springboot使用swagger-ui出现404解决方案

swagger-ui.html出现404，解决方案，实现WebMvcConfigurer
代码：

@Configuration
@EnableSwagger2
class SwaggerConfig implements WebMvcConfigurer {

    @Bean
    public Docket createRestApi() {
        return new Docket(DocumentationType.SWAGGER_2)
                .apiInfo(apiInfo())
                .select()
                //加了ApiOperation注解的类，才生成接口文档
                .apis(RequestHandlerSelectors.withMethodAnnotation(ApiOperation.class))
                //包下的类，才生成接口文档
                //.apis(RequestHandlerSelectors.basePackage("io.renren.controller"))
                .paths(PathSelectors.any())
                .build()
                .securitySchemes(security());
    }

    private ApiInfo apiInfo() {
        return new ApiInfoBuilder()
                .title("人人开源")
                .description("renren-fast文档")
                .termsOfServiceUrl("https://www.renren.io")
                .version("3.0.0")
                .build();
    }

    private List<ApiKey> security() {
        return new ArrayList(
                new ApiKey("token", "token", "header")
        );
    }

}