jQuery Nodejs & socket io：警告 - 引发错误：错误：监听 EADDRINUSE
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Nodejs & socket io : warn - error raised: Error: listen EADDRINUSE
提问by masterofdestiny
I am giving a try to Node.js with socket.io
我正在尝试使用 socket.io 尝试 Node.js
Now here is my scenario i am ubuntu 12.04 user and i have folder pp on desktop
现在这是我的场景，我是 ubuntu 12.04 用户，桌面上有文件夹 pp
inside that i am putted server file i.e app.js
在里面我放了服务器文件，即 app.js
Here is the content
这是内容
var fs = require('fs')
, http = require('http')
, socketio = require('socket.io');
var server = http.createServer(function(req, res) {
res.writeHead(200, { 'Content-type': 'text/html'});
res.end(fs.readFileSync(__dirname + '/index.html'));
}).listen(8080, function() {
console.log('Listening at: http://localhost:8080');
});
socketio.listen(server).on('connection', function (socket) {
socket.on('message', function (msg) {
console.log('Message Received: ', msg);
socket.broadcast.emit('message', msg);
});
});
Now in the same folder i have another file index.html like
现在在同一个文件夹中我有另一个文件 index.html 喜欢
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
<script src="/socket.io/socket.io.js"></script>
<script>
$(function(){
var iosocket = io.connect();
iosocket.on('connect', function () {
$('#incomingChatMessages').append($('<li>Connected</li>'));
iosocket.on('message', function(message) {
$('#incomingChatMessages').append($('<li></li>').text(message));
});
iosocket.on('disconnect', function() {
$('#incomingChatMessages').append('<li>Disconnected</li>');
});
});
$('#outgoingChatMessage').keypress(function(event) {
if(event.which == 13) {
event.preventDefault();
iosocket.send($('#outgoingChatMessage').val());
$('#incomingChatMessages').append($('<li></li>').text($('#outgoingChatMessage').val()));
$('#outgoingChatMessage').val('');
}
});
});
</script>
</head>
<body>
Incoming Chat: <ul id="incomingChatMessages"></ul>
<input type="text" id="outgoingChatMessage">
</body>
when i am trying to run the app.js useing node like
当我尝试使用 node 运行 app.js 时
node app.js
I am getting the error
我收到错误
warn - error raised: Error: listen EADDRINUSE
I go through some doc and found that port are busy so restarted the system but still i am getting the same error .
我查看了一些文档，发现端口很忙，因此重新启动了系统，但我仍然遇到相同的错误。
Please tell me what might i am doing wrong .
请告诉我我可能做错了什么。
回答by Charles
Try another port. 8080 is usually used by tomcat e.g.
尝试另一个端口。8080 通常被 tomcat 使用，例如
Use netstat -a -vto know which port are currently used.
使用netstat -a -v知道哪些端口正在使用。
回答by ashley
It looks to me that your not connecting to the host on the client side:
在我看来，您没有连接到客户端的主机：
var iosocket = io.connect('http://localhost:8080');
回答by Brmm
You are not connecting to your server, this is wrong:
您没有连接到您的服务器，这是错误的：
var iosocket = io.connect();
this is right:
这是对的：
var iosocket = io.connect('http://localhost:8080');
Also your port 8080 is used on your server by "http-proxy", try an other port.
此外，您的服务器上的端口 8080 由“http-proxy”使用，请尝试其他端口。
回答by popartmogul
An ultra-silly/simple possibility is to make sure you don't have multiple terminal windows open. I got this error and realized I had a second pre-existing connection that I had started up my app with. When I closed it and restarted the app the error went away.
一个非常愚蠢/简单的可能性是确保您没有打开多个终端窗口。我收到这个错误，并意识到我有第二个预先存在的连接，我用它来启动我的应用程序。当我关闭它并重新启动应用程序时，错误消失了。
回答by Ruslan
Here is an example for beginners of how you can set up NodeJS + Express + SocketIO so that you have no EADDRINUSE error for the second time you start your app:
这是初学者的示例，说明如何设置 NodeJS + Express + SocketIO 以便第二次启动应用程序时不会出现 EADDRINUSE 错误：
'use strict';
// Init
var http = require('http');
var express = require('express');
var socketIO = require('socket.io');
var cors = require('cors');
// Create Server app
var app = express();
var server = http.createServer(app);
var io = socketIO(server);
// Socket.io settings
io.set('browser client minification', true);
io.set('browser client etag', true);
io.set('browser client gzip', true);
io.set('browser client expires', true);
// Starting Express server
server.listen(serverPort, function() {
console.log(chalk.green('Server is running on localhost:' + serverPort + '...'));
});
// Middleware
app.use(cors());
// Routes
app.get('/', function(req, res) {
res.send("Hello world!");
console.log("Root visited!");
// Broadcast socketIO message inside Express
io.emit('new_message', "Hello world!");
});
// Socket.io
var connections = [];
var title = "Untitled";
io.sockets.on('connection', (socket) => {
socket.once('disconnect', () => {
connections.splice(connections.indexOf(socket), 1);
socket.disconnect();
console.log('Disconnected: %s. Remained: %s.', socket.id, connections.length)
});
// ...
connections.push(socket);
console.log('Connected: %s. Total: %s', socket.id, connections.length);
});
I think this is a useful example and I hope it will help someone who encountered a problem setting this all up.
我认为这是一个有用的例子，我希望它能帮助那些在设置这一切时遇到问题的人。
