添加swagger-ui依赖

<!-- swagger2 -->
<dependency>
    <groupId>io.springfox</groupId>
    <artifactId>springfox-swagger2</artifactId>
    <version>2.9.2</version>
    <exclusions>
        <exclusion>
            <groupId>io.swagger</groupId>
            <artifactId>swagger-models</artifactId>
        </exclusion>
    </exclusions>
</dependency>
<dependency>
    <groupId>com.github.xiaoymin</groupId>
    <artifactId>swagger-bootstrap-ui</artifactId>
    <version>1.9.6</version>
</dependency>

<!-- 1.5.20以上版本ui不会有警告 -->
<dependency>
    <groupId>io.swagger</groupId>
    <artifactId>swagger-models</artifactId>
    <version>1.5.24</version>
</dependency>

/**
 * http://ip:port/doc.html
 * @author admin
 * @date 2021/7/6
 */
@Configuration
@EnableSwagger2
@EnableSwaggerBootstrapUI
public class SwaggerConfiguration {
    @Bean
    public Docket createRestApi(){
        return new Docket(DocumentationType.SWAGGER_2)
                .apiInfo(apiInfo())
                .select()
                .apis(RequestHandlerSelectors.withClassAnnotation(Api.class))
                .paths(PathSelectors.any())
                .build();
    }

    private ApiInfo apiInfo() {
        return new ApiInfoBuilder()
                .title("swagger-web-api")
                .version("1.0")
                .build();
    }
}

@RestController
@RequestMapping("/api")
@Api("api")
public class DemoController {
    @PostMapping("/demo")
    @ApiOperation("demo")
    public void demo() {
    }
}

请求：http://localhost:port/doc.html