运行于本地127.0.0.1:5000的node.js服务器

一个运行于本地5000端口的node.js服务器，能分辨用户GET请求读取不同的HTML页面,读取GET参数切换中英文界面。

2021-10-05 144211.png

const fs = require("fs");//使用require函数导入fs模块，使用const储存于fs
const http = require("http");//使用require函数导入http模块，使用const储存于http
const port = 5000;
const ip = "127.0.0.1";
const sendResponse = (filename, statusCode, response) => {//用来读取和发送html源代码
    fs.readFile(./${filename}, (error, data) => {//读取html文件
        if (error) {//判断是否成功读取文件
            response.statusCode = 500;//设置错误码
            response.setHeader("Content-Type", "text/plain");//设置返回格式
            response.end("Sorry, internal error");//使用end返回内容
        }else{
            response.statusCode = statusCode;
            response.setHeader("Content-Type", "text/html");
            response.end(data);
        }
    })
}
const server = http.createServer( (request, response) => {//使用http模块内的createServe来创建服务器并储存于server,并在服务器内放入请求监听器
    console.log(request.url, request.method);//识别客户端输入的url和请求方法
    const method = request.method;
    let url = request.url;
    if (method === "GET"){//判断请求是否为GET
        const requestUrl = new URL(url, http://${ip}:${port});//使用URL object获取客户端url
        console.log(requestUrl);
        console.log(requestUrl.searchParams.get("lang"));
        url = requestUrl.pathname;//获取路径名
        const lang = requestUrl.searchParams.get("lang");//创建lang并给值
        let selector;
        if (lang === null|| lang === "en"){//判断lang值，分配到不同页面
            selector = "";
        }else if(lang === "zh"){
            selector = "-zh";
        }else{
            selector = "";
        }
        if (url === "/"){
            sendResponse(index${selector}.html, 200, response);
        } else if (url === "/about.html"){
            sendResponse(about${selector}.html, 200, response);
        } else {
            sendResponse(404${selector}.html, 404, response);
        }
        } else {
        
    }
});
server.listen(port, ip, () => {//使用sever Object里的listen函数监听来自前端的请求
    console.log(Server is running at http://${ip}:${port})
});

Httpserver.rar