由于Dcat admin暂不支持 maatwebsite/excel3.1 对原本的导出组件进行自定义，因此使用$grid->tool()自定义按钮做导出。

Dcat admin使用maatwebsite/excel2.1进行自定义导出文档：数据导出《Dcat Admin 中文文档》

1、使用maatwebsite/excel3.1完成导出接口，用于 TestExport 工具类

<?php
namespace App\Admin\Controllers;

use App\Admin\Extensions\TestExpoter;
use App\Http\Controllers\Controller;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Storage;
use Maatwebsite\Excel\Facades\Excel;

class TestController extends Controller
{
    /**
     * 导出
     *
     * @param Request $request
     * @return \Symfony\Component\HttpFoundation\BinaryFileResponse
     */ 
    public function export(Request $request)
    {
        $filename = $request->get('filename');

        $param = json_decode($request->get('param'));

        ob_end_clean();
        return Excel::download(new TestExpoter($param),$filename . '.xlsx');
    }
}

2、TestExpoter 类返回导出数据

<?php

namespace App\Admin\Extensions;


use Illuminate\Support\Facades\DB;
use Maatwebsite\Excel\Concerns\FromCollection;
use Maatwebsite\Excel\Concerns\WithHeadings;

class TestExpoter implements FromCollection,WithHeadings
{
    private $row;
    private $data;
    private $headings;

    /**
     * TaskDataExcelExpoter constructor.
     * @param array $param 筛选条件
     * @param array $data 数据
     * @param array $headings 表头
     */ 
    public function __construct($param = [], $data = [], $headings = [])
    {
        //表头设定 
        $headings = [[
            'id' => 'ID',
            ...
        ]];
        $data = $this->getData($param);

        $this->headings = $headings;
        $this->data = $data;
    }

    public function headings(): array
    {
        return $this->headings;
    }

    public function collection()
    {
        return collect($this->data);
    }

    /**
     * 获取导出数据
     *
     * @param $param
     * @return mixed
     */ 
    private function getData($param)
    {
        $param = json_decode(json_encode($param), true);

        $note_monitor = DB::table('table_name')->get()->toArray();
        $list = ['处理后的数据'];
        return $list;

    }
}

3、定义路由

Route::get('/export', 'TestController@export');

4、创建 TestExport 类继承 Dcat\Admin\Grid\Tools\AbstractTool 类

<?php

namespace App\Admin\Actions\Grid;

use Dcat\Admin\Grid\Tools\AbstractTool;
use Illuminate\Http\Request;

class TestExport extends AbstractTool
{
    /**
     * @return string
     */ 
    protected $title = '导出当前页';

    protected $request_param = [];

    protected $request_filename = '';

    /**
     * 接收参数
     */ 
    public function __construct($param = null, $filename = null, $title)
    {
        $this->request_param = $param;
        $this->request_filename = $filename;
        parent::__construct($title);

        $this->title = $title;
    }

    /**
     * 按钮样式定义，默认 btn btn-white waves-effect
     *
     * @var string
     */ 
    protected $style = 'btn btn-outline-info';

    /**
     * 按钮文本
     *
     * @return string|void
     */ 
    public function title()
    {
        return $this->title;
    }

    /**
     * 处理请求
     * 如果你的类中包含了此方法，则点击按钮后会自动向后端发起ajax请求，并且会通过此方法处理请求逻辑
     *
     * @param Request $request
     */ 
    public function handle(Request $request)
    {
        $param = $request->get('param');
        $filename = $request->get('filename');

        // 调用/export接口进行导出 
        return $this->response()->download('/export?filename=' . $filename . '&param=' . json_encode($param) . '&_export_=1');
    }

    /**
     * 设置请求参数
     *
     * @return array|void
     */ 
    public function parameters()
    {
        return [
            'param' => $this->request_param,
            'filename' => $this->request_filename,
            'title' => $this->title,
        ];
    }

}

5、使用TestRepository 类展示列表

<?php

namespace App\Admin\Controllers;

use App\Admin\Repositories\TestRepository;
use Dcat\Admin\Grid;
use \Dcat\Admin\Http\Controllers\AdminController;

class TestController extends AdminController
{
    protected function grid()
    {
        return Grid::make(new TestRepository(), function (Grid $grid) {
            // 第一列显示id字段，并将这一列设置为可排序列 
            $grid->column('id', 'ID')->sortable();
            ...

            // 自定义工具 
            $grid->tools(function (Grid\Tools $tools) use ($grid){
                // 获取当前页数
                $currentPage = $grid->model()->getCurrentPage();
                // 获取每页显示行数 
                $perPage = $grid->model()->getPerPage();

                $start = ($currentPage - 1) * $perPage;

                // 获取排序参数 
                $sort = $grid->model()->getSort();

                // 获取筛选条件 
                $id = $grid->filter()->input('id'),

                // 获取规格选择器条件 
                $gender = $grid->filter()->input('_selector.gender'),

                $param = [
                    'sort'     => $sort,
                    'search'   => ['id' => $id],
                    'selector' => ['gender' => $gender]
                ];

                // 导出 
                $tools->append(new TestExport($param, $this->title, '导出当前页'));

            });
            // 筛选 
            $grid->filter(function ($filter) {
                // 设置id字段的范围查询 
                $filter->equal('id', 'ID');
                ...
            });
            // 规格选择器 
            $grid->selector(function (Grid\Tools\Selector $selector) {
                //性别 
                $selector->select('gender', '性别', [0 => '男', 1 => '女', '' => '未标明']);

            });
        });
    }
}

博文转载：blog.csdn.net/weixin_43870916/arti...