在Laravel 5.3中创建自定义异常类和自定义处理程序类 [英] Creating a custom exception class and custom handler class in Laravel 5.3
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问题描述
我有以下...
App \Exceptions\CustomException.php
<？php
命名空间App \Exceptions;
使用异常;
class CustomException extends Exception
{
public function __construct（）
{
parent :: __ construct（）;
}
}
App \Exceptions\CustomHandler.php
<？php
命名空间App \Exceptions;
使用异常;
使用App \Exceptions\Handler作为ExceptionHandler;
使用Illuminate\Contracts\Container\Container;
使用App \Project\Frontend\Repo\Vehicle\EloquentVehicle;
使用Illuminate\Foundation\Exceptions\Handler;
使用Illuminate\Support\Facades\View;
class CustomHandler extends ExceptionHandler
{
protected $ vehicle;
public function __construct（Container $ container，EloquentVehicle $ vehicle）
{
parent :: __ construct（$ container）;
$ this->车辆= $车辆;
}
/ **
*报告或记录异常。
*
*这是向Sentry，Bugsnag等发送异常的好地方。
*
* @param \Exception $ exception
* @return void
* /
public function report（Exception $ exception）
{
parent :: report（$ exception）;
}
/ **
*向HTTP响应中呈现异常。
*
* @param \Illuminate\Http\Request $ request
* @param \Exception $ exception
* @return \Illuminate\Http\响应
* /
public function render（$ request，Exception $ exception）
{
$ exception = Handler :: prepareException（$ exception）;
if（$ exception instanceof CustomException）{
return $ this-> showCustomErrorPage（）;
}
return parent :: render（$ request，$ exception）;
}
public function showCustomErrorPage（）
{
$ recentAdded = $ this-> vehicle-> fetchLatestVehicles（0，12）;
return View :: make（'errors.404Custom'） - > with（'recentAdded'，$ recentAdded）;
}
}
为了测试这个我添加了
将新的CustomException（）;
给我的控制器，但它不提出404自定义视图。我需要做些什么才能使这项工作有效？
更新如果您尝试使用以下方式访问课程中的函数，则会得到BindingResolutionException：
应用程序（MyClass :: class） - > functionNameGoesHere （）;
要简单地创建一个变量，就像将你的类绑定到服务提供者的容器一样。
我的代码如下所示：
protected function showCustomErrorPage（）
{
$ eloquentVehicle = new EloquentVehicle（new Vehicle（），new Dealer（））;
$ recentAdded = $ eloquentVehicle-> fetchLatestVehicles（0，12）;
return view（） - > make（'errors.404Custom'） - > with（'recentAdded'，$ recentAdded）;
}
Amit的版本
protected function showCustomErrorPage（）
{
$ recentAdded = app（EloquentVehicle :: class） - > fetchLatestVehicles（0，12）;
return view（） - > make（'errors.404Custom'） - > with（'recentAdded'，$ recentAdded）;
}
解决方案
Laravel调用 render 函数 App \Exceptions\Handler class。所以重写它将不起作用。
你必须将它添加到 App \Exceptions\Handler
例如：
<？php
命名空间App \Exceptions;
使用异常;
使用Illuminate\Auth\AuthenticationException;
使用App \Project\Frontend\Repo\Vehicle\EloquentVehicle;
使用Illuminate\Foundation\Exceptions\Handler作为ExceptionHandler;
class Handler extends ExceptionHandler
{
/ **
*不应该报告的异常类型的列表。
*
* @var数组
* /
protected $ dontReport = [
\Illuminate\Auth\AuthenticationException :: class，
\\ \\Illuminate\Auth\Access\AuthorizationException :: class，
\Symfony\Component\HttpKernel\Exception\HttpException :: class，
\Illuminate\Database\ Eloquent\ModelNotFoundException :: class，
\Illuminate\Session\TokenMismatchException :: class，
\Illuminate\Validation\ValidationException :: class，
];
/ **
*报告或记录一个例外。
*
*这是向Sentry，Bugsnag等发送异常的好地方。
*
* @param \Exception $ exception
* @return void
* /
public function report（Exception $ exception）
{
parent :: report（$ exception）;
}
/ **
*向HTTP响应中呈现异常。
*
* @param \Illuminate\Http\Request $ request
* @param \Exception $ exception
* @return \Illuminate\Http\响应
* /
public function render（$ request，Exception $ exception）
{
if（$ exception instanceof CustomException）{
return $ this-> showCustomErrorPage （）;
}
return parent :: render（$ request，$ exception）;
}
protected function showCustomErrorPage（）
{
$ recentAdded = app（EloquentVehicle :: class） - > fetchLatestVehicles（0，12）;
return view（） - > make（'errors.404Custom'） - > with（'recentAdded'，$ recentAdded）;
}
}
Before I get to the code, let me explain my aim. My web app displays vehicles for sale. I have a need for a custom 404 page that will display 12 of the latest vehicles added to the database if the user tries to access a page that doesn't exist.
I have the following...
App\Exceptions\CustomException.php
<?php
namespace App\Exceptions;
use Exception;
class CustomException extends Exception
{
public function __construct()
{
parent::__construct();
}
}
App\Exceptions\CustomHandler.php
<?php
namespace App\Exceptions;
use Exception;
use App\Exceptions\Handler as ExceptionHandler;
use Illuminate\Contracts\Container\Container;
use App\Project\Frontend\Repo\Vehicle\EloquentVehicle;
use Illuminate\Foundation\Exceptions\Handler;
use Illuminate\Support\Facades\View;
class CustomHandler extends ExceptionHandler
{
protected $vehicle;
public function __construct(Container $container, EloquentVehicle $vehicle)
{
parent::__construct($container);
$this->vehicle = $vehicle;
}
/**
* Report or log an exception.
*
* This is a great spot to send exceptions to Sentry, Bugsnag, etc.
*
* @param \Exception $exception
* @return void
*/
public function report(Exception $exception)
{
parent::report($exception);
}
/**
* Render an exception into an HTTP response.
*
* @param \Illuminate\Http\Request $request
* @param \Exception $exception
* @return \Illuminate\Http\Response
*/
public function render($request, Exception $exception)
{
$exception = Handler::prepareException($exception);
if($exception instanceof CustomException) {
return $this->showCustomErrorPage();
}
return parent::render($request, $exception);
}
public function showCustomErrorPage()
{
$recentlyAdded = $this->vehicle->fetchLatestVehicles(0, 12);
return View::make('errors.404Custom')->with('recentlyAdded', $recentlyAdded);
}
}
To test this I added
throw new CustomException();
to my controller but it doesn't bring up the 404Custom view. What do I need to do to get this working?
UPDATE: Just a note for anyone who's bound their class to their model. You'll get a BindingResolutionException if you try to access a function in your class using:
app(MyClass::class)->functionNameGoesHere();
To get around this simply create a variable in the same way you would bind your class to the Container in your service provider.
My code looks like this:
protected function showCustomErrorPage()
{
$eloquentVehicle = new EloquentVehicle(new Vehicle(), new Dealer());
$recentlyAdded = $eloquentVehicle->fetchLatestVehicles(0, 12);
return view()->make('errors.404Custom')->with('recentlyAdded', $recentlyAdded);
}
Amit's version
protected function showCustomErrorPage()
{
$recentlyAdded = app(EloquentVehicle::class)->fetchLatestVehicles(0, 12);
return view()->make('errors.404Custom')->with('recentlyAdded', $recentlyAdded);
}
解决方案
Laravel calls the render function of App\Exceptions\Handler class. So overriding it will not work.
You have to add it in App\Exceptions\Handler class only.
For example:
<?php
namespace App\Exceptions;
use Exception;
use Illuminate\Auth\AuthenticationException;
use App\Project\Frontend\Repo\Vehicle\EloquentVehicle;
use Illuminate\Foundation\Exceptions\Handler as ExceptionHandler;
class Handler extends ExceptionHandler
{
/**
* A list of the exception types that should not be reported.
*
* @var array
*/
protected $dontReport = [
\Illuminate\Auth\AuthenticationException::class,
\Illuminate\Auth\Access\AuthorizationException::class,
\Symfony\Component\HttpKernel\Exception\HttpException::class,
\Illuminate\Database\Eloquent\ModelNotFoundException::class,
\Illuminate\Session\TokenMismatchException::class,
\Illuminate\Validation\ValidationException::class,
];
/**
* Report or log an exception.
*
* This is a great spot to send exceptions to Sentry, Bugsnag, etc.
*
* @param \Exception $exception
* @return void
*/
public function report(Exception $exception)
{
parent::report($exception);
}
/**
* Render an exception into an HTTP response.
*
* @param \Illuminate\Http\Request $request
* @param \Exception $exception
* @return \Illuminate\Http\Response
*/
public function render($request, Exception $exception)
{
if($exception instanceof CustomException) {
return $this->showCustomErrorPage();
}
return parent::render($request, $exception);
}
protected function showCustomErrorPage()
{
$recentlyAdded = app(EloquentVehicle::class)->fetchLatestVehicles(0, 12);
return view()->make('errors.404Custom')->with('recentlyAdded', $recentlyAdded);
}
}
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