附件十二 TP5 图片处理增强类支持缩略图在线显示 · ThinkPHP5高阶实战教程 --诠释为API开发而生

# 附件十二 TP5 图片处理增强类支持缩略图在线显示 ## 控制器中调用方法根据图片MD5值显示或下载图片 > 使用方法其实就一个话 >显示 > Image::open($path)->showImage($width,$height); >下载 > Image::open($path)->downloadImage($width,$height); > 这样你的图片就可以根据你的需求自定义改变大小 > 也可以增加权限控制 > 你还可以第一次访问时候生成永久的缩略图 > 你甚至可以配合路由使用隐藏真实图片地址 > 你的域名/upload/showPicture/[MD5值]/480_600 ~~~ /** * Power: Mikkle * Email：776329498@qq.com * @param string $md5 * @param string $size */ public function showPicture($md5="",$size="480_600") { $size_array = explode("_",$size); $width = is_numeric($size_array[0])?$size_array[0]:480; $height = is_numeric($size_array[1])?$size_array[1]:600; //根据图片MD5值获取路径 $path = Upload::getPicturePathByMd5($md5); if($path){ Image::open($path)->showImage($width,$height); } return; } /** * Power: Mikkle * Email：776329498@qq.com * @param string $md5 * @param string $size */ public function downloadPicture($md5="",$size="0_0") { if($size!="0_0"){ $size_array = explode("_",$size); $width = is_numeric($size_array[0])?$size_array[0]:480; $height = is_numeric($size_array[1])?$size_array[1]:600; //根据图片MD5值获取路径 $path = Upload::getPicturePathByMd5($md5); Image::open($path)->downloadImage($width,$height); return; }else{ Upload::downloadPictureByMd5($md5); } } ~~~ ## 在线显示路由配置 > 你的域名/upload/showPicture/[MD5值]/[宽度]_[高度] 当然路由你可以随意设置 ~~~ '[upload]' => [ 'show_images/:md5/:size' => [ 'system/file/showPicture', ['method' => 'get'], ['size' => '\d+_\d+', 'md5' => '(\w+)'], ['ext' => ['jpg', 'png']], ], 'down_images/:md5/[:size]' => [ 'system/file/downloadPicture', ['method' => 'get'], ['size' => '\d+_\d+', 'md5' => '(\w+)'], ['ext' => ['jpg', 'png']], ], 'down_files/:md5' => [ 'system/file/downloadFiles', ['method' => 'get'], [ 'md5' => '(\w+)'], ['ext' => ['jpg', 'png']], ], ], ~~~ ## Image类增强源码 > app\base\controller\Image ~~~ <?php /** * Created by PhpStorm. * Power By Mikkle * Email：776329498@qq.com * Date: 2017/8/3 * Time: 15:29 */ namespace app\base\controller; use think\Response; use think\Image as thinkImage; use think\image\Exception as ImageException; class Image extends thinkImage { /** * 显示自定义尺寸缩略图 * Power: Mikkle * Email：776329498@qq.com * @param int $w * @param int $h */ public function showImage($w=200,$h=200){ if($w>600) $w=600; if($h>800) $h=800; $this->thumb($w,$h); Header("Content-type: image/png"); ob_start(); //打开缓冲区 imagepng($this->im, null, 9); ob_end_flush();//输出全部内容到浏览器 die; return; } /** * 下载自定义尺寸图片 * Power: Mikkle * Email：776329498@qq.com * @param int $w * @param int $h */ public function downloadImage($w=200,$h=200){ $this->thumb($w,$h); header("Content-type: octet/stream"); header("Content-disposition:attachment;filename=image.png;"); ob_start(); //打开缓冲区 imagepng($this->im, null, 9); ob_end_flush();//输出全部内容到浏览器 die; return; } /** * 根据路径加载图片文件 * Power: Mikkle * Email：776329498@qq.com * @param \SplFileInfo|string $file * @return Image */ public static function open($file) { if (is_string($file)) { $file = new \SplFileInfo($file); } if($file){ } if (!$file->isFile()) { throw new ImageException('image file not exist'); } return new self($file); } } ~~~