Laravel如何实现文件的上传、存储和下载

'public' => [
    'driver' => 'local',
    'root' => storage_path('app/public'),
    'url' => env('APP_URL').'/storage',
    'visibility' => 'public',
],

php artisan storage:link

<form method="POST" action="/upload" enctype="multipart/form-data">
    @csrf
    <input type="file" name="file">
    <button type="submit">上传</button>
</form>

use Illuminate\Http\Request;
use Illuminate\Support\Facades\Storage;

public function upload(Request $request)
{
    $request->validate([
        'file' => 'required|file|max:2048', // 最大 2MB
    ]);

    if ($request->hasFile('file') && $request->file('file')->isValid()) {
        
        // 存储到 public 磁盘，并生成唯一文件名
        $path = $request->file('file')->store('uploads', 'public');

        // 获取可访问的 URL
        $url = Storage::url($path);

        return response()->json([
            'message' => '上传成功',
            'path' => $path,
            'url' => $url
        ]);
    }

    return response()->json(['error' => '上传失败'], 400);
}

public function download($filename)
{
    $path = 'uploads/' . $filename;

    if (Storage::disk('public')->exists($path)) {
        return Storage::disk('public')->download($path, '自定义名称.pdf');
    }

    return abort(404);
}

return response()->file(Storage::disk('public')->path($path));

if ($user->canAccessFile($filename)) {
    return Storage::disk('private')->download($path);
}