knife4j简介

knife4j是springfox-swagger的增强UI实现，为Java开发者在使用Swagger的时候，提供了简洁、强大的接口文档体验。knife4j完全遵循了springfox-swagger中的使用方式，并在此基础上做了增强功能，如果你用过Swagger，你就可以无缝切换到knife4j。
文档:knife4j

快速开始

导入依赖

<!-- https://mvnrepository.com/artifact/com.github.xiaoymin/knife4j-spring-boot-starter -->
<dependency>
    <groupId>com.github.xiaoymin</groupId>
    <artifactId>knife4j-spring-boot-starter</artifactId>
    <version>2.0.4</version>
</dependency>

在Swagger2Config中增加一个@EnableKnife4j注解，该注解可以开启knife4j的增强功能；

/**
 * Swagger2API文档的配置
 */
@Configuration
@EnableSwagger2
@EnableKnife4j
public class Swagger2Config {
    
}

运行我们的SpringBoot应用，访问API文档地址即可查看：http://localhost:8088/doc.html

Spring Cloud Gateway + knife4j 聚合API文档

不同微服务的swagger配置中正常使用
搭建网关服务，作为微服务API文档的的统一入口，聚合所有微服务的API文档
在网关上添加Swagger资源配置，用于聚合其他微服务中Swagger的api-docs访问路径

@Slf4j
@Component
@Primary
@AllArgsConstructor
public class SwaggerResourceConfig implements SwaggerResourcesProvider {

    private final RouteLocator routeLocator;
    private final GatewayProperties gatewayProperties;

    @Override
    public List<SwaggerResource> get() {
        List<SwaggerResource> resources = new ArrayList<>();
        List<String> routes = new ArrayList<>();
        //获取所有路由的ID
        routeLocator.getRoutes().subscribe(route -> routes.add(route.getId()));
        //过滤出配置文件中定义的路由->过滤出Path Route Predicate->根据路径拼接成api-docs路径->生成SwaggerResource
        gatewayProperties.getRoutes().stream().filter(routeDefinition -> routes.contains(routeDefinition.getId())).forEach(route -> {
            route.getPredicates().stream()
                    .filter(predicateDefinition -> ("Path").equalsIgnoreCase(predicateDefinition.getName()))
                    .forEach(predicateDefinition -> resources.add(swaggerResource(route.getId(),
                            predicateDefinition.getArgs().get(NameUtils.GENERATED_NAME_PREFIX + "0")
                                    .replace("**", "v2/api-docs"))));
        });

        return resources;
    }

    private SwaggerResource swaggerResource(String name, String location) {
        log.info("name:{},location:{}", name, location);
        SwaggerResource swaggerResource = new SwaggerResource();
        swaggerResource.setName(name);
        swaggerResource.setLocation(location);
        swaggerResource.setSwaggerVersion("2.0");
        return swaggerResource;
    }
}

接下来我们需要自定义Swagger各个配置的节点，简单来说就是自定义Swagger内部的各个获取数据的接口

/**
 * 自定义Swagger的各个配置节点
 * Created by macro on 2020/7/9.
 */
@RestController
public class SwaggerHandler {

    @Autowired(required = false)
    private SecurityConfiguration securityConfiguration;

    @Autowired(required = false)
    private UiConfiguration uiConfiguration;

    private final SwaggerResourcesProvider swaggerResources;

    @Autowired
    public SwaggerHandler(SwaggerResourcesProvider swaggerResources) {
        this.swaggerResources = swaggerResources;
    }

    /**
     * Swagger安全配置，支持oauth和apiKey设置
     */
    @GetMapping("/swagger-resources/configuration/security")
    public Mono<ResponseEntity<SecurityConfiguration>> securityConfiguration() {
        return Mono.just(new ResponseEntity<>(
                Optional.ofNullable(securityConfiguration).orElse(SecurityConfigurationBuilder.builder().build()), HttpStatus.OK));
    }

    /**
     * Swagger UI配置
     */
    @GetMapping("/swagger-resources/configuration/ui")
    public Mono<ResponseEntity<UiConfiguration>> uiConfiguration() {
        return Mono.just(new ResponseEntity<>(
                Optional.ofNullable(uiConfiguration).orElse(UiConfigurationBuilder.builder().build()), HttpStatus.OK));
    }

    /**
     * Swagger资源配置，微服务中这各个服务的api-docs信息
     */
    @GetMapping("/swagger-resources")
    public Mono<ResponseEntity> swaggerResources() {
        return Mono.just((new ResponseEntity<>(swaggerResources.get(), HttpStatus.OK)));
    }
}