Springboot2.6.x高版本与Swagger2版本冲突问题怎么解决

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问题:

Spring Boot 2.6.x版本引入依赖 springfox-boot-starter (Swagger 3.0) 后，启动容器会报错：

Failed to start bean ‘ documentationPluginsBootstrapper ‘ ; nested exception…

原因

Springfox 假设 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。

完整解决方案:

1. pom配置

    org.springframework.boot    spring-boot-starter-web    2.6.4    io.springfox    springfox-boot-starter    3.0.0

2. 添加Bean

import org.springframework.beans.BeansException;import org.springframework.beans.factory.config.BeanPostProcessor;import org.springframework.stereotype.Component;import org.springframework.util.ReflectionUtils;import org.springframework.web.servlet.mvc.method.RequestMappingInfoHandlerMapping;import springfox.documentation.spring.web.plugins.WebFluxRequestHandlerProvider;import springfox.documentation.spring.web.plugins.WebMvcRequestHandlerProvider; import java.lang.reflect.Field;import java.util.List;import java.util.stream.Collectors; @Componentpublic class SwaggerBeanPostProcessor implements BeanPostProcessor {    @Override    public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {        if (bean instanceof WebMvcRequestHandlerProvider || bean instanceof WebFluxRequestHandlerProvider)        {            List handlerMappings = getHandlerMappings(bean);            customizeSpringfoxHandlerMappings(handlerMappings);        }        return bean;    }     private  void customizeSpringfoxHandlerMappings(List mappings) {        List copy = mappings.stream()                .filter(mapping -> mapping.getPatternParser() == null)                .collect(Collectors.toList());        mappings.clear();        mappings.addAll(copy);    }        @SuppressWarnings("unchecked")    private List getHandlerMappings(Object bean) {        try {            Field field = ReflectionUtils.findField(bean.getClass(), "handlerMappings");            field.setAccessible(true);            return (List) field.get(bean);        }        catch (IllegalArgumentException | IllegalAccessException e) {            throw new IllegalStateException(e);        }    }}

3. swagger配置类继承 WebMvcConfigurationSupport

import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;import springfox.documentation.service.ApiInfo;import springfox.documentation.spi.DocumentationType;import springfox.documentation.spring.web.plugins.Docket; @Configurationpublic class Swagger2Config extends WebMvcConfigurationSupport {    @Bean    public Docket createRestApi() {        return new Docket(DocumentationType.SWAGGER_2)                .apiInfo(ApiInfo.DEFAULT);    }     @Override    public void addResourceHandlers(ResourceHandlerRegistry registry) {        registry.                addResourceHandler("/swagger-ui/**")                .addResourceLocations("classpath:/META-INF/resources/webjars/springfox-swagger-ui/")                .resourceChain(false);    }}

4. 访问 http://{ip}:{port}/swagger-ui/index.html

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