问题：swagger配置好以后，过滤器也设置了允许匿名访问。但是访问接口地址报404：
This application has no explicit mapping for /error, so you are seeing this as a fallback.

一种可能的原因：未给swagger配置资源路径，其他插件配置了资源路径，Spring MVC 找不到swagger需要的CSS、JS等资源。

解决方法：在WebMvcConfigurer中给swagger配置资源路径如下(以访问地址为swagger-ui.html为例)：

@Configuration
public class MvcConfig implements WebMvcConfigurer{
 	@Override
	public void addResourceHandlers(ResourceHandlerRegistry registry{
 		registry.addResourceHandler("/**")
                .addResourceLocations("classpath:/static/");
        registry.addResourceHandler("swagger-ui.html")
                        .addResourceLocations("classpath:/META-INF/resources/");
        registry.addResourceHandler("/webjars/**")
                        .addResourceLocations("classpath:/META-INF/resources/webjars/");
	}
}