今天使用Lumen的时候，用到了Response类，很奇怪提示：Target [Illuminate\Contracts\Routing\ResponseFactory] is not instantiable.大概就是说实例不了Response 类，那怎么解决呢？我们以一个全新的Lumen项目来说

1.我在web.php写了个路由

<?php/*|--------------------------------------------------------------------------| Application Routes|--------------------------------------------------------------------------|| Here is where you can register all of the routes for an application.| It is a breeze. Simply tell Lumen the URIs it should respond to| and give it the Closure to call when that URI is requested.|*/use Illuminate\Support\Facades\Response;$router->get('/', function () use ($router) {    return Response::json('123456',200);});

然后访问这个路由报错如下（也就是我们要解决的错误）：

2.解决办法

2.1 打开项目根目录下的 bootstrap/app.php

//找到这两行把注释去掉 $app->withFacades();   $app->register(App\Providers\AppServiceProvider::class);

2.2 找到 项目根目录下的 app/Providers/AppServiceProvider.php

<?phpnamespace App\Providers;use Illuminate\Routing\ResponseFactory;use Illuminate\Support\ServiceProvider;class AppServiceProvider extends ServiceProvider{    /**     * Register any application services.     *     * @return void     */    public function register()    {    }}

在 register 注册 ResponseFactory 修改如下：

<?phpnamespace App\Providers;use Illuminate\Routing\ResponseFactory;use Illuminate\Support\ServiceProvider;class AppServiceProvider extends ServiceProvider{    /**     * Register any application services.     *     * @return void     */    public function register()    {        $this->app->singleton('Illuminate\Contracts\Routing\ResponseFactory', function ($app)        {            return new ResponseFactory(            $app['Illuminate\Contracts\View\Factory'],             $app['Illuminate\Routing\Redirector']);        });    }}

这时候还不行, 我们还需要安装一个 库,切换到项目根目录 执行composer命令：

composer require "illuminate/routing"

库安装完后，我们访问试试：

很简单吧，这样就可以啦~~

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