讲在前面：在spring引入swagger时，由于使用的JDK、Spring、swagger 的版本不匹配，导致启动报错，一直存在版本依赖问题。所以在此声明清楚使用版本。JDK 1.8、Spring boot 2.6.13、 Swagger 2.9.2。

1. 引入maven依赖

<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>

2. 引入配置文件 swaggerConfiger

package com.example.swaggertest.demos.web;


import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import springfox.documentation.builders.ApiInfoBuilder;
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 org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;

@Configuration
@EnableWebMvc
@EnableSwagger2
public class SwaggerConfig implements WebMvcConfigurer {
    @Bean
    public Docket ApiConfig() {
        return new Docket(DocumentationType.SWAGGER_2)
                .apiInfo(apiInfo())
                .select()
                .build();
    }

    private ApiInfo apiInfo(){
        return new ApiInfoBuilder()
                .title("swagger api demo")
                .description("swagger api demo")
                .version("1.0")
                .contact(new Contact("测试", "http://XXXX", "xxx@163.com"))
                .build();
    }

    @Override    //开发swagger-ui.html 接口，否则，请求localhost/8080/swagger-ui.html 报错：不存在该mapping
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/**").addResourceLocations("classpath:/static/");
        registry.addResourceHandler("swagger-ui.html").addResourceLocations("classpath:/META-INF/resources/");
        registry.addResourceHandler("doc.html").addResourceLocations("classpath:/META-INF/resources/");
        registry.addResourceHandler("/webjars/**").addResourceLocations("classpath:/META-INF/resources/webjars/");
    }

}