我之前从未真正使用过Socket.io,所以我不明白它是如何工作的。这就是我开始学习本教程的原因:
http://danielnill.com/nodejs-tutorial-with-socketio/
不幸的是,它对于错误很可怕,而且我找到了一个我似乎无法修复的错误。
我在我的个人服务器上运行它,该服务器在Ubuntu上设置了典型的LAMP服务器。显然,这个练习并没有使用任何服务器资源,所以它只是在www文件夹中,没有任何有益的理由。
所以要连接到我的服务器,我可以转到http://computername/
但是要查看套接字页面,我转到http://computername:8001/
我的项目文件夹包含两个文件," server.js"和" socket.html"。
启动项目后,我将node.js更新为0.10.18,并使用" sudo npm install socket.io"
将Socket.io安装到目录中这是server.js:
var http = require('http');
var url = require('url');
var fs = require('fs');
var io = require('socket.io');
var server = http.createServer(function(request, response){
console.log('Connection');
var path = url.parse(request.url).pathname;
var waitToEnd = false;
switch(path){
case "/":
console.log("Returning homepage");
response.writeHead(200, {'Content-Type':'text/html'});
response.write('<strong>Hello World</strong>');
break;
case "/socket.html":
waitToEnd = true;
console.log("Returning socket page.");
fs.readFile(__dirname + path, function(error, data){
if(error){
console.log("Error...");
response.writeHead(404);
response.write('ERROR 404');
}
else{
console.log("Success...");
response.writeHead(200, {'Content-Type': 'text/html'});
response.write(data, "utf8");
}
response.end();
console.log("Continuing...");
});
break;
default:
response.writeHead(404);
response.write('ERROR 404');
break;
}
if (!waitToEnd){
response.end();
}
});
server.listen(8001);
ioOutput = io.listen(server);
这是socket.html:
<html>
<head>
<script src="/socket.io/socket.io.js"></script>
</head>
<body>
<script>
var socket = io.connect();
</script>
<div>This is our socket.html file</div>
</body>
</html>
每当我启动服务器并导航到socket.html时,它会加载页面信息,但会立即收到以下错误:
GET http://computername:8001/socket.io/?EIO=3&transport=polling&t=1413317092992-41 net::ERR_CONNECTION_REFUSED
socket.io.js:2680Request.create
socket.io.js:2680Request
socket.io.js:2614XHR.request
socket.io.js:2555XHR.doPoll
socket.io.js:2585Polling.poll
socket.io.js:2951Polling.doOpen
socket.io.js:2895Transport.open
socket.io.js:2106Socket.open
socket.io.js:1580Socket
socket.io.js:1467Socket
socket.io.js:1419Manager.open.Manager.connect
socket.io.js:272(anonymous function)
一旦得到这个,我的服务器崩溃了一个巨大的转储。我能在其中找到的最类似错误的输出表示&#34; TypeError:对象函数缓冲区(主题,编码,偏移)&#34; ...
我在其他地方读过类似的错误与重复连接有关,我注意到如果我拿出试图建立连接的代码,只留下socket.io代码和其他基本服务器代码,它每隔几秒就会注册一次连接,即使我从未告诉过它。有人对此有解释吗?
答案 0 :(得分:0)
您需要使用服务器实例来实现socket.io服务器而不是使用listen,否则它将创建自己的http服务器。
server.js:
var http = require('http');
var url = require('url');
var fs = require('fs');
var server = http.createServer(handler);
var io = require('socket.io')(server);
var handler = function(request, response){
console.log('Connection');
var path = url.parse(request.url).pathname;
var waitToEnd = false;
switch(path){
case "/":
console.log("Returning homepage");
response.writeHead(200, {'Content-Type':'text/html'});
response.write('<strong>Hello World</strong>');
break;
case "/socket.html":
waitToEnd = true;
console.log("Returning socket page.");
fs.readFile(__dirname + path, function(error, data){
if(error){
console.log("Error...");
response.writeHead(404);
response.write('ERROR 404');
}
else{
console.log("Success...");
response.writeHead(200, {'Content-Type': 'text/html'});
response.write(data, "utf8");
}
response.end();
console.log("Continuing...");
});
break;
default:
response.writeHead(404);
response.write('ERROR 404');
break;
}
if (!waitToEnd){
response.end();
}
};
console.log("server listening");
server.listen(8001);
io.on('connection', function (socket) {
console.log("socket connected");
socket.emit('test', { hello: 'world' });
socket.on('test_in', function (data) {
console.log(data);
});
});
client.js:
<script src="/socket.io/socket.io.js"></script>
<script>
var socket = io();
socket.on('test', function (data) {
console.log(data);
socket.emit('test_in', { hello: 'too' });
});
</script>