刨根问底：Spring Boot中HandlerInterceptor没有拦截静态资源问题

在Spring Boot中设置了HandlerInterceptor，发现对于js、css等文件都没有起作用。定义一个HandlerInterceptor

将HandlerInterceptor匹配到所有路径

这时虽然PathPatterns设置了“/**”，但是发现FooInterceptor对静态资源没有起作用。这时看看addInterceptors方法上的注释。

Add Spring MVC lifecycle interceptors for pre- and post-processing of controller method invocations. Interceptors can be registered to apply to all requests or be limited to a subset of URL patterns.Notethat interceptors registered here only apply to controllers and not to resource handler requests. To intercept requests for static resources either declare a MappedInterceptor bean or switch to advanced configuration mode by extending WebMvcConfigurationSupport and then override resourceHandlerMapping.

说明它只对controller起作用，如果想对静态资源起作用，简单的方法是添加一个MappedInterceptor bean。