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1. 添加依赖

<parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.6.5</version>
</parent>
<dependency><groupId>io.springfox</groupId><artifactId>springfox-boot-starter</artifactId><version>3.0.0</version>
</dependency>

2.  添加配置文件

application.yml 或applicaiton.properties 中添 必须 加如下配置

spring:mvc:pathmatch:matching-strategy: ant_path_matcher

3.  启动类上添加@EnableSwagger2 注解

4. 访问地址

http://127.0.0.1:8080/swagger-ui/index.html

 springboot其他版本可参考：Springboot ✚ Swagger各版本整理_swagger版本-CSDN博客

5. 遇到的问题

5.1 报错信息

org.springframework.context.ApplicationContextException: Failed to start bean ‘documentationPluginsBootstrapper’; nested exception is java.lang.NullPointerException

5.2 问题原因

Springfox 设置 Spring MVC 的路径匹配策略是 ant-path-matcher，而 Spring Boot 2.6.x版本的默认匹配策略是 path-pattern-matcher，这就造成了上面的报错

5.3 解决方法 

• 尝试使用 spring.mvc.pathmatch.matching-strategy: ant_path_matcher，未生效。这是网上大多数的解决办法

 实际解决方法：

@Configuration
public class WebConfiguration {@Beanpublic static BeanPostProcessor springfoxHandlerProviderBeanPostProcessor() {return new BeanPostProcessor() {@Overridepublic Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {if (bean instanceof WebMvcRequestHandlerProvider || bean instanceof WebFluxRequestHandlerProvider) {customizeSpringfoxHandlerMappings(getHandlerMappings(bean));}return bean;}private <T extends RequestMappingInfoHandlerMapping> void customizeSpringfoxHandlerMappings(List<T> mappings) {List<T> copy = mappings.stream().filter(mapping -> mapping.getPatternParser() == null).collect(Collectors.toList());mappings.clear();mappings.addAll(copy);}@SuppressWarnings("unchecked")private List<RequestMappingInfoHandlerMapping> getHandlerMappings(Object bean) {try {Field field = ReflectionUtils.findField(bean.getClass(), "handlerMappings");field.setAccessible(true);return (List<RequestMappingInfoHandlerMapping>) field.get(bean);} catch (IllegalArgumentException | IllegalAccessException e) {throw new IllegalStateException(e);}}};}
}

参考文档： SpringBoot2.6.x 整合swagger3.0 报错Failed to start bean ‘documentationPluginsBootstrapper‘_spring.mvc.pathmatch.matching-strategy 不生效-CSDN博客