1. pom配置

<!-- https://mvnrepository.com/artifact/io.springfox/springfox-swagger-ui -->
<dependency><groupId>io.springfox</groupId><artifactId>springfox-swagger-ui</artifactId><version>3.0.0</version>
</dependency><!-- https://mvnrepository.com/artifact/io.springfox/springfox-swagger2 -->
<dependency><groupId>io.springfox</groupId><artifactId>springfox-swagger2</artifactId><version>3.0.0</version>
</dependency>

2. 增加swagger自动配置类

import org.springframework.context.annotation.Configuration;
import springfox.documentation.oas.annotations.EnableOpenApi;@Configuration
@EnableSwagger2
public class SwaggerConfig {@Beanpublic Docket api() {return new Docket(DocumentationType.OAS_30).select().apis(RequestHandlerSelectors.basePackage("com.example.controller")).build();}private SecurityScheme apiKey() {return new ApiKey("JWT", "Authorization", "header");}
}

此时尝试启动应用会提示一下错误：

Caused by: org.springframework.context.ApplicationContextException: Failed to start bean 'documentationPluginsBootstrapper'; nested exception is java.lang.NullPointerException

Caused by: org.springframework.context.ApplicationContextException: Failed to start bean 'documentationPluginsBootstrapper'; nested exception is java.lang.NullPointerExceptionat org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:181)at org.springframework.context.support.DefaultLifecycleProcessor.access$200(DefaultLifecycleProcessor.java:54)at org.springframework.context.support.DefaultLifecycleProcessor$LifecycleGroup.start(DefaultLifecycleProcessor.java:356)at java.lang.Iterable.forEach(Iterable.java:75)at org.springframework.context.support.DefaultLifecycleProcessor.startBeans(DefaultLifecycleProcessor.java:155)at org.springframework.context.support.DefaultLifecycleProcessor.onRefresh(DefaultLifecycleProcessor.java:123)at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:935)at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:586)at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:145)at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:740)at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:415)at org.springframework.boot.SpringApplication.run(SpringApplication.java:303)at org.springframework.boot.web.servlet.support.SpringBootServletInitializer.run(SpringBootServletInitializer.java:175)at org.springframework.boot.web.servlet.support.SpringBootServletInitializer.createRootApplicationContext(SpringBootServletInitializer.java:155)at org.springframework.boot.web.servlet.support.SpringBootServletInitializer.onStartup(SpringBootServletInitializer.java:97)at org.springframework.web.SpringServletContainerInitializer.onStartup(SpringServletContainerInitializer.java:174)at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5221)at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)... 44 moreCaused by: java.lang.NullPointerExceptionat springfox.documentation.spring.web.WebMvcPatternsRequestConditionWrapper.getPatterns(WebMvcPatternsRequestConditionWrapper.java:56)at springfox.documentation.RequestHandler.sortedPaths(RequestHandler.java:113)at springfox.documentation.spi.service.contexts.Orderings.lambda$byPatternsCondition$3(Orderings.java:89)at java.util.Comparator.lambda$comparing$77a9974f$1(Comparator.java:469)at java.util.TimSort.countRunAndMakeAscending(TimSort.java:355)at java.util.TimSort.sort(TimSort.java:234)at java.util.Arrays.sort(Arrays.java:1512)at java.util.ArrayList.sort(ArrayList.java:1464)at java.util.stream.SortedOps$RefSortingSink.end(SortedOps.java:387)at java.util.stream.Sink$ChainedReference.end(Sink.java:258)at java.util.stream.Sink$ChainedReference.end(Sink.java:258)at java.util.stream.Sink$ChainedReference.end(Sink.java:258)at java.util.stream.Sink$ChainedReference.end(Sink.java:258)at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:483)at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472)at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499)at springfox.documentation.spring.web.plugins.WebMvcRequestHandlerProvider.requestHandlers(WebMvcRequestHandlerProvider.java:81)at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1384)at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482)at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472)at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499)at springfox.documentation.spring.web.plugins.AbstractDocumentationPluginsBootstrapper.withDefaults(AbstractDocumentationPluginsBootstrapper.java:107)at springfox.documentation.spring.web.plugins.AbstractDocumentationPluginsBootstrapper.buildContext(AbstractDocumentationPluginsBootstrapper.java:91)at springfox.documentation.spring.web.plugins.AbstractDocumentationPluginsBootstrapper.bootstrapDocumentationPlugins(AbstractDocumentationPluginsBootstrapper.java:82)at springfox.documentation.spring.web.plugins.DocumentationPluginsBootstrapper.start(DocumentationPluginsBootstrapper.java:100)at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:178)... 61 more

3. 配置修改

spring:mvc:pathmatch:matching-strategy: ant_path_matcher

4. 自动配置类增加以下内容

@Bean
public WebMvcEndpointHandlerMapping webEndpointServletHandlerMapping(WebEndpointsSupplier webEndpointsSupplier,ServletEndpointsSupplier servletEndpointsSupplier,ControllerEndpointsSupplier controllerEndpointsSupplier,EndpointMediaTypes endpointMediaTypes,CorsEndpointProperties corsProperties,WebEndpointProperties webEndpointProperties,Environment environment) {List<ExposableEndpoint<?>> allEndpoints = new ArrayList();Collection<ExposableWebEndpoint> webEndpoints = webEndpointsSupplier.getEndpoints();allEndpoints.addAll(webEndpoints);allEndpoints.addAll(servletEndpointsSupplier.getEndpoints());allEndpoints.addAll(controllerEndpointsSupplier.getEndpoints());String basePath = webEndpointProperties.getBasePath();EndpointMapping endpointMapping = new EndpointMapping(basePath);boolean shouldRegisterLinksMapping = this.shouldRegisterLinksMapping(webEndpointProperties, environment, basePath);return new WebMvcEndpointHandlerMapping(endpointMapping, webEndpoints,endpointMediaTypes, corsProperties.toCorsConfiguration(),new EndpointLinksResolver(allEndpoints, basePath),shouldRegisterLinksMapping, null);
}private boolean shouldRegisterLinksMapping(WebEndpointProperties webEndpointProperties,Environment environment, String basePath) {return webEndpointProperties.getDiscovery().isEnabled() &&(StringUtils.hasText(basePath) ||ManagementPortType.get(environment).equals(ManagementPortType.DIFFERENT));
}

参考

Spring Boot 2.6.0 / Spring fox 3 - Failed to start bean ‘documentationPluginsBootstrapper’