四种语言实现最简单的web server

语言：Java

框架：Spring Boot

package com.example.springboot01.controller;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class indexController {

    @RequestMapping("/")
    public String Index(){
        return "hello world Spring Boot";
    }
}

语言：JavaScript(Node.js)

框架：Express

const express = require('express')
const  app = express()
app.get('/',(req,res)=>{
    res.send('hello world Express')
})
app.listen(10000,()=>{
    console.log('开始监听端口:10000')
})

语言：Python

框架：Flask

from flask import Flask
app = Flask(__name__)
@app.route('/')
def index():
    return 'hello world Flask'
if __name__ == '__main__':
    print('开始监听端口:5000')
    app.run()

语言：C#

框架：Asp.Net Web Api

using System;
using System.Web.Mvc;

namespace WebApplication1.Controllers
{
    public class HomeController : Controller
    {
        public String Index()
        {
            return "hello world Asp.Net Web Api";
        }        
    }
}