404 Not Found

//-----------------------------------------------------------------------
// Copyright (c) TEngine. All rights reserved. 
// Author: TangXiao
// Date:   2022/5/14 16:29:13
//-----------------------------------------------------------------------
const http = require("http");
const url = require("url");
const fs = require("fs");
const path = require("path");
const mime = {
    css: "text/css",
    gif: "image/gif",
    html: "text/html",
    ico: "image/x-icon",
    jpeg: "image/jpeg",
    jpg: "image/jpeg",
    js: "text/javascript",
    json: "application/json",
    pdf: "application/pdf",
    png: "image/png",
    svg: "image/svg+xml",
    swf: "application/x-shockwave-flash",
    tiff: "image/tiff",
    txt: "text/plain",
    wav: "audio/x-wav",
    wma: "audio/x-ms-wma",
    wmv: "video/x-ms-wmv",
    xml: "text/xml",
};
const port = 8088;

const httpServer = http.createServer((request, response) => {
    const requestUrl = request.url;
    let pathName = url.parse(requestUrl).pathname;

    // 对路径解码，防止中文乱码
    pathName = decodeURI(pathName);

    // 绝对路径
    const filePath = path.resolve(__dirname + pathName);

    // 扩展名
    let ext = path.extname(pathName);
    ext = ext ? ext.slice(1) : "unknown";

    // 未知的类型一律用"text/plain"类型
    const contentType = mime[ext] || "text/plain";

    // fs.stat()方法用于判断给定的路径是否存在
    fs.stat(filePath, (err, stats) => {
        // 路径不存在，则返回404
        if (err) {
            response.writeHead(404, { "content-type": "text/html" });
            response.end("<h1>404 Not Found</h1>");
        }
        // 如果是文件
        if (!err && stats.isFile()) {
            response.writeHead(200, { "content-type": contentType });
            // 建立流对象，读文件
            const stream = fs.createReadStream(filePath);
            // 错误处理
            stream.on("error", function() {
                response.writeHead(500, { "content-type": contentType });

                response.end("<h1>500 Server Error</h1>");
            });
            // 读取文件
            stream.pipe(response);
            //response.end(); // 这个地方有坑，加了会关闭对话，看不到内容了
        }
        // 如果是路径
        if (!err && stats.isDirectory()) {
            let html = " <head><meta charset = 'utf-8'/></head>";
            // 读取该路径下文件
            fs.readdir(filePath, (err, files) => {
                if (err) {
                    response.writeHead(500, { "content-type": contentType });
                    response.end("<h1>路径读取失败！</h1>");
                } else {
                    for (const file of files) {
                        if (file === "index.html") {
                            response.writeHead(200, { "content-type": "text/html" });
                            response.end(file);
                            break;
                        }
                        html += `<div><a href='${file}'>${file}</a></div>`;
                    }
                    response.writeHead(200, { "content-type": "text/html" });
                    response.end(html);
                }
            });
        }
    });
});

httpServer.listen(port, function() {
    console.log(`File Service: ${port}`);
});