一、集成
1、新建web工程
2、导入依赖。

<dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>3.0.0</version>
        </dependency>
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger-ui</artifactId>
            <version>3.0.0</version>
        </dependency>

完整pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.5.6</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.li</groupId>
    <artifactId>swagger_demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>swagger_demo</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>2.9.2</version>
        </dependency>
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger-ui</artifactId>
            <version>2.9.2</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

3、编写第一个hello工程。
在Controller中创建HelloController，

package com.li.swagger.Controller;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloController {
    @RequestMapping(value="/hello")
  public String hello(){
      return "hello";
  }
}

测试：成功。
4、配置Swagger
创建Config=>SwaggerConfig,

package com.li.swagger.Config;

import org.springframework.context.annotation.Configuration;
import springfox.documentation.swagger2.annotations.EnableSwagger2;
//配置Swagger
@Configuration
@EnableSwagger2 //开启Swagger2
public class SwaggerConfig {
}

5、访问页面
在浏览器中输入：

http://localhost:8080/swagger-ui.html

测试成功。

二、配置

package com.li.swagger.Config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import springfox.documentation.service.ApiInfo;
import springfox.documentation.service.Contact;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2;

import java.util.ArrayList;

//配置Swagger
@Configuration
@EnableSwagger2 //开启Swagger2
public class SwaggerConfig {
    //    配置了Swagger的Docket的bean实列
    @Bean
    public Docket docket() {
        return new Docket(DocumentationType.SWAGGER_2).apiInfo(apiInfo());
    }

    private ApiInfo apiInfo() {
        //作者信息
        Contact contact = new Contact("YK", "http://www.baidu.com", "2335000344@qq.com");
        return new ApiInfo("YK开发文档", "加油", "v1.0", "http://www.baidu.com",
                contact, "Apache2.0", "http://www.apache.org/licenses/LICENSE-2.0", new ArrayList());
    }
}

在浏览器中输入：

http://localhost:8080/swagger-ui.html

出现和上图类似。