基于Container Event容器事件的Laravel WEB APP

WBOY
Release: 2016-06-23 13:07:44
Original
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说明:本文主要讲述Laravel容器事件,并更根据容器事件做一个简单demo供加深理解容器事件。同时,作者会将开发过程中的一些截图和代码黏上去,提高阅读效率。

Container是Laravel框架的核心,Container中储存着各种各样的Service,并且每一个Service通过Service Provider注册在Container里,通过Facade模式帮我们从容器里去解析需要的Service对象。而这个过程中,容器每一次从容器中解析对象时是会触发一个事件的,可以通过 resolving 方法监听到。实际上在Laravel框架中表单请求验证就用到这个好工具,通过一个表单请求类来实现表单内容验证,以免把逻辑放在控制器里弄乱控制器,具体可以看中文文档: 表单请求验证 。关于Container Event可以看文档: 容器事件 。

Container Event在表单请求中的应用

先写路由:

Route::post('containerevent', 'ContainerEventController@containerEvent');Route::post('formrequest', 'ContainerEventController@formRequest');Route::get('container', 'ContainerEventController@profile');
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再建个控制器:

php artisan make:controller ContainerEventController
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写上方法:

    public function containerEvent()    {                }    public function formRequest()    {    }    public function profile()    {        return view('profile');    }
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写上view:

<html lang="en">    <head>        <meta charset="utf-8">        <meta http-equiv="X-UA-Compatible" content="IE=edge">        <meta name="viewport" content="width=device-width, initial-scale=1">        <!-- 上述3个meta标签*必须*放在最前面,任何其他内容都*必须*跟随其后! -->        <title>Bootstrap Template</title>        <!-- 新 Bootstrap 核心 CSS 文件 -->        <link rel="stylesheet" href="//cdn.bootcss.com/bootstrap/3.3.5/css/bootstrap.min.css">        <style>            html,body{                width: 100%;                height: 100%;            }            *{                margin: 0;                border: 0;            }        </style>    </head>    <body>        <div class="container">            <div class="row">                <div class="col-xs-12 col-md-12">                    <form action="/formrequest" method="post" accept-charset="UTF-8" enctype="multipart/form-data">                        <div class="form-group">                            <label for="name">Name</label>                            <input type="text" class="form-control" id="name" name="name" placeholder="Name">                        </div>                        <div class="form-group">                            <label for="age">Age</label>                            <input type="text" class="form-control" id="age" name="age" placeholder="Age">                        </div>                        <button type="submit" class="btn btn-default">Submit</button>                    </form>                </div>            </div>        </div>        <!-- jQuery文件。务必在bootstrap.min.js 之前引入 -->        <script src="//cdn.bootcss.com/jquery/1.11.3/jquery.min.js"></script>        <!-- 最新的 Bootstrap 核心 JavaScript 文件 -->        <script src="//cdn.bootcss.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>        <script>        </script>    </body></html>
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写个表单请求类:先输入命令生成表单请求类

php artisan make:request ContainerFormRequest
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再给出验证规则

class ContainerFormRequest extends Request{    /**     * Determine if the user is authorized to make this request.     *     * @return bool     */    public function authorize()    {        return true;//改为true,这里一般用作用户验证,这里全部通过验证    }    /**     * Get the validation rules that apply to the request.     *     * @return array     */    public function rules()    {        return [            'name' => 'required',            'age'  => 'required|numeric|min:18',        ];    }}
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修改ContainerEventController:

public function formRequest(ContainerFormRequest $containerFormRequest){        dd('This is a From Request Container Event. It is working!!!');}
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同时把app/Http/Kernel.php文件中\App\Http\Middleware\VerifyCsrfToken::class注销掉,否则提交表单TokenMismatchException错误。

好,输入路由(修改为你的路由): http://laravelcontainerevent.app:8888/container ,则输入错误表单会返回到当前表单页面,正确提交输入表单后会打印:

说明fromRequest已经工作了,ContainerFormRequest这个对象从容器中解析的时候,会先工作 authorize 和 rules 方法。而控制器中只需要注入ContainerFormRequest这个对象就行了。

Demo

实现一个自定义的类,实现表单提交相同的功能。在app/Contracts文件夹中新建EventBeforeResolving.php文件:

namespace App\Contracts;interface EventBeforeResolving{    public function isAdult();}
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并在一个service provider注册下:

//AppServiceProvider.php/**     * Register any application services.     *     * @return void     */    public function register()    { //当从容器中解析注入到控制器中前,会先调用实现EventBeforeResolving接口对象的isAdult()方法        $this->app->resolving(EventBeforeResolving::class,function($obj, $app){            $obj->isAdult();        });    }
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写一个service实现这个接口:

//app/Services/Authorize.phpnamespace App\Services;use App\Contracts\EventBeforeResolving;use Illuminate\Http\Request;class Authorize implements EventBeforeResolving{    private $request;    public function __construct(Request $request)    {        $this->request = $request;    }    public function isAdult()    {        $name = $this->request->input('name');        $age = $this->request->input('age');        if(empty($name) || empty($age) || ($age < 18)){            dd('Name and Age must be required. And Age must be above 18');        }    }}
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修改下ContainerEventController:

    public function containerEvent(Authorize $authorize)    {        dd('This is a Demo Container Event. It is working!!!');    }
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同时别忘了修改下profile.blade.php文件中表单提交action='/containerevent'。

当输入错误时会提示错误信息:

Container Event就是在Service对象从容器中解析注入前触发事件,可以利用这个功能做一些有趣又好用的好东西呢,比如Laravel框架的表单请求验证就是这么做的,这样不会把验证逻辑代码放在控制器中,以免弄乱控制器。

总结:本节主要讲述Laravel的容器事件,并以Form Requet为例说明它的用途,同时以一个小demo讲述怎么一步步建立并监听容器事件。嘛,过两天还想结合Laravel的Task Schedual任务调度新开篇章,到时见。

source:php.cn
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