1、创建springboot项目
步骤见https://blog.csdn.net/u012069313/article/details/122319305
2、添加Maven依赖
swagger2.9及以下版本添加如何依赖：

<!-- Swagger -->
<dependency>
    <groupId>io.springfox</groupId>
    <artifactId>springfox-swagger2</artifactId>
</dependency>
<dependency>
    <groupId>io.springfox</groupId>
    <artifactId>springfox-swagger-ui</artifactId>
</dependency>

swagger2.10开始支持两种模式：WebFlux，WebMVC，添加以下依赖（以WebMVC为例）：

<dependency>
    <groupId>io.springfox</groupId>
    <artifactId>springfox-swagger2</artifactId>
    <version>2.10.5</version>
</dependency>
<dependency>
    <groupId>io.springfox</groupId>
    <artifactId>springfox-swagger-ui</artifactId>
    <version>2.10.5</version>
</dependency>
<dependency>
    <groupId>io.springfox</groupId>
    <artifactId>springfox-spring-webmvc</artifactId>
    <version>2.10.5</version>
</dependency>

3、application.yml中添加配置：

swagger:
  title: swagger-test
  description: swagger-test
  version: 1.0
  terms-of-service-url: http://127.0.0.1:8080
  contact:
    name: swagger-test
    url: http://127.0.0.1:8080
    email: test@chaoyue.com

4、添加配置类

@EnableSwagger2WebMvc //swagger2.9及以下版本为@EnableSwagger2
@Configuration
public class Swagger2Config {
    @Bean
    public Docket createRestApi() {
        return new Docket(DocumentationType.SWAGGER_2)
                .apiInfo(apiInfo())
                .select()
                .apis(RequestHandlerSelectors.basePackage("com.chaoyue.swagger2test.controller"))
                .paths(PathSelectors.any())
                .build();
    }
    private ApiInfo apiInfo() {
        return new ApiInfoBuilder()
                .title("api接口文档")
                .contact(new Contact("test","http://127.0.0.1:8080","test@chaoyue.com"))
                .version("1.0")
                .description("api描述")
                .build();
    }
}

5、Controller中添加注解

@Api("HelloController")
@RestController
public class HelloController {
    @GetMapping(value = "/user")
    public String getUser() {
        return "user";
    }
}

6、测试
输入测试地址：http://localhost:8080/swagger-ui.html