nignx实现图片截图与缓存（ 一）

一，使用Nginx插件 image_filter

1. 在nginx.conf配置如下

   # 我使用16进制数的方式给图片重命名
   location~*/(.*)\/([0-9a-f]+)_(\d+)x(\d+)\.(jpg|png|jpeg|gif)${
      # 如果存在文件就终止规则
      if(-f $request_filename){
          break;
      }
      
      # 设定一些参数
      set$filepath $1;
      set$filename"$2.$5";
      set$thumb    "$2_$3x$4.$5";
      set$width    $3;
      set$height   $4;
      
      # 如果原文件不存在可以直接返回404
      if(!-f $document_root/$filepath/$filename){
          return404;
      }
      # 重写URL
      rewrite/(.*)\/([0-9a-f]+)_([0-9x]+)\.(jpg|png|jpeg|gif)/$1/$2.$4break;
      # 执行图片缩放
      image_filter test;
      image_filter resize $width $height;
      image_filter_jpeg_quality75;
   }

   2.重启nginx ,然后就可以访问了 ： http://localhost:8080/mglsoft/1_600x600.jpg

   3.在公司重新整理了一下

   location~*/(.*)\/([0-9a-f]+)\.(jpg|png|jpeg|gif)@(\d+)x(\d+)Q_([rc])${
              if(-f $request_filename){
                  break;
              }
              set$filepath $1;
              set$filename"$2.$3";
              set$thumb    "$2_$4x$5.$3";
              set$width    $4;
              set$height   $5;
              set$type    $6;
              if($type='r'){
                  set $type  'image-resize'; #旋转
              }
          
              if($type='c'){
                set$type  'image-crop';#剪切
            }
          
              if(!-f $document_root/$filepath/$filename){
                  return404;
              }
              rewrite/(.*)\/([0-9a-fx_]+)\.(.*)/imgcache/$2.$4;
              if(!-f $request_filename){
                  proxy_pass $scheme://127.0.0.1:$server_port/$type/$filepath/$filename?width=$width&height=$height;
                  break;
              }
              proxy_store          $document_root/imgcache/$thumb;
              proxy_store_access   user:rw  group:rw  all:r;
              proxy_set_header    Host$host;
              expires  10d;# 设置图片过期时间10天
          }
          location/image-resize{
              rewrite/(image-resize)/(.*)/$2break;
              image_filter resize $arg_width $arg_height;
              image_filter_jpeg_quality75;
              #allow 127.0.0.0/8;
              #deny all;
          }
          location/image-crop{
              rewrite/(image-crop)/(.*)/$2break;
              image_filter crop $arg_width $arg_height;
              image_filter_jpeg_quality75;
              #allow 127.0.0.0/8;
              #deny all;
          }
      }

   通过以下路径访问: http://域名.com/test/a.jpg@240x210Q_r