SpringBoot实现缓存静态资源。

主要是使用tomcat的ExpiresFilter来实现，我们初始化ExpiresFilter过滤器即可

@Bean
public FilterRegistrationBean basicFilterRegistrationBean() {
        FilterRegistrationBean registrationBean = new FilterRegistrationBean();
        ExpiresFilter expiresFilter = new ExpiresFilter();
        registrationBean.setFilter(expiresFilter);
        registrationBean.addInitParameter("ExpiresByType image", "access plus 30 minutes");
        registrationBean.addInitParameter("ExpiresByType text/css", "access plus 30 minutes");
        registrationBean.addInitParameter("ExpiresByType text/javascript", "access plus 30 minutes");
        registrationBean.addInitParameter("ExpiresByType application/javascript", "access plus 30 minutes");
        List<String> urlPatterns = new ArrayList<String>();
        urlPatterns.add("/*");
        registrationBean.setOrder(0);
        registrationBean.setUrlPatterns(urlPatterns);
        registrationBean.setDispatcherTypes(DispatcherType.REQUEST);
        return registrationBean;
}

这里设置的是缓存30分钟，主要缓存文件有image、css、javascript的信息

注意：

如果静态资源目录不是默认的resources等目录，需要指定下目录

@Bean
public WebMvcConfigurerAdapter webMvcConfigurerAdapter() {
		WebMvcConfigurerAdapter wmca = new WebMvcConfigurerAdapter() {
			@Override
			public void addResourceHandlers(ResourceHandlerRegistry registry) {
				registry.addResourceHandler("/static/**").addResourceLocations("/static/");
				super.addResourceHandlers(registry);
			}
		};
		return wmca;
}

上面的static为静态资源所在的目录