course-site/app/Exports/School/StudentExport.php

<?php

namespace App\Exports\School;

use App\Repositories\Enums\ModelStatusEnum;
use App\Repositories\Models\School\Student;
use Maatwebsite\Excel\Concerns\Exportable;
use Maatwebsite\Excel\Concerns\FromQuery;
use Maatwebsite\Excel\Concerns\ShouldAutoSize;
use Maatwebsite\Excel\Concerns\WithColumnWidths;
use Maatwebsite\Excel\Concerns\WithHeadings;
use Maatwebsite\Excel\Concerns\WithMapping;
use Maatwebsite\Excel\Concerns\WithStyles;
use PhpOffice\PhpSpreadsheet\Style\Alignment;
use PhpOffice\PhpSpreadsheet\Worksheet\Worksheet;


class StudentExport implements FromQuery, WithMapping, WithHeadings, ShouldAutoSize, WithColumnWidths, WithStyles
{
    use Exportable;

    const BaseFields = [
        [
            'name' => '序号',
            'width' => 8,
        ],
        [
            'name' => '学号',
            'width' => 15,
            'field' => 'account'
        ],
        [
            'name' => '姓名',
            'width' => 20,
            'field' => 'name'
        ],
        [
            'name' => '性别',
            'width' => 10,
        ],
        [
            'name' => '班级',
            'width' => 20,
        ],
        [
            'name' => '手机号',
            'width' => 20,
            'field' => 'mobile'
        ],
        [
            'name' => '邮箱',
            'width' => 20,
            'field' => 'email'
        ],
        [
            'name' => '状态',
            'width' => 10,
        ],
    ];
    protected $rowNums = 0;
    protected $ids = [];
    protected $lastC = 'A';
    protected $fields = [];

    public function __construct($ids, $field_ids = [])
    {
        $this->ids = $ids;
        $fields = [];
        if (!is_array($field_ids) || !count($field_ids)) {
            $fields = self::BaseFields;
        } else {
            foreach ($field_ids as $field_id) {
                $fields[] = self::BaseFields[$field_id];
            }
        }
        $this->fields = $fields;
    }

    public function query()
    {
        $ids = $this->ids;
        $model = Student::query();
        if (!count($ids)) return $model->where('id', 0);
        return $model
            ->with(['grade'])
            ->whereIn('id', $ids)->orderByDesc('id');
    }

    public function map($row): array
    {
        $row = $row->toArray();
        $this->rowNums++;
        $data = [];
        foreach ($this->fields as $k => $col) {
            $name = $col['name'];
            if ($name == '序号') $data[$k] = $this->rowNums;

            if (isset($col['field'])) {
                $data[$k] = $row[$col['field']];
                continue;
            }

            if ($name == '性别') {
                $sex_name = '';
                switch ((int)$row['sex']) {
                    case 1:
                        $sex_name = '男';
                        break;
                    case 2:
                        $sex_name = '女';
                        break;
                }
                $data[$k] = $sex_name;
                continue;
            }

            if ($name == '班级') {
                $data[$k] = getVal($row['grade']['name']);
                continue;
            }

            if ($name == '状态') {
                $data[$k] = ModelStatusEnum::getDescription($row['status']);
                continue;
            }
        }

        return $data;
    }


    public function headings(): array
    {
        $room_name = '学生数据';
        $data[] = [$room_name];

        $data[] = array_column($this->fields, 'name');
        return $data;
    }

    public function headingRow(): int
    {
        return 2;
    }

    public function columnWidths(): array
    {
        $i = 65;
        $data = [];
        foreach ($this->fields as $k => $field) {
            $s = intval($k / 26);

            if (!$s) $key = chr($i + $k);
            if ($s > 0) {
                $y = intval($k % 26);
                $key = chr($s + $i - 1);
                $key .= chr($y + $i);
            }
            $data["{$key}"] = $field['width'];
            $this->lastC = $key;
        }
        return $data;
    }

    public function styles(Worksheet $sheet)
    {
        $last = $this->lastC;
        $cellRange = "A1:{$last}1";
        $sheet->getStyle($cellRange)->getFont()->setSize(12);

        $sheet->getDefaultRowDimension()->setRowHeight(40);//设置行高

        // 文字居中
        $lastrow = $sheet->getHighestRow();
        $sheet->getStyle("A1:{$last}" . $lastrow)->getAlignment()->setVertical(Alignment::VERTICAL_CENTER);//垂直居中
        $sheet->getStyle("A1:{$last}" . $lastrow)->getAlignment()->setHorizontal(Alignment::HORIZONTAL_CENTER);
        $sheet->getStyle("A1:{$last}" . $lastrow)->getAlignment()->setWrapText(true);

        $sheet->mergeCells("A1:{$last}1"); //合并
        $sheet->getStyle("A1:{$last}1")->getFont()->setSize(16);
    }


}