[英]Node.js how to use socket.io in express route
在我的一个node.js脚本中,我试图在快速路由中使用socket.io。 我发现了许多类似的问题,并尝试按照建议实施解决方案,但没有任何结果。 可能是因为我对快车路线缺乏了解。 我按照以下链接,
在expressjs路由中使用socket.io而不是在main server.js文件中
这是我的app.js.
const express = require('express');
const app = express();
const server = require('http').createServer(app);
const io = require('socket.io').listen(server);
const PORT = 3000;
server.listen(PORT);
console.log('Server is running');
var api = require('./routes/api');
//app.use('/api', api);
app.use('/api', (req, res) => {
res.sendFile(__dirname + '/api.html');
});
app.get('/', (req, res) => {
res.send("this is home location");
});
并在./routes文件夹中路由文件api.js
var express = require('express');
var router = express.Router();
var fs = require("fs");
var bodyParser = require('body-parser');
const app = express();
const server = require('http').createServer(app);
const io = require('socket.io').listen(server);
console.log("inside api route");
router.get('/', function(req, res, next) {
console.log("api route called");
const connections = [];
var jsonobj = [{name:"john",score:345},{name:"paul",score:678}]
io.sockets.on('connection',(socket) => {
connections.push(socket);
console.log(' %s sockets is connected', connections.length); // this is not printing
socket.on('disconnect', () => {
connections.splice(connections.indexOf(socket), 1);
});
socket.emit('server message', jsonobj);
});
//res.send(jsonobj)
});
module.exports = router;
Socket.emit没有在我正在路由使用上呈现的html页面上显示数据。 我的HTML代码是,
//api.html
<!DOCTYPE html>
<html lang="en">
<body>
<div class="container">
<h1 class="jumbotron">
Node js Socket io with socket route example
</h1>
<div class="results">results</div>
</div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/socket.io/2.0.4/socket.io.js"></script>
<script>
jQuery(document).ready(function() {
var socket = io.connect();
var jsondata = "";
socket.on('server message', function(data){
console.log('got data from server',data)
jsondata = JSON.stringify(data);
//console.log('jsondata',jsondata)
$('.results').html(jsondata);
});
});
</script>
</body>
</html>
请建议我应该在html页面中获取路由套接字数据。 谢谢
乍一看,看起来您正在两次修改URL前缀。 一旦进入app.js,再次进入api.js.
尝试localhost:port / api / api
如果是这种情况,请更改
router.get('/api', function(req, res, next){
至
router.get('/', function(req, res, next){
这将允许您点击localhost:port / api并访问您的端点。
好吧,让我们试着理解为什么你需要首先通过路由中的套接字发送数据。 Websockets用于异步发送数据,而客户端不必发出请求。 如果客户端已经在发出HTTP请求,那么您只需在HTTP响应中发送数据即可。
现在已经说过,显然有一些用例需要根据某些OTHER用户请求的操作将数据发送到某个WebSocket频道。 如果是这种情况,有多种方法可以做到这一点。 一种干净的方法是使用事件驱动的架构 。
尝试这样的事情......在下面找到我的评论 -
const express = require('express');
const router = express.Router();
const fs = require("fs");
const bodyParser = require('body-parser');
const app = express();
const server = require('http').createServer(app);
const io = require('socket.io').listen(server);
// move the socket connection outside of the route controller
// you must register the event listeners before anything else
const connections = [];
io.sockets.on('connection', (socket) => {
connections.push(socket);
console.log(' %s sockets is connected', connections.length); // this is not printing
socket.on('disconnect', () => {
connections.splice(connections.indexOf(socket), 1);
});
});
// Event emitter for sending and receving custom events
const EventEmitter = require('events').EventEmitter;
const myEmitter = new EventEmitter();
myEmitter.on('my-event', function (jsonobj) {
// do something here like broadcasting data to everyone
// or you can check the connection with some logic and
// only send to relevant user
connections.forEach(function(socket) {
socket.emit('server message', jsonobj);
});
});
router.get('/some-route', function (req, res, next) {
const jsonobj = [{ name: "john", score: 345 }, { name: "paul", score: 678 }]
// emit your custom event with custom data
myEmitter.emit('my-event', jsonobj);
// send the response to avoid connection timeout
res.send({ok: true});
});
module.exports = router;
我自己刚开始明白这一点,但我认为你所处的地方很近。
在你的app.js中添加到文件的末尾:
const express = require('express');
const app = express();
const server = require('http').createServer(app);
const io = require('socket.io').listen(server);
const PORT = 3000;
server.listen(PORT);
console.log('Server is running');
var api = require('./routes/api');
//app.use('/api', api);
app.use('/api', (req, res) => {
res.sendFile(__dirname + '/api.html');
});
app.get('/', (req, res) => {
res.send("this is home location");
});
app.set("socketio", io); // <== this line
它将“io”变量存储在“socketio”中。 你可以抓住任何其他“.js”文件。
var express = require('express');
var router = express.Router();
var fs = require("fs");
var bodyParser = require('body-parser');
const app = express();
const server = require('http').createServer(app);
//const io = require('socket.io').listen(server); // <== change this
const io = app.get("socketio"); // <== to this
console.log("inside api route");
router.get('/', function(req, res, next) {
console.log("api route called");
const connections = [];
var jsonobj = [{name:"john",score:345},{name:"paul",score:678}]
io.sockets.on('connection',(socket) => {
connections.push(socket);
console.log(' %s sockets is connected', connections.length); // this is not printing
socket.on('disconnect', () => {
connections.splice(connections.indexOf(socket), 1);
});
socket.emit('server message', jsonobj);
});
//res.send(jsonobj)
});
module.exports = router;
您应该使用其他“.js”文件中所需的任何其他变量。
另请注意,在文件中,您将再次设置变量。 最好像我用“io”向你展示一样。 我设置的其他文件中唯一的变量是“app”本身。
希望这可以帮助...
您尝试在单个项目中的两个不同位置创建和启动服务器,这很不方便。 你需要一些清理,就是这样。
app.js
const express = require('express');
const app = express();
const server = require('http').createServer(app);
const io = require('socket.io').listen(server);
// Listen to sockets here instead of listening in routes/api.js
const connections = [];
var jsonobj = [{name:"john",score:345},{name:"paul",score:678}]
io.sockets.on('connection',(socket) => {
connections.push(socket);
console.log(' %s sockets is connected', connections.length); // this is not printing
socket.on('disconnect', () => {
connections.splice(connections.indexOf(socket), 1);
});
socket.emit('server message', jsonobj);
});
const PORT = 3000;
server.listen(PORT);
console.log('Server is running');
var api = require('./routes/api');
//app.use('/api', api);
app.use('/api', (req, res) => {
res.sendFile(__dirname + '/api.html');
});
app.get('/', (req, res) => {
res.send("this is home location");
});
路线/ api.js
var express = require('express');
var router = express.Router();
var fs = require("fs");
var bodyParser = require('body-parser');
// Comment these out
// const app = express();
// const server = require('http').createServer(app);
// const io = require('socket.io').listen(server);
console.log("inside api route");
router.get('/', function(req, res, next) {
console.log("api route called");
// Comment these out
// const connections = [];
// var jsonobj = [{name:"john",score:345},{name:"paul",score:678}]
// io.sockets.on('connection',(socket) => {
// connections.push(socket);
// console.log(' %s sockets is connected', connections.length); // this is not printing
// socket.on('disconnect', () => {
// connections.splice(connections.indexOf(socket), 1);
// });
// socket.emit('server message', jsonobj);
// });
//res.send(jsonobj)
});
module.exports = router;
保留你的api.html 。 希望这可以帮助。
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