Spring Cloud Gateway 集成 Nacos、Knife4j

官方文档地址：Spring Cloud Gateway集成Knife4j
官方完整源码：https://gitee.com/xiaoym/swagger-bootstrap-ui-demo
自己搭建的源码地址：https://gitee.com/sheng-wanping/spring-boot-gateway

其实Knife4j官方文档写的很全，自己也是按照文档搭建的，这里记录一下自己的搭建过程：
由于公司使用的springboot版本较低，是2.1.3.RELEASE，因此其他组件使用了对应较低版本。

• springboot版本：2.1.3.RELEASE
• nacos 版本：2.1.4.RELEASE
• gateway版本：2.1.0.RELEASE
• knife4j版本：2.0.2

springboot 其他版本可以参考：spring-cloud-alibaba 版本对应说明

1、gateway网关配置

1.1 pom 配置

<!-- nacos 配置和注册中心 -->
<dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
</dependency>
<dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
</dependency><!-- Gateway 网关相关 -->
<dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-gateway</artifactId>
</dependency><!-- knife4j -->
<dependency><groupId>com.github.xiaoymin</groupId><artifactId>knife4j-spring-boot-starter</artifactId>
</dependency>

2.2 配置文件

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;@Slf4j
@Component
@Primary
@AllArgsConstructor
public class SwaggerResourceConfig implements SwaggerResourcesProvider {private final RouteLocator routeLocator;private final GatewayProperties gatewayProperties;@Overridepublic List<SwaggerResource> get() {List<SwaggerResource> resources = new ArrayList<>();List<String> 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;/*** @author xiaoymin* 2020年10月29日 18:38:01*/
@RestController
public class SwaggerHandler {@Autowired(required = false)private SecurityConfiguration securityConfiguration;@Autowired(required = false)private UiConfiguration uiConfiguration;private final SwaggerResourcesProvider swaggerResources;@Autowiredpublic SwaggerHandler(SwaggerResourcesProvider swaggerResources) {this.swaggerResources = swaggerResources;}@GetMapping("/swagger-resources/configuration/security")public Mono<ResponseEntity<SecurityConfiguration>> securityConfiguration() {return Mono.just(new ResponseEntity<>(Optional.ofNullable(securityConfiguration).orElse(SecurityConfigurationBuilder.builder().build()), HttpStatus.OK));}@GetMapping("/swagger-resources/configuration/ui")public Mono<ResponseEntity<UiConfiguration>> uiConfiguration() {return Mono.just(new ResponseEntity<>(Optional.ofNullable(uiConfiguration).orElse(UiConfigurationBuilder.builder().build()), HttpStatus.OK));}@GetMapping("/swagger-resources")public Mono<ResponseEntity> swaggerResources() {return Mono.just((new ResponseEntity<>(swaggerResources.get(), HttpStatus.OK)));}
}

import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilter;
import org.springframework.cloud.gateway.filter.factory.AbstractGatewayFilterFactory;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;/*** @author fsl* @description: SwaggerHeaderFilter* @date 2019-06-0310:47*/
@Component
public class SwaggerHeaderFilter extends AbstractGatewayFilterFactory {private static final String HEADER_NAME = "X-Forwarded-Prefix";private static final String URI = "/v2/api-docs";@Overridepublic GatewayFilter apply(Object config) {return (exchange, chain) -> {ServerHttpRequest request = exchange.getRequest();String path = request.getURI().getPath();if (!StringUtils.endsWithIgnoreCase(path,URI )) {return chain.filter(exchange);}String basePath = path.substring(0, path.lastIndexOf(URI));ServerHttpRequest newRequest = request.mutate().header(HEADER_NAME, basePath).build();ServerWebExchange newExchange = exchange.mutate().request(newRequest).build();return chain.filter(newExchange);};}
}

1.3 yaml 配置

application.yaml 主要是网关路由和跨域配置

spring:cloud:# Spring Cloud Gateway 配置项，对应 GatewayProperties 类gateway:# 路由配置项，对应 RouteDefinition 数组routes:- id: byzq-wq-api # 路由的编号uri: lb://byzq-wq # 根据服务名找predicates:- Path=/byzq-wq/** # 映射到对应路径filters:- StripPrefix=1 # 删除第一个路径段 /byzq-wq/api -> /api- id: byzq-yc-api # 路由的编号uri: lb://byzq-ycpredicates:- Path=/byzq-yc/**filters:- StripPrefix=1# 全局跨域配置globalcors:cors-configurations: # 跨域配置列表'[/**]': # 匹配所有路径allowed-headers: "*" # 允许的请求头，*表示允许所有allowed-methods: # 允许的请求方法列表- GET- POST- PUT- DELETE- OPTIONSallowed-origins: "*" # 允许的请求来源，*表示允许所有exposed-headers: # 暴露的响应头列表- Authorization- Content-Typeallow-credentials: true # 是否允许凭证传递，true表示允许

bootstrap.yaml 主要是nacos配置

注： nacos服务必须配置到bootstrap.yaml 里面才能被正确加载，因为执行顺序：bootstrap.yaml > ApplicationContext > application.yaml

server:port: 9999# 需要在ApplicationContext创建之前加载配置文件
spring:application:name: byzq-gatewaycloud:nacos:# nacos 服务注册discovery:server-addr: 127.0.0.1:8848namespace: byzq-local # 命名空间# nacos 配置中心config:server-addr: 127.0.0.1:8848namespace: byzq-local # 命名空间group: DEFAULT_GROUP # 使用的 nacos 配置分组，默认为 DEFAULT_GROUPfile-extension: yaml # 使用的 nacos 配置集的 dataId 的文件拓展名，默认为 properties

2、其他服务配置

2.1 pom 配置

<!-- nacos 配置和注册中心 -->
<dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
</dependency>
<dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
</dependency><!-- springboot -->
<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId>
</dependency><!-- Swagger 2 -->
<dependency><groupId>com.github.xiaoymin</groupId><artifactId>knife4j-micro-spring-boot-starter</artifactId>
</dependency>

2.2 配置文件

import org.springframework.beans.factory.annotation.Value;
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.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2;@Configuration
@EnableSwagger2
public class SwaggerConfig {@Value("${swagger.enable}")private Boolean enable;@Beanpublic Docket api() {return new Docket(DocumentationType.SWAGGER_2).enable(enable).apiInfo(apiInfo()).select()//.apis(RequestHandlerSelectors.withMethodAnnotation(ApiOperation.class)).apis(RequestHandlerSelectors.basePackage("org.example.controller")) // 替换为你的controller包路径.paths(PathSelectors.any()).build();}private ApiInfo apiInfo() {return new ApiInfoBuilder().title("巴渝制气-扬尘") // API文档标题.description("巴渝制气-扬尘接口文档") // API文档描述.version("1.0") // API版本//.contact(new Contact("Your Name", "http://www.yourcompany.com/contact", "your.email@example.com")) // 维护者信息//.termsOfServiceUrl("http://www.yourcompany.com/terms") // 服务条款URL.license("Apache 2.0") // 许可证.licenseUrl("http://www.apache.org/licenses/LICENSE-2.0.html") // 许可证URL.build();}}

2.3 yaml 配置

bootstrap.yaml 配置如下

spring:application:name: byzq-yc# 需要在ApplicationContext创建之前加载配置文件cloud:nacos:# nacos 服务注册discovery:server-addr: 127.0.0.1:8848namespace: byzq-local # 命名空间# nacos 配置中心config:server-addr: 127.0.0.1:8848namespace: byzq-local # 命名空间group: DEFAULT_GROUP # 使用的 nacos 配置分组，默认为 DEFAULT_GROUPfile-extension: yaml # 使用的 nacos 配置集的 dataId 的文件拓展名，默认为 propertiesserver:port: 8082# 关闭swagger设置为false
swagger:enable: true

3、界面访问

启动服务访问 http://localhost:9999/doc.html 应该是能正常访问的。

如果你需要一套关于gateway+nacos+knife4j的项目可以看看的源码 https://gitee.com/sheng-wanping/spring-boot-gateway 里面还包括了 API网关权限校验、用户接口权限、单点登录，（因为公司要求轻量级因此没有引入spring security 和 jwt）如果觉得有帮到你的话可以帮忙点个 star，感谢！有什么疑问可以评论区留言或者私信。

4、其他

SpringBoot 集成 Nacos