如何使用spring gateway微服务网关(基本用法)

<dependency>
   <groupId>org.springframework.cloud</groupId>
   <artifactId>spring-cloud-starter-gateway</artifactId>
   <version>3.0.1</version>
</dependency>

server:
  port: 9080
spring:
  application:
    name: gateway-sample
  cloud:
    gateway:
      discovery:
        locator:
          enabled: true
      routes:
        - id: gateway-02
          uri: http://localhost:9081          #匹配后提供服务的路由地址
          predicates:
            - Path=/sample/service1/say/**         # 断言，路径相匹配的进行路由
          filters:
            - StripPrefix=2

@RestController
@RequestMapping("/say")
public class SomethingToSay {
    @GetMapping("/hello")
    public String sayHello() {
        return "hello";
    }
    @GetMapping("/hi")
    public String sayHi() {
        return "hi";
    }
    @GetMapping("/ohh")
    public String sayOhh() {
        return "ohh";
    }
}

@Component
public class MyGlobalFilter implements GlobalFilter, Ordered {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        System.out.println("服务调用请求：" + exchange.getRequest().getURI());
        return chain.filter(exchange).then(Mono.fromRunnable(() ->
                System.out.println("服务调用返回了，" + exchange.getResponse().getStatusCode())));
    }
    @Override
    public int getOrder() {
        return 0;
    }
}