Nginx http_image_filter_module 图片缩放模块

来源：互联网发布：寿喜锅知乎编辑：程序博客网时间：2024/06/10 21:48

http_image_filter_module 模块用来裁剪过大的图片(JPEG, GIF, PNG)到指定大小，是nginx自带模块，默认不会开启HttpImageFilterModule需要在编译要带上参数 –with-http_image_filter_module。官方文档http://wiki.nginx.org/HttpImageFilterModule

http_image_filter_module 主要有一下几个指令

/* 旋转图片 */
image_filter rotate 90 | 180 | 270
/* 等比例缩放图片 */
image_filter resize width height
/* 按大小缩放图片 */
image_filter crop width height
/* 单图片缓存大小超过该大小返回415 */
image_filter_buffer size
/* 设置JPEG图片缩放后的质量默认75 最高95 */
image_filter_jpeg_quality value

简单介绍后开始测试吧

由于Nginx http_image_filter_module 模块内部依赖与gd库，所以先安装gd依赖
sudo apt-get install libgd2-xpm libgd2-xpm-dev
安装Nginx
./configure --prefix=/usr/local/nginx --with-http_image_filter_module

配置http_image_filter_module模块

location ~* /images/(.+)_(\d+)x(\d+)\.(jpg|gif|png)$ {    root /var/www;    set $width $2;    set $height $3;    image_filter_buffer 5M;    image_filter resize $width $height;    if ($height = "0") {        rewrite /images/(.+)_(\d+)x(\d+)\.(jpg|gif|png)$ /images/$1.$4 last;    }    if ($width = "0") {        rewrite /images/(.+)_(\d+)x(\d+)\.(jpg|gif|png)$ /images/$1.$4 last;    }    try_files /images/$1.$4  /images/404.jpg;}

启动nginx
sudo /usr/local/nginx/sbin/nginx
启动成功后在浏览器输入 http://localhost/images/test_400x400.jpg 如果没有错误返回的就是缩放后的图片

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