springboot中swagger的使用以及404的情况处理

spring boot 都是自动配置和注册的，但是在配置好swagger时，访问http://localhost:8080/swagger-ui.html#/
404报错如下：

No mapping foundfor HTTP request with URI[/swagger-ui.html]in DispatcherServlet

原因：springboot没有注册资源处理器，需要手动配置静态资源映射:

package com.springbootdemo.config;import org.springframework.context.annotation.Configuration;import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;  @Configuration public class WebMvcConfig extends WebMvcConfigurerAdapter{     @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/");         super.addResourceHandlers(registry);}}