diff --git a/README.net.md b/README.net.md
index 5dab4aa..c6ecd68 100644
--- a/README.net.md
+++ b/README.net.md
@@ -2,7 +2,7 @@
 
 > 返回 [README.md](README.md)
 
-查看端口被谁占用、本机监听了哪些端口、测试连通性、DNS 查询、路由追踪、HTTP 诊断、网卡信息、连接统计、网速测试。
+查看端口被谁占用、本机监听了哪些端口、测试连通性、DNS 查询、路由追踪、HTTP 诊断、网卡信息、连接统计、网速测试、启动 HTTP 文件服务器。
 
 ```bash
 kopsc net pids 8080                # 谁占用了 8080 端口（输出 PID）
@@ -14,6 +14,7 @@ kopsc net curl https://example.com # HTTP 诊断
 kopsc net iface                    # 查看网卡和 IP 地址
 kopsc net conn                     # 查看 TCP 连接状态统计
 kopsc net speed                    # 简单网速测试
+kopsc net http                     # 启动 HTTP 文件服务器
 ```
 
 ## 端口占用查询（net.pids）
@@ -186,3 +187,45 @@ kopsc net speed --upload           # 只测上传
 | `--size` / `-s` | 测试文件大小（默认 10M，支持 K/M/G 后缀） |
 | `--download` / `-d` | 只测下载 |
 | `--upload` / `-u` | 只测上传 |
+
+## HTTP 文件服务器（net.http）
+
+```bash
+kopsc net http                    # 当前目录起 HTTP 服务，端口 8000
+kopsc net http -p 9000            # 指定端口
+kopsc net http --dir /var/www     # 指定目录
+kopsc net http --upload           # 启用上传功能
+```
+
+快速启动一个 HTTP 文件服务器，方便局域网内共享文件。纯 Go 实现，不依赖外部工具。
+
+输出示例：
+
+```
+=== HTTP 文件服务器 ===
+
+目录: /Users/odboy/projects
+地址:
+  http://localhost:8000
+  http://192.168.1.100:8000
+
+按 Ctrl+C 停止
+```
+
+### 选项
+
+| 选项 | 说明 |
+| --- | --- |
+| `--dir` / `-d` | 服务目录（默认当前目录） |
+| `--port` / `-p` | 端口号（默认 8000） |
+| `--upload` / `-u` | 启用上传功能（POST /upload） |
+
+### 上传功能
+
+启用 `--upload` 后，可通过 POST 请求上传文件：
+
+```bash
+curl -F "file=@document.pdf" http://localhost:8000/upload
+```
+
+上传的文件会保存到服务目录，同名文件自动添加后缀避免覆盖。
diff --git a/internal/executor/nethttp.go b/internal/executor/nethttp.go
new file mode 100644
index 0000000..024dc47
--- /dev/null
+++ b/internal/executor/nethttp.go
@@ -0,0 +1,281 @@
+package executor
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"mime"
+	"net"
+	"net/http"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"time"
+)
+
+// runNetHTTP implements `kopsc net http`: start a simple HTTP file server.
+func runNetHTTP(ctx context.Context, req BuiltinRequest) error {
+	opts, err := parseNetHTTPArgs(req.Args)
+	if err != nil {
+		return err
+	}
+
+	dir := opts.dir
+	if dir == "" {
+		dir = "."
+	}
+
+	absDir, err := filepath.Abs(dir)
+	if err != nil {
+		return fmt.Errorf("无法解析路径 %q: %w", dir, err)
+	}
+
+	if info, err := os.Stat(absDir); err != nil {
+		return fmt.Errorf("目录 %q 不存在: %w", dir, err)
+	} else if !info.IsDir() {
+		return fmt.Errorf("%q 不是目录", dir)
+	}
+
+	port := opts.port
+	addr := fmt.Sprintf(":%d", port)
+
+	// Check if port is available
+	listener, err := net.Listen("tcp", addr)
+	if err != nil {
+		return fmt.Errorf("端口 %d 已被占用: %w", port, err)
+	}
+
+	// Get local IP addresses
+	ips := getLocalIPs()
+
+	fmt.Fprintf(req.Stdout, "=== HTTP 文件服务器 ===\n\n")
+	fmt.Fprintf(req.Stdout, "目录: %s\n", absDir)
+	fmt.Fprintf(req.Stdout, "地址:\n")
+	fmt.Fprintf(req.Stdout, "  http://localhost:%d\n", port)
+	for _, ip := range ips {
+		fmt.Fprintf(req.Stdout, "  http://%s:%d\n", ip, port)
+	}
+	if opts.upload {
+		fmt.Fprintf(req.Stdout, "\n上传功能已启用\n")
+		fmt.Fprintf(req.Stdout, "POST /upload 可上传文件\n")
+	}
+	fmt.Fprintf(req.Stdout, "\n按 Ctrl+C 停止\n")
+
+	mux := http.NewServeMux()
+
+	if opts.upload {
+		mux.HandleFunc("/upload", func(w http.ResponseWriter, r *http.Request) {
+			if r.Method != http.MethodPost {
+				http.Error(w, "请使用 POST 方法上传", http.StatusMethodNotAllowed)
+				return
+			}
+			handleUpload(w, r, absDir, req)
+		})
+	}
+
+	// File server with directory listing
+	fileServer := http.FileServer(http.Dir(absDir))
+	mux.Handle("/", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		// Log request
+		fmt.Fprintf(req.Stdout, "[%s] %s %s\n", time.Now().Format("15:04:05"), r.Method, r.URL.Path)
+		fileServer.ServeHTTP(w, r)
+	}))
+
+	server := &http.Server{
+		Handler:      mux,
+		ReadTimeout:  30 * time.Second,
+		WriteTimeout: 30 * time.Second,
+	}
+
+	// Handle context cancellation
+	go func() {
+		<-ctx.Done()
+		server.Shutdown(context.Background())
+	}()
+
+	if err := server.Serve(listener); err != nil && err != http.ErrServerClosed {
+		return err
+	}
+	return nil
+}
+
+type netHTTPOptions struct {
+	dir    string
+	port   int
+	upload bool
+}
+
+func parseNetHTTPArgs(args []string) (netHTTPOptions, error) {
+	opts := netHTTPOptions{
+		port: 8000, // default port
+	}
+
+	for i := 0; i < len(args); i++ {
+		arg := args[i]
+		switch {
+		case arg == "--":
+			// Ignore everything after --
+			return opts, nil
+		case arg == "--dir" || arg == "-d":
+			if i+1 >= len(args) {
+				return opts, fmt.Errorf("%s 缺少目录参数", arg)
+			}
+			i++
+			opts.dir = args[i]
+		case strings.HasPrefix(arg, "--dir="):
+			opts.dir = strings.TrimPrefix(arg, "--dir=")
+		case arg == "--port" || arg == "-p":
+			if i+1 >= len(args) {
+				return opts, fmt.Errorf("%s 缺少端口参数", arg)
+			}
+			i++
+			port, err := strconv.Atoi(args[i])
+			if err != nil || port < 1 || port > 65535 {
+				return opts, fmt.Errorf("无效的端口号: %q", args[i])
+			}
+			opts.port = port
+		case strings.HasPrefix(arg, "--port="):
+			portStr := strings.TrimPrefix(arg, "--port=")
+			port, err := strconv.Atoi(portStr)
+			if err != nil || port < 1 || port > 65535 {
+				return opts, fmt.Errorf("无效的端口号: %q", portStr)
+			}
+			opts.port = port
+		case arg == "--upload" || arg == "-u":
+			opts.upload = true
+		case strings.HasPrefix(arg, "-") && arg != "-":
+			return opts, fmt.Errorf("未知选项 %q", arg)
+		default:
+			// Treat as directory
+			opts.dir = arg
+		}
+	}
+
+	return opts, nil
+}
+
+func getLocalIPs() []string {
+	var ips []string
+
+	ifaces, err := net.Interfaces()
+	if err != nil {
+		return ips
+	}
+
+	for _, iface := range ifaces {
+		// Skip down interfaces and loopback
+		if iface.Flags&net.FlagUp == 0 || iface.Flags&net.FlagLoopback != 0 {
+			continue
+		}
+
+		addrs, err := iface.Addrs()
+		if err != nil {
+			continue
+		}
+
+		for _, addr := range addrs {
+			var ip net.IP
+			switch v := addr.(type) {
+			case *net.IPNet:
+				ip = v.IP
+			case *net.IPAddr:
+				ip = v.IP
+			}
+
+			if ip == nil || ip.IsLoopback() {
+				continue
+			}
+
+			// Only IPv4 for simplicity
+			if ip.To4() != nil {
+				ips = append(ips, ip.String())
+			}
+		}
+	}
+
+	return ips
+}
+
+func handleUpload(w http.ResponseWriter, r *http.Request, dir string, req BuiltinRequest) {
+	// Parse multipart form (max 100MB)
+	if err := r.ParseMultipartForm(100 << 20); err != nil {
+		http.Error(w, fmt.Sprintf("解析表单失败: %v", err), http.StatusBadRequest)
+		return
+	}
+
+	files := r.MultipartForm.File["file"]
+	if len(files) == 0 {
+		http.Error(w, "没有选择文件", http.StatusBadRequest)
+		return
+	}
+
+	uploaded := 0
+	for _, fileHeader := range files {
+		file, err := fileHeader.Open()
+		if err != nil {
+			http.Error(w, fmt.Sprintf("打开文件失败: %v", err), http.StatusInternalServerError)
+			return
+		}
+		defer file.Close()
+
+		// Sanitize filename
+		filename := filepath.Base(fileHeader.Filename)
+		destPath := filepath.Join(dir, filename)
+
+		// Check if file exists
+		if _, err := os.Stat(destPath); err == nil {
+			// Add suffix to avoid overwrite
+			ext := filepath.Ext(filename)
+			base := strings.TrimSuffix(filename, ext)
+			for i := 1; ; i++ {
+				newName := fmt.Sprintf("%s_%d%s", base, i, ext)
+				destPath = filepath.Join(dir, newName)
+				if _, err := os.Stat(destPath); os.IsNotExist(err) {
+					break
+				}
+			}
+		}
+
+		dest, err := os.Create(destPath)
+		if err != nil {
+			http.Error(w, fmt.Sprintf("创建文件失败: %v", err), http.StatusInternalServerError)
+			return
+		}
+
+		if _, err := io.Copy(dest, file); err != nil {
+			dest.Close()
+			http.Error(w, fmt.Sprintf("写入文件失败: %v", err), http.StatusInternalServerError)
+			return
+		}
+		dest.Close()
+
+		fmt.Fprintf(req.Stdout, "[上传] %s -> %s\n", fileHeader.Filename, destPath)
+		uploaded++
+	}
+
+	// Set content type based on Accept header
+	accept := r.Header.Get("Accept")
+	if strings.Contains(accept, "application/json") {
+		w.Header().Set("Content-Type", "application/json")
+		fmt.Fprintf(w, `{"success": true, "uploaded": %d}`, uploaded)
+	} else {
+		w.Header().Set("Content-Type", "text/html; charset=utf-8")
+		fmt.Fprintf(w, "<html><body><h2>上传成功</h2><p>已上传 %d 个文件</p><a href='/'>返回</a></body></html>", uploaded)
+	}
+}
+
+// detectContentType tries to detect the MIME type of a file
+func detectContentType(path string) string {
+	ext := filepath.Ext(path)
+	if ext == "" {
+		return "application/octet-stream"
+	}
+
+	mimeType := mime.TypeByExtension(ext)
+	if mimeType != "" {
+		return mimeType
+	}
+
+	return "application/octet-stream"
+}