作一个记录。

github:
https://github.com/aguncn/bifang-app-demo-src

一，java(spring boot)

package learn.springboot.helloworld;


import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.web.bind.annotation.*;
/**
 * Created by mac on 2021/01/04.
 */
@RestController
@EnableAutoConfiguration
public class Application {

    @RequestMapping("/")
    public String home() {
        return "Hello, Java Spring Boot!";
    }

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

二，go

package main

import (
    "fmt"
    "log"
    "net/http"
)

func doRequest(w http.ResponseWriter, r *http.Request) {
    fmt.Fprintf(w, "Hello Golang!") //这个写入到w的是输出到客户端的
}
func main() {
    http.HandleFunc("/", doRequest)          //设置访问的路由
    err := http.ListenAndServe(":9090", nil) //设置监听的端口
    if err != nil {
        log.Fatal("ListenAndServe: ", err)
    }
}

三，python(flask)

from flask import Flask

app = Flask(__name__)


@app.route("/")
def index():
    return "Hello, Flask!"


if __name__ == '__main__':
    app.run()

四，node.js

const http = require('http');

http.createServer(function(request, response) {
  // 设置响应头
  response.writeHeader(200, {
    "Content-Type" : "text/plain"
  });
  // 响应主体为 "Hello world!"
  response.write("Hello Node.js!");
  response.end();
})
// 设置监听端口为9000
.listen(9000);