No mapping for GET /swagger-ui.html

这是在@EnableWebMvc的注释之下，原先swagger2的默认地址失效了，所有需要重新配置

在SwaggerConfig配置类中继承 WebMvcConfigurer，重写addResourceHandlers方法

    @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/");
        WebMvcConfigurer.super.addResourceHandlers(registry);

    }