POM依赖

 <parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.7.10</version><relativePath/></parent><properties><maven.compiler.source>8</maven.compiler.source><maven.compiler.target>8</maven.compiler.target><springcloud.version>3.1.6</springcloud.version><springcloudalibaba.version>2021.0.4.0</springcloudalibaba.version><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId><version>${springcloudalibaba.version}</version><exclusions><exclusion><!-- nacos-client2.0.4版本存在官方github上的#6999及#10385号Bug； nacos-client2.2.1版本存在当配置中心配置变化后客户端AsyncAppender进程数不断增加Bug --><groupId>com.alibaba.nacos</groupId><artifactId>nacos-client</artifactId></exclusion></exclusions></dependency><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId><version>${springcloudalibaba.version}</version><exclusions><exclusion><!-- nacos-client2.0.4版本存在官方github上的#6999及#10385号Bug； nacos-client2.2.1版本存在当配置中心配置变化后客户端AsyncAppender进程数不断增加Bug --><groupId>com.alibaba.nacos</groupId><artifactId>nacos-client</artifactId></exclusion></exclusions></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-bootstrap</artifactId><version>${springcloud.version}</version></dependency><dependency><groupId>com.alibaba.nacos</groupId><artifactId>nacos-client</artifactId><version>2.1.1</version></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-openfeign</artifactId><version>${springcloud.version}</version></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-loadbalancer</artifactId><version>${springcloud.version}</version></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-netflix-hystrix</artifactId><version>2.2.9.RELEASE</version></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-gateway</artifactId><version>3.1.5</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId><exclusions><exclusion><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId></exclusion><exclusion><artifactId>spring-boot-starter-tomcat</artifactId><groupId>org.springframework.boot</groupId></exclusion></exclusions></dependency></dependencies>

环境准备

nacos搭建Nacos standalone单机搭建部署

配置

配置文件

application.yml

server:port: 8082
spring:profiles:active: devmain:web-application-type: reactiveapplication:name: api-gatewaycloud:gateway:routes:- id: Mesuri: lb://Mespredicates:- Path=/mes/**- id: Testuri: lb://Testpredicates:- Path=/test/**

bootstrap.properties

spring.cloud.nacos.discovery.server-addr=localhost:8848
spring.cloud.nacos.discovery.group=dev
spring.cloud.nacos.discovery.namespace=1e6d33e2-5f43-45ec-8c1b-9c883c2c71d9
spring.cloud.nacos.config.group=dev
spring.cloud.nacos.config.prefix=gateway
spring.cloud.nacos.config.server-addr=localhost:8848
spring.cloud.nacos.config.file-extension=properties
spring.cloud.nacos.config.namespace=1e6d33e2-5f43-45ec-8c1b-9c883c2c71d9
spring.profiles.active=dev
spring.cloud.gateway.globalcors.corsConfigurations.[/**].allowedOriginPatterns=*
spring.cloud.gateway.globalcors.corsConfigurations.[/**].allowedHeaders=*
spring.cloud.gateway.globalcors.corsConfigurations.[/**].allowedMethods=*
spring.cloud.gateway.globalcors.corsConfigurations.[/**].allowCredentials=true

bootstrap-dev.properties

# 用于配置中心测试
message.name=lisi

配置类

自定义Gateway负载均衡器，采用nacos所配置的权重进行负载均衡调用，随机权重算法

import com.alibaba.cloud.nacos.balancer.NacosBalancer;
import com.alibaba.nacos.api.naming.pojo.Instance;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.factory.ObjectProvider;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.loadbalancer.DefaultResponse;
import org.springframework.cloud.client.loadbalancer.EmptyResponse;
import org.springframework.cloud.client.loadbalancer.Request;
import org.springframework.cloud.client.loadbalancer.Response;
import org.springframework.cloud.loadbalancer.core.*;
import reactor.core.publisher.Mono;import java.math.BigDecimal;
import java.util.List;
import java.util.Map;
import java.util.Random;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Collectors;public class CustomRoundRobinLoadBalancer implements ReactorServiceInstanceLoadBalancer {private static final Log log = LogFactory.getLog(RoundRobinLoadBalancer.class);final AtomicInteger position;final String serviceId;ObjectProvider<ServiceInstanceListSupplier> serviceInstanceListSupplierProvider;/*** @param serviceInstanceListSupplierProvider a provider of*                                            {@link ServiceInstanceListSupplier} that will be used to get available instances* @param serviceId                           id of the service for which to choose an instance*/public CustomRoundRobinLoadBalancer(ObjectProvider<ServiceInstanceListSupplier> serviceInstanceListSupplierProvider, String serviceId) {this(serviceInstanceListSupplierProvider, serviceId, new Random().nextInt(1000));}/*** @param serviceInstanceListSupplierProvider a provider of*                                            {@link ServiceInstanceListSupplier} that will be used to get available instances* @param serviceId                           id of the service for which to choose an instance* @param seedPosition                        Round Robin element position marker*/public CustomRoundRobinLoadBalancer(ObjectProvider<ServiceInstanceListSupplier> serviceInstanceListSupplierProvider, String serviceId, int seedPosition) {this.serviceId = serviceId;this.serviceInstanceListSupplierProvider = serviceInstanceListSupplierProvider;this.position = new AtomicInteger(seedPosition);}@SuppressWarnings("rawtypes")@Overridepublic Mono<Response<ServiceInstance>> choose(Request request) {ServiceInstanceListSupplier supplier = serviceInstanceListSupplierProvider.getIfAvailable(NoopServiceInstanceListSupplier::new);return supplier.get(request).next().map(serviceInstances -> processInstanceResponse(supplier, serviceInstances));}private Response<ServiceInstance> processInstanceResponse(ServiceInstanceListSupplier supplier, List<ServiceInstance> serviceInstances) {Response<ServiceInstance> serviceInstanceResponse = getInstanceResponse(serviceInstances);if (supplier instanceof SelectedInstanceCallback && serviceInstanceResponse.hasServer()) {((SelectedInstanceCallback) supplier).selectedServiceInstance(serviceInstanceResponse.getServer());}return serviceInstanceResponse;}/*** 按nacos权重** @return*/private Response<ServiceInstance> getInstanceResponse(List<ServiceInstance> serviceInstances) {Map<String, List<ServiceInstance>> collect = serviceInstances.stream().collect(Collectors.groupingBy(g -> {//nacos在2.0版本之后移除了对实例id查询
//            return g.getMetadata().get("nacos.instanceId");return g.getHost() +":"+ g.getPort();}));if (serviceInstances.isEmpty()) {if (log.isWarnEnabled()) {log.warn("No servers available for service: " + serviceId);}return new EmptyResponse();}List<Instance> instances = serviceInstances.stream().map(i -> {Instance instance = new Instance();instance.setInstanceId(i.getInstanceId());Map<String, String> metadata = i.getMetadata();instance.setInstanceId(metadata.get("nacos.instanceId"));instance.setWeight(new BigDecimal(metadata.get("nacos.weight")).doubleValue());instance.setClusterName(metadata.get("nacos.cluster"));instance.setEphemeral(Boolean.parseBoolean(metadata.get("nacos.ephemeral")));instance.setHealthy(Boolean.parseBoolean(metadata.get("nacos.healthy")));instance.setPort(i.getPort());instance.setIp(i.getHost());instance.setServiceName(i.getServiceId());instance.setMetadata(metadata);return instance;}).collect(Collectors.toList());//采用nacos所配置的权重进行负载均衡调用，随机权重算法Instance instance = NacosBalancer.getHostByRandomWeight2(instances);
//        // TODO: enforce order?
//        int pos = Math.abs(this.position.incrementAndGet());
//        ServiceInstance instance = instances.get(pos % instances.size());return new DefaultResponse(collect.get(instance.getIp()+":"+ instance.getPort()).stream().findFirst().get());}
}

负载均衡配置类，指定使用哪一个负载均衡器

import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.loadbalancer.core.ReactorLoadBalancer;
import org.springframework.cloud.loadbalancer.core.ServiceInstanceListSupplier;
import org.springframework.cloud.loadbalancer.support.LoadBalancerClientFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.env.Environment;
@Configuration
public class RoundRobinLoadBalancerConfig {@BeanReactorLoadBalancer<ServiceInstance> randomLoadBalancer(Environment environment, LoadBalancerClientFactory loadBalancerClientFactory) {String name = environment.getProperty(LoadBalancerClientFactory.PROPERTY_NAME);return new CustomRoundRobinLoadBalancer(loadBalancerClientFactory.getLazyProvider(name, ServiceInstanceListSupplier.class), name);}
}

LoadBalancerClient,负载均衡调用客户端，指定负载均衡器配置类，LoadBalancerClient注解中value要对用配置文件中路由的id

import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.cloud.loadbalancer.annotation.LoadBalancerClient;
import org.springframework.cloud.loadbalancer.annotation.LoadBalancerClients;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;
@LoadBalancerClients({@LoadBalancerClient(value = "Mes", configuration = RoundRobinLoadBalancerConfig.class), @LoadBalancerClient(value = "Test", configuration = RoundRobinLoadBalancerConfig.class)})
@Configuration
public class RestTemplateConfig {@LoadBalanced@Beanpublic RestTemplate restTemplate() {return new RestTemplate();}
}

全局过滤器

import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.cloud.gateway.support.ServerWebExchangeUtils;
import org.springframework.core.Ordered;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;import java.net.URI;@Slf4j
@Component
public class RouteRecordGlobalFilter implements GlobalFilter, Ordered {@Overridepublic Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {URI proxyRequestUri = exchange.getAttribute(ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR);long start = System.currentTimeMillis();return chain.filter(exchange).then(Mono.fromRunnable(() -> {long end = System.currentTimeMillis();log.info("实际调用地址为：{}，调用耗时为：{}ms", proxyRequestUri, (end - start));}));}@Overridepublic int getOrder() {// 优先级设为最低，先让RouteToRequestUrlFilter先调用return Ordered.LOWEST_PRECEDENCE;}
}

案例展示

Nacos服务列表

服务权重配置

服务测试代码

负载效果

配置中心测试代码

本地配置项

配置中心配置

效果

配置中心注意：
这三个配置的拼接等于配置中心的配置 Data ID一定要正确

spring.cloud.nacos.config.prefix=gateway
spring.cloud.nacos.config.file-extension=properties
spring.profiles.active=dev