Summarize the commonly used port routing setting methods in Nodejs

Nodejs is a very popular server-side JavaScript runtime environment and is widely used in web application development. In Nodejs, ports are a way to identify different network applications or services. Each application or service can use a different port as its network address. Therefore, it is crucial to be proficient in Nodejs port routing settings.

Port routing is a technology that maps different ports to different network applications or services. In Nodejs, port routing can be implemented using different methods. This article will introduce the commonly used port routing settings in Nodejs to help developers quickly deploy and maintain network applications or services.

1. Manually set port routing

In Nodejs, you can map different ports to different applications or services by manually setting port routing. Manually setting port routing requires using the http module of Nodejs to handle different network requests by listening to different ports.

Here is a simple sample code for mapping different ports to different network applications:

var http = require('http');

// 创建一个HTTP服务器
var server = http.createServer(function(req, res) {

    // 访问端口为80
    if(req.url === '/') {
        res.writeHead(200, {'Content-Type': 'text/plain'});
        res.end('Welcome to port 80\n');
    }

    // 访问端口为8080
    else if(req.url === '/app') {
        res.writeHead(200, {'Content-Type': 'text/plain'});
        res.end('Welcome to app on port 8080\n');
    }

    // 访问端口为9000
    else if(req.url === '/service') {
        res.writeHead(200, {'Content-Type': 'text/plain'});
        res.end('Welcome to service on port 9000\n');
    }

    // 其他访问
    else {
        res.writeHead(404, {'Content-Type': 'text/plain'});
        res.end('Page not found!\n');
    }
});

// 启动服务器监听端口
server.listen(80);
server.listen(8080);
server.listen(9000);

In the above sample code, different ports are handled by creating an HTTP server. network request. Listen on ports 80, 8080 and 9000 respectively and respond on different URL paths. If the access URL is the root path "/", then "Welcome to port 80" is returned. If the access URL is "/app", then "Welcome to app on port 8080" is returned. If the access URL is "/service", then "Welcome to port 80" is returned. "Welcome to service on port 9000". Otherwise, a 404 error message is returned.

2. Use third-party modules to implement port routing

Although it is relatively simple to manually set port routing, it is not convenient in practical applications. Therefore, we can use some third-party modules to help us implement port routing.

Express is a popular web application framework for Nodejs that can easily implement port routing. The Router middleware in Express can help us define different routes and map them to different HTTP methods and URL paths.

The following is a sample code that uses Express to implement port routing:

var express = require('express');
var app = express();

// 访问端口为80
app.get('/', function(req, res) {
    res.send('Welcome to port 80!');
});

// 访问端口为8080
app.get('/app', function(req, res) {
    res.send('Welcome to app on port 8080!');
});

// 访问端口为9000
app.get('/service', function(req, res) {
    res.send('Welcome to service on port 9000!');
});

// 监听端口
app.listen(80);
app.listen(8080);
app.listen(9000);

In the above sample code, port routing is implemented by calling the Express framework and creating a new Express application instance. Use the app.get method to define different routes and map them to different HTTP methods and URL paths. If the access URL is the root path "/", then "Welcome to port 80" is returned. If the access URL is "/app", then "Welcome to app on port 8080" is returned. If the access URL is "/service", then "Welcome to port 80" is returned. "Welcome to service on port 9000". And use the app.listen method to listen to different ports.

Summary

Nodejs is a very powerful server-side JavaScript running environment that can implement mapping of different network applications or services through port routing. This article introduces two common methods to implement port routing settings: manually setting port mapping and using third-party modules to implement port routing. Developers can choose the appropriate port routing setting method according to their actual needs.

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