由于在lumen中使用本地存储需要创建软连将storage目录链接到public目录下，但是执行 php artisan storage:link 发现没有这个命令，所以我们参考laravel，将对应命令移植到录么lumen中来

在app/Console/Commands/下新建文件StorageLinkCommand.php

<?php

namespace App\Console\Commands;

use Illuminate\Console\Command;

class StorageLinkCommand extends Command
{
    /**
     * The console command signature.
     *
     * @var string
     */
    protected $signature = 'storage:link
                {--relative : Create the symbolic link using relative paths}
                {--force : Recreate existing symbolic links}';

    /**
     * The console command description.
     *
     * @var string
     */
    protected $description = 'Create the symbolic links configured for the application';

    /**
     * Execute the console command.
     *
     * @return void
     */
    public function handle()
    {
        $relative = $this->option('relative');

        foreach ($this->links() as $link => $target) {
            if (file_exists($link) && ! $this->isRemovableSymlink($link, $this->option('force'))) {
                $this->error("The [$link] link already exists.");
                continue;
            }

            if (is_link($link)) {
                $this->laravel->make('files')->delete($link);
            }

            if ($relative) {
                $this->laravel->make('files')->relativeLink($target, $link);
            } else {
                $this->laravel->make('files')->link($target, $link);
            }

            $this->info("The [$link] link has been connected to [$target].");
        }

        $this->info('The links have been created.');
    }

    /**
     * Get the symbolic links that are configured for the application.
     *
     * @return array
     */
    protected function links()
    {
        return $this->laravel['config']['filesystems.links'] ??
               [public_path('storage') => storage_path('app/public')];
    }

    /**
     * Determine if the provided path is a symlink that can be removed.
     *
     * @param  string  $link
     * @param  bool  $force
     * @return bool
     */
    protected function isRemovableSymlink(string $link, bool $force): bool
    {
        return is_link($link) && $force;
    }
}

上述命令代码是从laravel框架中复制过来，但是由于lumen没有public_path方法，所以我在自己的项目中引入了helpers.php来存放一些公用方法，如下

if (!function_exists('public_path')) {
    /**
     * Get the path to the public folder.
     *
     * @param string $path
     * @return string
     */
    function public_path($path = '')
    {
        return rtrim(app()->basePath('public/' . $path), '/');
    }
}

然后在 app/Console/Kernel.php中引入命令，如下

<?php

namespace App\Console;

use Illuminate\Console\Scheduling\Schedule;
use Laravel\Lumen\Console\Kernel as ConsoleKernel;
use App\Console\Commands\StorageLinkCommand;

class Kernel extends ConsoleKernel
{
    /**
     * The Artisan commands provided by your application.
     *
     * @var array
     */
    protected $commands = [
        StorageLinkCommand::class,
    ];

    /**
     * Define the application's command schedule.
     *
     * @param  \Illuminate\Console\Scheduling\Schedule  $schedule
     * @return void
     */
    protected function schedule(Schedule $schedule)
    {
        //
    }
}

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