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在代码app/api/behavior/tags.php里面添加

    'upload_after' => [
        'app\\api\\behavior\\UploadAfter',//可填写自己命名的文件
    ],
    

return [

    'upload_after' => [
        'app\\api\\behavior\\UploadAfter',
    ],
    
];

在代码创建代码在目录模块 app/api/behavior/

文件名UploadAfter.php (要和tags里面的对应哦)

<?php

namespace app\api\behavior;

use think\image\Exception as ImageException;

class UploadAfter
{
    public function run(&$params)
    {
        if (request()->action() == 'upload_water_image' || request()->post('type') == 'image_water') { //更具自己的方法或者参数来判断是否要加入水印 这里方法和post参数type 为里面的值即可QQ496631085 he4966.cn
            // $new_file_name = $uploadDir . $file->getSaveName();
            if (in_array($params['mimetype'], ['image/gif', 'image/jpg', 'image/jpeg', 'image/bmp', 'image/png', 'image/webp']) || in_array($suffix, ['gif', 'jpg', 'jpeg', 'bmp', 'png', 'webp'])) {

                $image = \think\Image::open('.' . $params['url']);
                $scene_type = request()->post('type', 'image_water');
                $font_path = \think\Config::get('site.water_text'); //水印字体路径
                $font_color = \think\Config::get('site.water_color') ?? '#3c3c3c'; //水印文字颜色

                switch ($scene_type) {
                    case 'product_thumb':
                        $splInfo = $image->thumb(200, 200)->save('.' .  $params['url']);
                        break;
                    case 'product_img':
                        $splInfo = $image->thumb(750, 750)->save('.' .  $params['url']);
                        break;
                    case 'product_detail_img':
                        $splInfo = $image->save('.' .  $params['url']);
                        break;
                    default:
                        $size = $this->get_text_size($font_path, '.' . \think\Config::get('site.water_font'), 30);
                        $w = $size['w'];
                        $h = $size['h'];
                        for ($w_i = 0; $w_i <= $image->width() / $w; $w_i++) {
                            for ($h_i = 0; $h_i <= $image->height() / $h; $h_i++) {
                                //循环加入文字水印
                                $image->text($font_path, '.' . \think\Config::get('site.water_font'), 20, $font_color, [$w_i * ($w + 20), $h_i * ($h + 20)], 0, 15);
                            }
                        }
                        $splInfo = $image->save('.' .  $params['url']);

                        break;
                }
            } else {
                // $splInfo = $file->validate(['size' => $size])->move(ROOT_PATH . '/public' . $uploadDir, $fileName);
            }
        }
    }




    /**
     * 图像添加文字
     *
     * @param  string  $text   添加的文字
     * @param  string  $font   字体路径
     * @param  integer $size   字号
     *
     * @return $this
     * @throws ImageException
     */
    public function get_text_size($text, $font, $size)
    {

        if (!is_file($font)) {
            throw new ImageException("不存在的字体文件：{$font}");
        }
        //获取文字信息
        $info = imagettfbbox($size, 0, $font, $text);
        $minx = min($info[0], $info[2], $info[4], $info[6]);
        $maxx = max($info[0], $info[2], $info[4], $info[6]);
        $miny = min($info[1], $info[3], $info[5], $info[7]);
        $maxy = max($info[1], $info[3], $info[5], $info[7]);
        /* 计算文字初始坐标和尺寸 */
        $x = $minx;
        $y = abs($miny);
        $w = $maxx - $minx;
        $h = $maxy - $miny;
        return ['w' => $w, 'h' => $h];
    }
}

然后就可以写个接口方法名为

upload_water_image

示例/api/com/upload_water_image