Gateway网关，通过检查请求地址匹配相应的服务请求，访问时直接请求网关的请求地址，会转发到相应的服务;可通过yml文件配置或者代码配置

pom:

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

gateway的yml配置:

spring:
  application:
    name: cloud-gateway
  cloud:
    gateway:
      discovery:
        locator:
          enabled: true # 开启从注册中心动态创建路由的功能，利用微服务名称j进行路由
      routes:
        - id: payment_route # 路由的id,没有规定规则但要求唯一,建议配合服务名
          #匹配后提供服务的路由地址
#          uri: http://localhost:8001 固定地址
          uri: lb://cloud-payment-service # 服务名
          predicates:
            # 过滤
            - Path=/payment/get/** # 断言，路径相匹配的进行路由
            - After=2021-11-01T10:01:53.212+08:00[Asia/Shanghai]
            #- Before=2017-01-20T17:42:47.789-07:00[America/Denver]
            #- Cookie=username,zzyy
            #- Header=X-Request-Id, \d+ #请求头要有X-Request-Id属性，并且值为正数
            #- Host=**.atguigu.com
            #- Method=GET
            #- Query=username, \d+ # 要有参数名username并且值还要是正整数才能路由
          # 过滤
          #filters:
          #  - AddRequestHeader=X-Request-red, blue
        - id: payment_route2
          uri: lb://cloud-payment-service
          predicates:
            Path=/payment/lb/** #断言,路径相匹配的进行路由

代码文件指定转发的接口（代码配置）

package com.atguigu.springcloud.config;

import org.springframework.cloud.gateway.route.RouteLocator;
import org.springframework.cloud.gateway.route.builder.RouteLocatorBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class GatewayConfig {
    @Bean
    public RouteLocator customRouteLocator(RouteLocatorBuilder routeLocatorBuilder){
        RouteLocatorBuilder.Builder routers = routeLocatorBuilder.routes();

        routers.route("path_route_atguigu",
                r ->r.path("/guonei")
                        .uri("http://news.baidu.com/guonei")).build();
        return routers.build();
    }
}

配置过滤条件

package com.atguigu.springcloud.config.filter;

import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.Date;

@Component
@Slf4j
public class MyLogGateWayFilter implements GlobalFilter, Ordered {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        log.info("********MyLogGateWayFilter"+new Date());
        String uname = exchange.getRequest().getQueryParams().getFirst("uname");
        if(uname == null){
            log.info("非法用户");
            exchange.getResponse().setStatusCode(HttpStatus.NOT_ACCEPTABLE);
            return exchange.getResponse().setComplete();
        }
        return chain.filter(exchange);
    }

    @Override
    public int getOrder() {
        return 0;
    }
}