laravel框架使用FormRequest进行表单验证，验证异常返回JSON操作示例

php artisan make:request TestRequest

<?php
namespace App\Http\Requests;
use Illuminate\Foundation\Http\FormRequest;
use Illuminate\Contracts\Validation\Validator;
use Illuminate\Http\Exceptions\HttpResponseException;
class TestRequest extends FormRequest
{
  /**
   * 控制访问权限
   */
  public function authorize()
  {
    //注意，默认是false，改成true
    return true;
  }
  /**
   * 验证规则
   */
  public function rules()
  {
    return [
      'name' => 'required',
      'pwd' => 'required',
    ];
  }
  /**
   * 验证消息
   */
  public function messages()
  {
    return [
      'name.required' => '姓名必填',
      'pwd.required' => '密码必填',
    ];
  }
}

public function failedValidation(Validator $validator)
{
  throw (new HttpResponseException(response()->json([
    'status_code' => 500,
    'message' => '请求错误',
    'data' => $validator->errors()->first(),
  ], 200)));
}