springCloudGateway + Knife4j + Nacos 聚合接口文档

        最近在搞微服务项目需要提供API，但是单个服务访问不太友好，想做一个聚合，所以使用了Knife4j 。网上好多整合Knife4j 的文档，尝试了一下大部分都是失败的状态(可能是楼主整合的不对)，所以自己整合完后记录一下。

        提供一下Knife4j官网:Knife4j · 集Swagger2及OpenAPI3为一体的增强解决方案. | Knife4j

一、引入依赖

        全局配合springboot只需要引入一个依赖就可以了，无论是网关，还是其他的子服务，都需要引入如下的依赖：

    
        com.github.xiaoymin
        knife4j-spring-boot-starter
        3.0.3
    

        这里面使用了3.0.3版本，因为楼主在尝试其他版本的时候发现会有很多问题，如404，资源找不到的问题

二、服务配置

2.1、网关-SpringCloudGateway

import lombok.AllArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.gateway.config.GatewayProperties;
import org.springframework.cloud.gateway.route.RouteLocator;
import org.springframework.cloud.gateway.support.NameUtils;
import org.springframework.context.annotation.Primary;
import org.springframework.stereotype.Component;
import springfox.documentation.swagger.web.SwaggerResource;
import springfox.documentation.swagger.web.SwaggerResourcesProvider;

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

/**
 * SwaggerProvider：
 *        获取nacos当中注册的服务名称，以服务名称拼接接口文档路径，组成完成的接口文档访问路径
 */
@Slf4j
@Component
@Primary
@AllArgsConstructor
public class SwaggerResourceConfig implements SwaggerResourcesProvider {

    private final RouteLocator routeLocator;

    private final GatewayProperties gatewayProperties;


    @Override
    public List get() {
        List resources = new ArrayList<>();

        List routes = new ArrayList<>();

        routeLocator.getRoutes().subscribe(route -> routes.add(route.getId()));

        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;
    }
}

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import reactor.core.publisher.Mono;
import springfox.documentation.swagger.web.*;

import java.util.Optional;

/**
 * SwaggerHandler：获取接口文档
 */
@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;
    }

    @GetMapping("/swagger-resources/configuration/security")
    public Mono> securityConfiguration() {
        return Mono.just(new ResponseEntity<>(
                Optional.ofNullable(securityConfiguration).orElse(SecurityConfigurationBuilder.builder().build()), HttpStatus.OK));
    }

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

    @GetMapping("/swagger-resources")
    public Mono swaggerResources() {
        return Mono.just((new ResponseEntity<>(swaggerResources.get(), HttpStatus.OK)));
    }
}

2.2、配置文件 

    gateway:
      discovery:
        locator:
          lower-case-service-id: true
      routes:
        - id: system
          uri: lb://xxxx-system-xxxxx
          predicates:
            - Path=/system/**
          filters:
            - StripPrefix= 1  #截取去掉/system/ 这个要配置正确

2.3、其他服务配置

        依赖已经抽取了公共，此处就不引入了。

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import springfox.documentation.builders.ApiInfoBuilder;
import springfox.documentation.builders.PathSelectors;
import springfox.documentation.builders.RequestHandlerSelectors;
import springfox.documentation.service.ApiInfo;
import springfox.documentation.service.Contact;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2WebMvc;

@Configuration
@EnableSwagger2WebMvc
public class SwaggerConfiguration {

    @Bean
    public Docket getDocket() {
        return new Docket(DocumentationType.SWAGGER_2)
                .apiInfo(getApiInfoBuilder())
                .select()
                .apis(RequestHandlerSelectors.basePackage("cn.xx.xx.xxxx.controller"))
                .paths(PathSelectors.any())
                .build();
    }

    private ApiInfo getApiInfoBuilder() {
        return new ApiInfoBuilder()
                .title("Knife4j-mic-order文档")
                .description("
swagger-bootstrap-ui-demo RESTful APIs
")
                .termsOfServiceUrl("服务url")
                .contact(new Contact("xxx", "url", "[email protected]"))
                .version("1.0")
                .build();
    }
}

三、访问

        使用网关的地址访问：http://127.0.0.1:9090/doc.html