const http = require("http");
// 創(chuàng)建服務(wù)器實(shí)例
const app = http.createServer((req, res) => {
    // 設(shè)置響應(yīng)頭，指定內(nèi)容類型和編碼
    res.setHeader("Content-Type", "text/html;charset=utf-8");
    // 根據(jù)請(qǐng)求路徑返回不同內(nèi)容
    switch (req.url) {
        case "/":
            res.end("歡迎訪問主頁！");
            break;
        case "/about":
            res.end("這是關(guān)于頁面！");
            break;
        default:
            res.statusCode = 404;
            res.end("404 - 頁面未找到");
    }
});
// 監(jiān)聽端口并啟動(dòng)服務(wù)器
app.listen(5000, () => {
    console.log("服務(wù)器已啟動(dòng)！監(jiān)聽在 http://localhost:5000");
});
// 添加錯(cuò)誤處理
app.on("error", (error) => {
    console.error(`服務(wù)器啟動(dòng)失敗: ${error.message}`);
});    

const http = require("http");
const fs = require("fs").promises;
const path = require("path");
// 定義靜態(tài)資源目錄
const STATIC_DIR = path.join(__dirname, "static");
// 內(nèi)容類型映射表
const CONTENT_TYPES = {
    ".html": "text/html",
    ".css": "text/css",
    ".js": "text/javascript",
    ".json": "application/json",
    ".png": "image/png",
    ".jpg": "image/jpeg",
    ".gif": "image/gif",
    ".svg": "image/svg+xml",
    ".txt": "text/plain"
};
const app = http.createServer(async (req, res) => {
    try {
        // 構(gòu)建文件路徑
        let filePath = path.join(STATIC_DIR, req.url === "/" ? "index.html" : req.url);
        // 檢查文件是否存在
        await fs.access(filePath);
        // 獲取文件狀態(tài)
        const stat = await fs.stat(filePath);
        if (stat.isDirectory()) {
            // 如果是目錄，嘗試默認(rèn)文件
            filePath = path.join(filePath, "index.html");
            await fs.access(filePath);
        }
        // 獲取文件擴(kuò)展名并確定內(nèi)容類型
        const extname = path.extname(filePath);
        const contentType = CONTENT_TYPES[extname] || "application/octet-stream";
        // 設(shè)置響應(yīng)頭并發(fā)送文件內(nèi)容
        res.setHeader("Content-Type", contentType);
        const fileContent = await fs.readFile(filePath);
        res.end(fileContent);
    } catch (error) {
        // 處理錯(cuò)誤
        res.statusCode = 404;
        res.end("404 - 文件未找到");
    }
});
app.listen(3000, () => {
    console.log("服務(wù)器監(jiān)聽在 http://localhost:3000");
});    

const http = require("http");
const url = require("url");
const qs = require("querystring");
const app = http.createServer((req, res) => {
    res.setHeader("Content-Type", "text/html;charset=utf-8");
    // 解析URL和查詢參數(shù)
    const parsedUrl = url.parse(req.url, true);
    const pathname = parsedUrl.pathname;
    const query = parsedUrl.query;
    if (pathname === "/") {
        // 返回表單頁面
        const formHtml = `
            <form method="GET" action="/api">
                <input type="text" name="username" placeholder="用戶名">
                <input type="password" name="password" placeholder="密碼">
                <button type="submit">提交</button>
            </form>
        `;
        res.end(formHtml);
    } else if (pathname === "/api") {
        // 處理GET請(qǐng)求參數(shù)
        res.end(`收到GET請(qǐng)求，參數(shù)：${JSON.stringify(query)}`);
    } else {
        res.statusCode = 404;
        res.end("404 - 頁面未找到");
    }
});
app.listen(8888, () => {
    console.log("服務(wù)器已啟動(dòng)！地址為: http://localhost:8888");
});    

const http = require("http");
const qs = require("querystring");
const app = http.createServer((req, res) => {
    res.setHeader("Content-Type", "text/html;charset=utf-8");
    if (req.url === "/") {
        // 返回表單頁面
        const formHtml = `
            <form method="POST" action="/api">
                <input type="text" name="username" placeholder="用戶名">
                <input type="password" name="password" placeholder="密碼">
                <button type="submit">提交</button>
            </form>
        `;
        res.end(formHtml);
    } else if (req.url === "/api" && req.method === "POST") {
        // 處理POST請(qǐng)求
        let body = "";
        // 監(jiān)聽data事件，收集數(shù)據(jù)塊
        req.on("data", (chunk) => {
            body += chunk.toString();
        });
        // 監(jiān)聽end事件，數(shù)據(jù)接收完成
        req.on("end", () => {
            // 解析表單數(shù)據(jù)
            const formData = qs.parse(body);
            // 返回處理結(jié)果
            res.end(`收到POST請(qǐng)求，參數(shù)：${JSON.stringify(formData)}`);
        });
    } else {
        res.statusCode = 404;
        res.end("404 - 頁面未找到");
    }
});
app.listen(8888, () => {
    console.log("服務(wù)器已啟動(dòng)！地址為: http://localhost:8888");
});