost is not allowed by Access-Control-Allow-Origin.

XMLHttpRequest cannot load http://localhost:8080/socket.io/xhr-polling//1338578850545. Origin http://localhost is not allowed by Access-Control-Allow-Origin.

现在服务器(节点app.js)开始显示以下消息:

  info  - socket.io started
  warn  - unknown transport: "undefined"
  info  - unhandled socket.io url
  warn  - unknown transport: "undefined"
  info  - unhandled socket.io url
  warn  - unknown transport: "undefined"

此外,在客户端中,执行sendMessageToServer('Hello');只是附加到ul: Sending "hello" to the server!但实际上并没有对服务器做任何事情。服务器只是转储上面的infowarn。客户端也在连续执行上面显示的XMLHttpRequest错误。

你能确定问题出在哪里吗?我实际上已经尝试了很多教程和东西,这是我最接近工作的东西。

如果有人还想建议​​他们知道可行的教程,请这样做。

1 个答案:

答案 0 :(得分:4)

一些Socket.IO的东西随着时间的推移而发生了变化。此外,您可能希望从同一主机/端口提供HTML和Socket.IO JS。试一试:

将index.html移至public目录

这样你就拥有了以下树:

app.js
public/
  index.html
node_modules/
  socket.io
  express
  (whatever else)

修改app.js以投放HTML

将您的app.js更改为以下JavaScript(仅改变前几行):

// Require Express module (to start server) and Socket.IO
var io = require('socket.io'), express = require('express');

var server = express.createServer();

server.use(express.static(__dirname + "/public"));

server.listen(8080);

// Create a Socket.IO instance, passing it our server
var socket = io.listen(server);

// Add a connect listener
socket.sockets.on('connection', function(client){

    // Create periodical which ends a message to the client every 5 seconds
    var interval = setInterval(function() {
        client.send('This is a message from the server!  ' + new Date().getTime());
    },5000);

    // Success!  Now listen to messages to be received
    client.on('message',function(event){
        console.log('Received message from client!',event);
    });
    client.on('disconnect',function(){
        clearInterval(interval);
        console.log('Server has disconnected');
    });

});

使用此代码,当您访问localhost时,您的服务器将使用Express来提供index.html:8080

更改您的Socket.IO代码

index.html中,将您的<script>标记更改为:<script src="/socket.io/socket.io.js"></script>,然后将JavaScript更改为只读(仅第一部分更改):

// Create SocketIO instance
var socket = io.connect();

// Add a connect listener
socket.on('connect',function() {
    log('<span style="color:green;">Client has connected to the server!</span>');
});
// Add a connect listener
socket.on('message',function(data) {
    log('Received a message from the server:  ' + data);
});
// Add a disconnect listener
socket.on('disconnect',function() {
    log('<span style="color:red;">The client has disconnected!</span>');
});

// Sends a message to the server via sockets
function sendMessageToServer(message) {
    socket.send(message);
    log('<span style="color:#888">Sending "' + message + '" to the server!</span>');
}

// Outputs to console and list
function log(message) {
    var li = document.createElement('li');
    li.innerHTML = message;
    document.getElementById('message-list').appendChild(li);
}

启动您的服务器并访问localhost:8080

请注意,这会一起跳过WAMP堆栈; Node.js同时提供Socket.IO代码和静态文件。当您访问localhost:8080时,您应该看到消息。另请注意,您应使用socket.socket.disconnect()断开连接并socket.socket.connect()重新连接。

源代码

此应用的工作版本的源代码位于https://github.com/BinaryMuse/so-10856370;记住npm install express socket.io