我需要建议使用这种方法来编程接口。
方案:
我需要实现一个虚拟类ImageUploader
然后在构造函数上接收一个接口并将图像保存在我的目录中。这是出于学习目的,所以如果我以正确的方式做到这一点,我需要你的建议:
这是我在Laravel 5.3框架上的实现:
1:实现的虚拟接口,因此我可以创建不同的方式来存储我的图像
//dummy interface
namespace App\Lib\ImageUploader\Drivers;
interface ImageInterface
{
public function hello();
}
2:这里有两个实现我的界面的驱动程序。每一个都是自己的方法hello
(在现实生活中,例如每个类可以为任何类型的驱动程序都有自己的保存方法)
// Avatar Driver Class
namespace App\Lib\ImageUploader\Drivers;
class AvatarImage implements ImageInterface
{
public function hello()
{
return 'I am a AvatarImage';
}
}
另一个类,例如BackgroundImage
可以保存用户上传图片的桌面和移动版本:
// Background Driver Class
namespace App\Lib\ImageUploader\Drivers;
class BackgroundImage implements ImageInterface
{
public function hello()
{
// this is a dummy method, in real life this class will save 2 images (desktop + mobile)
return 'I am a BackgroundImage';
}
}
这是我的ImageUploader
课程"编程接口"策略:
// ImageUploader.php
// this class will implement all methods that I need for manage saving operations
namespace App\Lib\ImageUploader;
use App\Lib\ImageUploader\Drivers\ImageInterface;
class ImageUploader
{
protected $driver;
public function __construct(ImageInterface $driver)
{
$this->driver = $driver;
}
public function save()
{
return $this->driver->hello();
}
}
现在我创建自己的Laravel框架服务提供程序:
namespace App\Providers;
use App\Lib\ImageUploader\Drivers\AvatarImage;
use App\Lib\ImageUploader\Drivers\BackgroundImage;
use App\Lib\ImageUploader\ImageUploader;
use Illuminate\Support\ServiceProvider;
class ImageUploadServiceProvider extends ServiceProvider
{
/**
* Bootstrap the application services.
*
* @return void
*/
public function boot()
{
//
}
/**
* Register the application services.
*
* @return void
*/
public function register()
{
$this->registerAvatar();
$this->registerBackground();
}
protected function registerAvatar(){
$this->app->bind('AvatarUploader', function () {
return new ImageUploader(new AvatarImage());
});
}
protected function registerBackground(){
$this->app->bind('BackgroundUploader', function () {
return new ImageUploader(new BackgroundImage());
});
}
}
最后,我尝试在我的控制器中使用我的课程,例如当用户尝试上传您的头像图片或新的背景图片时:
// this will produce "I am a AvatarImage" in real life this line create thumbnail and will save my image in my local directory
public function store(Request $request){
(App::make('AvatarUploader'))->save();
}
有更好的方法吗?关于我的实施的任何建议?
答案 0 :(得分:1)
查看https://laravel.com/docs/5.3/container#binding-interfaces-to-implementations和https://laravel.com/docs/5.3/container#contextual-binding。
因此,在您的服务提供商逻辑中,您可以指定 -
ImageInterface
然后在你的控制器或其他类中,只依赖注入class AvatarController extends Controller
{
protected $imageInterface;
public function __construct(ImageInterface $imageInterface)
{
$this->imageInterface = $imageInterface;
}
public function store()
{
return $this->imageInterface->hello(); // returns "I am an Avatar Image"
}
}
class BackgroundController extends Controller
{
protected $imageInterface;
public function __construct(ImageInterface $imageInterface)
{
$this->imageInterface = $imageInterface;
}
public function store()
{
return $this->imageInterface->hello(); // returns "I am a Background Image"
}
}
接口而不是具体的类。
class MiDragListener implements OnDragListener
{
@Override
public boolean onDrag(View v, DragEvent event)
{
int accion = event.getAction();
switch (accion)
{
case DragEvent.ACTION_DRAG_STARTED:
case DragEvent.ACTION_DRAG_EXITED:
v.setScaleX((float)1.0);
v.setScaleY((float)1.0);
break;
case DragEvent.ACTION_DRAG_ENTERED:
v.setScaleX((float)2.0);
v.setScaleY((float)2.0);
break;
case DragEvent.ACTION_DRAG_ENDED:
v.setScaleX((float)1.0);
v.setScaleY((float)1.0);
break;
case DragEvent.ACTION_DROP:
break;
default:
break;
}
return true;
}
} // end MiDragListener