1、新建SpringBoot项目导入pom依赖

<?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>2.4.0</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.lian</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>
    </dependencies>

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

            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-resources-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

2、controller层

编写一个hello controller做测试

package com.lian.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
public class MyController {

    @RequestMapping("/hello")
    @ResponseBody
    public String helloWorld(){

        return "hello swagger";
    }

	//只要我们的接口中，返回值中存在实体类，它就会被扫描到swagger中
    @PostMapping(value = "/user")
    public User user(){
        return new User();
    }
}

3、配置默认版Swagger

@Configuration
@EnableSwagger2   //开启swagger2
public class SwaggerConfig {

}

测试运行

配置自定义Swagger

package com.lian.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.env.Environment;
import org.springframework.core.env.Profiles;
import springfox.documentation.builders.RequestHandlerSelectors;
import springfox.documentation.service.ApiInfo;
import springfox.documentation.service.Contact;
import springfox.documentation.service.VendorExtension;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2;

import java.util.ArrayList;

@Configuration
@EnableSwagger2   //开启swagger
public class SwaggerConfig {

    //配置了swagger的docket的bean
    @Bean
    public Docket docket(Environment environment){
        //设置要显示的swagger环境
        Profiles profiles = Profiles.of("dev", "test");
        //通过 environment.acceptsProfiles 环境监听变量，判断是否处在自己设定的环境之中
        boolean flag = environment.acceptsProfiles(profiles);


        return new Docket(DocumentationType.SWAGGER_2)
                .apiInfo(apiInfo())
                .groupName("lian")
                //enable 是否启用swagger，如果为false，则swagger不能在浏览器中访问
                .enable(flag)
                .select()
                //RequestHandlerSelectors，配置要扫描接口的方式
                //basePackage，指定要扫描的包
                //any()，扫描全部
                //none()，都不扫描
                //withClassAnnotation()，扫描类上的注解，参数是一个注解的反射对象
                //withMethodAnnotation()，扫描方法上的注解
                //.apis(RequestHandlerSelectors.basePackage("com.lian.controller"))
                //paths 过滤什么路径,只扫描带有lian下面的接口
                //.paths(PathSelectors.ant("/lian/**"))
                .build();
    }

    private ApiInfo apiInfo(){
        //作者信息
        Contact contact = new Contact("木真", "http://baidu.com", "376536577@qq.com");

        return new ApiInfo(
                "木真的swagger API文档",
                "Api Documentation",
                "1.0",
                "urn:tos",
                contact,
                "Apache 2.0",
                "http://www.apache.org/licenses/LICENSE-2.0",
                new ArrayList<VendorExtension>());
    }
    
	//配置多个docket分组
    @Bean
    public Docket docket1(){
        return new Docket(DocumentationType.SWAGGER_2).groupName("A");
    }
    @Bean
    public Docket docket2(){
        return new Docket(DocumentationType.SWAGGER_2).groupName("B");
    }
}

4、resources下配置开发&生产环境

application.properties

//激活dev环境
spring.profiles.active=dev

application-dev.properties

server.port=8081

application-pro.properties

server.port=8082

5、实体类User

添加swagger注解

package com.lian.pojo;

import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;

@ApiModel("用户实体类")
public class User {

    @ApiModelProperty("用户名")
    private String username;
    @ApiModelProperty("密码")
    private String password;
}