spring-boot2.6.x兼容swagger2問題

更改spring-boot2.6.x版本的默認匹配策略

springfox 使用的是 ant_path_matcher 匹配策略

spring:
# ant_path_matcher、（spring-boot2.6.x默認匹配策略）path-pattern-matcher
  mvc:
    pathmatch:
      matching-strategy: ant_path_matcher

依賴

解決 io.swagger.models.parameters.AbstractSerializableParameter.getExample 的空指針異常，引入swagger-models依賴

		<!--swagger2-->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-boot-starter</artifactId>
            <version>3.0.0</version>
        </dependency>
        <!-- 解決 io.swagger.models.parameters.AbstractSerializableParameter.getExample 的空指針異常 -->
        <dependency>
            <groupId>io.swagger</groupId>
            <artifactId>swagger-models</artifactId>
            <version>1.6.6</version>
        </dependency>
        <dependency>
            <groupId>com.github.xiaoymin</groupId>
            <artifactId>swagger-bootstrap-ui</artifactId>
            <version>1.9.6</version>
        </dependency>
        

SwaggerBeanPostProcessor 配置

package cn.springboot.model.base.config;

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;

/**
 * 兼容 springboot 2.6.x 處理
 *
 * @author jf
 */
@Component
public class SwaggerBeanPostProcessor implements BeanPostProcessor {
    @Override
    public 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");
            assert field != null;
            field.setAccessible(true);
            return (List<RequestMappingInfoHandlerMapping>) field.get(bean);
        } catch (IllegalArgumentException | IllegalAccessException e) {
            throw new IllegalStateException(e);
        }
    }
}

SwaggerConfig 配置

package cn.springboot.model.base.config;

import io.swagger.models.auth.In;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.util.ResourceUtils;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import springfox.documentation.builders.ApiInfoBuilder;
import springfox.documentation.builders.PathSelectors;
import springfox.documentation.builders.RequestHandlerSelectors;
import springfox.documentation.service.*;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spi.service.contexts.SecurityContext;
import springfox.documentation.spring.web.plugins.Docket;

import java.util.ArrayList;
import java.util.List;

/**
 * Swagger2 的接口配置
 *
 * @author jf
 */
@Configuration
public class SwaggerConfig { //implements WebMvcConfigurer {
    /**
     * 系統基礎配置
     */
    @Autowired
    private ModelConfig modelConfig;

    /**
     * 是否開啟swagger
     */
    @Value("${swagger.enabled}")
    private boolean enabled;

    /**
     * 設置請求的統一前綴
     */
    @Value("${swagger.pathMapping}")
    private String pathMapping;

    /**
     * 分組:sys管理
     *
     * @return Docket
     */
    @Bean
    public Docket sys_api_app() {
        return new Docket(DocumentationType.SWAGGER_2)
                // 是否啟用Swagger
                .enable(enabled)
                .apiInfo(apiInfo("標題：學生管理_API", "學生"))
                .select()
                .apis(RequestHandlerSelectors.basePackage("cn.springboot.model.web.controller"))
//                .apis(RequestHandlerSelectors.withMethodAnnotation(ApiOperation.class))
                // .apis(RequestHandlerSelectors.any())
//                .paths(PathSelectors.any())
                .paths(PathSelectors.ant("/stu/**"))
                .build()
                .groupName("學生")
                .securitySchemes(securitySchemes())
                .securityContexts(securityContexts())
                .pathMapping(pathMapping);
    }

    @Bean
    public Docket clas_api_app() {
        return new Docket(DocumentationType.SWAGGER_2)
                // 是否啟用Swagger
                .enable(enabled)
                .apiInfo(apiInfo("標題：班級管理_API", "班級"))
                .select()
                .apis(RequestHandlerSelectors.basePackage("cn.springboot.model.web.controller"))
//                .apis(RequestHandlerSelectors.withMethodAnnotation(ApiOperation.class))
                // .apis(RequestHandlerSelectors.any())
//                .paths(PathSelectors.any())
                .paths(PathSelectors.ant("/class/**"))
                .build()
                .groupName("班級")
                .securitySchemes(securitySchemes())
                .securityContexts(securityContexts())
                .pathMapping(pathMapping);
    }

    /**
     * 安全模式，這里指定token通過Authorization頭請求頭傳遞
     */
    private List<SecurityScheme> securitySchemes() {
        List<SecurityScheme> apiKeyList = new ArrayList<SecurityScheme>();
        apiKeyList.add(new ApiKey("Authorization", "Authorization", In.HEADER.toValue()));
        return apiKeyList;
    }

    /**
     * 安全上下文
     */
    private List<SecurityContext> securityContexts() {
        List<SecurityContext> securityContexts = new ArrayList<>();
        securityContexts.add(
                SecurityContext.builder()
                        .securityReferences(defaultAuth())
//                        .forPaths(o -> o.matches("/.*"))
                        .build());
        return securityContexts;
    }

    /**
     * 默認的安全上引用
     */
    private List<SecurityReference> defaultAuth() {
        AuthorizationScope authorizationScope = new AuthorizationScope("global", "accessEverything");
        AuthorizationScope[] authorizationScopes = new AuthorizationScope[1];
        authorizationScopes[0] = authorizationScope;
        List<SecurityReference> securityReferences = new ArrayList<>();
        securityReferences.add(new SecurityReference("Authorization", authorizationScopes));
        return securityReferences;
    }

    /**
     * 構建api文檔的詳細信息
     *
     * @param title       標題
     * @param description 描述
     * @return ApiInfo
     */
    private ApiInfo apiInfo(String title, String description) {
        return new ApiInfoBuilder()
                .title(title)
                .description(description)
                // 作者信息
                .contact(new Contact(modelConfig.getName(), null, null))
                .version("版本號:" + modelConfig.getVersion())
                .build();
    }

//    @Override
//    public void addResourceHandlers(ResourceHandlerRegistry registry) {
//        registry.addResourceHandler("swagger-ui.html")
//                .addResourceLocations("classpath:/META-INF/resources/");
//        registry.addResourceHandler("/webjars/**")
//                .addResourceLocations("classpath:/META-INF/resources/webjars/");
//        registry.addResourceHandler("/static/**")
//                .addResourceLocations(ResourceUtils.CLASSPATH_URL_PREFIX + "/static/");
//        WebMvcConfigurer.super.addResourceHandlers(registry);
//    }
}