SpringCloudAlibaba整合服务网关GateWay教程

 <!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-gateway -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-gateway</artifactId>
            <version>2.2.0.RELEASE</version>
        </dependency>

server:
  port: 80
####服务网关名称
spring:
  application:
    name: springcloudalibaba-gateway
  cloud:
    gateway:
      discovery:
        locator:
          ####开启以服务id去注册中心上获取转发地址
          enabled: true
        ###路由策略
      routes:
        ##路由id
        - id: producer
          #### 基于lb负载均衡形式转发（通过注册中心服务名称，获取真实访问地址）
          uri: lb://springcloudalibaba-producer
          filters:
            - StripPrefix=1
          ###匹配规则
          predicates:
            - Path=/producer/**
    nacos:
      discovery:
        server-addr: nacosIp地址:8848
        ### 127.0.0.1/producer/***  转发到http://127.0.0.1:8080/***

@Component
public class TokenFilter implements GlobalFilter {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        String token = exchange.getRequest().getQueryParams().getFirst("token");
        if(token==null||token.isEmpty()){
            ServerHttpResponse response = exchange.getResponse();
            response.setStatusCode(HttpStatus.BAD_GATEWAY);
            String msg = "token not is null";
            DataBuffer buffer = response.bufferFactory().wrap(msg.getBytes());
            return response.writeWith(Mono.just(buffer));
        }
        return chain.filter(exchange);
    }
}