gateway 集成 swagger 的详细教程

pom

gateway项目的依赖

本着依赖整洁的原则，我加的是这些：

	
	<dependency>
	    <groupId>com.spring4allgroupId>
	    <artifactId>swagger-spring-boot-starterartifactId>
	    <version>1.9.1.RELEASEversion>
	dependency>
	
	
	<dependency>
		<groupId>com.alibaba.cloudgroupId>
		<artifactId>spring-cloud-starter-alibaba-nacos-discoveryartifactId>
	dependency>
	
	
     <dependency>
         <groupId>org.springframework.cloudgroupId>
         <artifactId>spring-cloud-starter-gatewayartifactId>
     dependency>

被代理的服务需要的操作：

在启动类上加上 @EnableSwagger2 这个注解

然后也引入下边的依赖：

	
	<dependency>
	    <groupId>com.spring4allgroupId>
	    <artifactId>swagger-spring-boot-starterartifactId>
	    <version>1.9.1.RELEASEversion>
	dependency>

配置类

这里是重头戏，一共有三个配置类

/**
 * @introduce: Swagger处理器
 * @author: lk
 * @date: 2020/6/4
 **/
@RestController
@RequestMapping("/swagger-resources")
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("/configuration/security")
    public Mono<ResponseEntity<SecurityConfiguration>> securityConfiguration() {
        return Mono.just(new ResponseEntity<>(
                Optional.ofNullable(securityConfiguration).orElse(SecurityConfigurationBuilder.builder().build()), HttpStatus.OK));
    }

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

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

/**
 * @introduce: swagger请求头过滤器
 * @author: lk
 * @date: 2020/6/4
 **/
@Component
public class SwaggerHeaderFilter extends AbstractGatewayFilterFactory {

    private static final String HEADER_NAME = "X-Forwarded-Prefix";

    @Override
    public GatewayFilter apply(Object config) {
        return (exchange, chain) -> {
            ServerHttpRequest request = exchange.getRequest();
            String path = request.getURI().getPath();
            if (!StringUtils.endsWithIgnoreCase(path, SwaggerProvider.API_URI)) {
                return chain.filter(exchange);
            }
            String basePath = path.substring(0, path.lastIndexOf(SwaggerProvider.API_URI));
            ServerHttpRequest newRequest = request.mutate().header(HEADER_NAME, basePath).build();
            ServerWebExchange newExchange = exchange.mutate().request(newRequest).build();
            return chain.filter(newExchange);
        };
    }
}

/**
 * @introduce: SwaggerProvider
 * @author: lk
 * @date: 2020/6/4
 **/
@Component
@Primary
@AllArgsConstructor
public class SwaggerProvider implements SwaggerResourcesProvider {

    public static final String API_URI = "/v2/api-docs";
    private final RouteLocator routeLocator;
    private final GatewayProperties gatewayProperties;


    @Override
    public List<SwaggerResource> get() {
        List<SwaggerResource> resources = new ArrayList<>();
        List<String> routes = new ArrayList<>();
        //取出gateway的route
        routeLocator.getRoutes().subscribe(route -> routes.add(route.getId()));
        //结合配置的route-路径(Path)，和route过滤，只获取有效的route节点
        gatewayProperties.getRoutes().stream().filter(routeDefinition -> routes.contains(routeDefinition.getId()))
                .forEach(routeDefinition -> routeDefinition.getPredicates().stream()
                        .filter(predicateDefinition -> ("Path").equalsIgnoreCase(predicateDefinition.getName()))
                        .forEach(predicateDefinition -> resources.add(swaggerResource(routeDefinition.getId(),
                                "/"+routeDefinition.getId()+API_URI ))));
        return resources;
    }
    private SwaggerResource swaggerResource(String name, String location) {
        SwaggerResource swaggerResource = new SwaggerResource();
        swaggerResource.setName(name);
        swaggerResource.setLocation(location);
        swaggerResource.setSwaggerVersion("2.0");
        return swaggerResource;

    }
}

yml

spring:
  application:
    name: gateway # 服务名称
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848 # 注册中心地址  # 默认是没有密码的
    gateway:
      discovery:
        locator:
          enabled: true  #表明gateway开启服务注册和发现的功能， 动态路由
          lowerCaseServiceId: true
          filters:
      routes:
        - id: test # 唯一id ，随便起，不能重复
          uri: lb://test # 匹配注册中心的服务
          predicates:
            - Path=/test/** # 匹配的规则
          filters:
            # 去掉路由前缀，访问 localhost：8088/test/v2/api 转发的就是 localhost:8089/v2/api
            # 1 : 代表剥离路径的个数
            - StripPrefix=1

特别注意：

filters:
-StripPrefix=1

这个一定不要去掉，不然你就访问不到你服务的swagger，如下图

结果

这样配置一下以后，就可以成功的通过 gateway 的地址访问 各个微服务的swagger了，如下图：

巨人的肩膀：
1、全网首例Spring Cloud Gateway整合Swagger2 Demo
2、springcloud-gateway网关聚合swagger实现多个服务接口切换
3、spring cloud gateway聚合swagger的方法记录

看似简单，实则鼓捣了半天，亲测没问题，如果大家遇到了什么问题，欢迎评论提出，我们一起讨论！