1 pom.xml中引入依赖,最新GA版本

    <dependency>      <groupId>org.springframework.cloud</groupId>      <artifactId>spring-cloud-starter-gateway</artifactId>      <version>3.1.0</version>    </dependency>

2 启动类

@SpringBootApplicationpublic class DemoApplication {    @Bean    public RouteLocator customRouteLocator(RouteLocatorBuilder builder) {        return builder.routes().route("routeA", r -> r.path("/pathA")        .uri("http://www.a.com")).build();    }    public static void main(String[] args) {        System.setProperty("reactor.netty.ioWorkerCount", "n");        SpringApplication.run(DemoApplication.class, args);    }}

3 yaml

server:    port: 80logging:    level:        org.springframework.cloud.gateway: INFO        org.springframework.http.server.reactive: INFO        org.springframework.web.reactive: INFO        reactor.ipc.netty: INFO        reactor.netty: INFOspring:    cloud:        gateway:            routes:                - id: routeB                  uri: http://www.b.com                  predicates:                      - Path=/pathB

4 启动
这样启动后具备一个最简略的工程能力，外面具备两条动态路由性能：
pathA 转发至 www.a.com
pathB 转发至 www.b.com

5 动静路由
需路实现该接口：

package org.springframework.cloud.gateway.route;public interface RouteDefinitionRepository extends RouteDefinitionLocator, RouteDefinitionWriter {}

接下来来一个简略的小例子看一下：

@Componentpublic class DemoRouteDefinitionRepository implements RouteDefinitionRepository {    private int idx = 1;    @Override    public Flux<RouteDefinition> getRouteDefinitions() {        System.out.println("===========执行getRouteDefinitions");        RouteDefinition definition = new RouteDefinition();        definition.setId("routeC");        if (idx++ % 2 == 0) {            definition.setUri(URI.create("http://www.c1.com"));        } else {            definition.setUri(URI.create("http://www.c2.com"));        }        PredicateDefinition predicate = new PredicateDefinition();        predicate.setName("Path");        Map<String, String> map = new HashMap<>();        map.put("pattern", "/pathC");        predicate.setArgs(map);        definition.setPredicates(Arrays.asList(predicate));        return Flux.fromIterable(Arrays.asList(definition));    }    @Override    public Mono<Void> save(Mono<RouteDefinition> route) {        return null;    }    @Override    public Mono<Void> delete(Mono<String> routeId) {        return null;    }}

能够看到getRouteDefinitions()提供路由信息，启动的时候会读取一次。在这里为模仿一下动静的情景，须要有事件去触发调用getRouteDefinitions()来更新路由，触发的动作是发送一个RefreshRoutesEvent事件：

@RestControllerpublic class HomeController implements ApplicationEventPublisherAware{    private ApplicationEventPublisher publisher;    @GetMapping("/change")    public Mono<Void> msg() {        publisher.publishEvent(new RefreshRoutesEvent(this));        return Mono.empty();    }    @Override    public void setApplicationEventPublisher(ApplicationEventPublisher applicationEventPublisher) {        this.publisher = applicationEventPublisher;    }}

每调用一次/change，路由信息会变动一次，当然，也能够减少一条或者删除一条路由信息，本例子中save、delete都未实现。