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Spring Boot整合Knife4j-3.0.3

1. 引言

前面我写过一篇关于整合knife4j的文档 Spring Boot整合Knife4j-2.0.7
最近我引入redission的时候莫名其妙的抛出异常：

Failed to start bean 'documentationPluginsBootstrapper'; nested exception is java.lang.NullPointerException

原因：

springboot的版本和Springfox-Swagge的版本不兼容

2. 快捷的解决方案

2.1 修改knife4j的依赖

knife4j依赖

<dependency><groupId>com.github.xiaoymin</groupId><artifactId>knife4j-spring-boot-starter</artifactId><version>3.0.3</version>
</dependency>

springboot版本

<parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.7.5</version>
</parent>

2.2 application.yml增加配置

spring:mvc:pathmatch:matching-strategy: ANT_PATH_MATCHER

这个不能少，否则接口html页面显示不出来

3.3 SwaggerConfig配置如下

package com.jiayuan.common.config;import com.github.xiaoymin.knife4j.spring.annotations.EnableKnife4j;
import com.github.xiaoymin.knife4j.spring.extension.OpenApiExtensionResolver;
import com.jiayuan.common.constant.Constant;
import io.swagger.annotations.ApiOperation;
import lombok.AllArgsConstructor;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.util.ReflectionUtils;
import org.springframework.web.servlet.mvc.method.RequestMappingInfoHandlerMapping;
import springfox.documentation.builders.ApiInfoBuilder;
import springfox.documentation.builders.PathSelectors;
import springfox.documentation.builders.RequestHandlerSelectors;
import springfox.documentation.service.ApiInfo;
import springfox.documentation.service.ApiKey;
import springfox.documentation.service.SecurityScheme;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.spring.web.plugins.WebFluxRequestHandlerProvider;
import springfox.documentation.spring.web.plugins.WebMvcRequestHandlerProvider;
import springfox.documentation.swagger2.annotations.EnableSwagger2;
import springfox.documentation.swagger2.annotations.EnableSwagger2WebMvc;import java.lang.reflect.Field;
import java.util.List;
import java.util.stream.Collectors;import static com.google.common.collect.Lists.newArrayList;/*** Swagger配置** @author xmc*/
@Configuration
@EnableSwagger2
@AllArgsConstructor
@EnableKnife4j
public class SwaggerConfig {private final OpenApiExtensionResolver openApiExtensionResolver;@Beanpublic Docket createRestApi() {return new Docket(DocumentationType.SWAGGER_2).apiInfo(apiInfo()).select()//加了ApiOperation注解的类，生成接口文档.apis(RequestHandlerSelectors.withMethodAnnotation(ApiOperation.class))//包下的类，生成接口文档//.apis(RequestHandlerSelectors.basePackage("com.jiayuan.modules.job.controller")).paths(PathSelectors.any()).build().extensions(openApiExtensionResolver.buildExtensions("criticalVal-management-system")).directModelSubstitute(java.util.Date.class, String.class).securitySchemes(security());}private ApiInfo apiInfo() {return new ApiInfoBuilder().title("危急值管理系统").description("cvms-api文档").version("1.0").build();}private List<SecurityScheme> security() {return newArrayList(new ApiKey(Constant.TOKEN_HEADER, Constant.TOKEN_HEADER, "header"));}@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);}}};}}