Nginx has a proxy cache function, which can automatically cache content generated by backends such as Tomcat as static pages, and the expiration time can be set. You can also automatically clear these static caches on the Java side.

Here we take Nginx’s fastcgi cache as an example and use PHP to manually delete the cache:

Nginx里的配置项:
fastcgi_cache_path /png/nginx/1.5.7/ngx_fcgi_cache levels=1:2 keys_zone=WORDPRESS:512m inactive=1d max_size=1g;
以下脚本要清除页面 www.example.com/sample-page 的缓存:
/png/nginx/1.5.7/ngx_fcgi_cache/5/b6/abad4d0ad087b7eecaac98d0a2a08b65
<?php
$dir = '/png/nginx/1.5.7/ngx_fcgi_cache';
$md5 = md5('GET://www.example.com/sample-page');
$cache = $dir.'/'.substr($md5, -1, 1).'/'.substr($md5, -3, 2).'/'.$md5;
@unlink($cache);