淮安网站设计公司,网站从哪里找的,建设网站合同,wap建站系统开源2020年前SpringCloud是采用Ribbon作为负载均衡实现#xff0c;但是在2020后采用了LoadBalancer替代 LoadBalancer默认提供了两种负载均衡策略#xff08;只能通过配置类来修改负载均衡策略#xff09; 1.RandomLoadBalancer-随机分配策略 2.RoundRobinLoadBalancer-轮询分配… 2020年前SpringCloud是采用Ribbon作为负载均衡实现但是在2020后采用了LoadBalancer替代 LoadBalancer默认提供了两种负载均衡策略只能通过配置类来修改负载均衡策略 1.RandomLoadBalancer-随机分配策略 2.RoundRobinLoadBalancer-轮询分配策略(默认) 添加一个自定义的负载均衡策略CustomLoadBalancerConfiguration 配置类可以直接复制官网
package com.test.order.config;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.loadbalancer.core.RandomLoadBalancer;
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.core.env.Environment;public class CustomLoadBalancerConfiguration {BeanReactorLoadBalancerServiceInstance randomLoadBalancer(Environment environment,LoadBalancerClientFactory loadBalancerClientFactory) {String name environment.getProperty(LoadBalancerClientFactory.PROPERTY_NAME);return new RandomLoadBalancer(loadBalancerClientFactory.getLazyProvider(name, ServiceInstanceListSupplier.class),name);}
}注意如果负载均衡策略配置类使用spring注解ComponentScan或者Configuration就要注意如果被SpringBootApplication的ComponentScan扫描到(默认扫描SpringBootApplication目录下的全部包)就会变成全局的负载均衡策略如果需要局部负载均衡最好不用注解或者设置不被默认的ComponentScan扫描到
在启动类配置那个微服务使用那种负载均衡策略如果有Ribbon负载均衡需要在yml负载均衡去掉一般在2020版本后无需配置去掉因为默认没有Ribbon
SpringBootApplication
//LoadBalancerClients(defaultConfiguration{CustomLoadBalancerConfiguration.class})
//value的值表示需要负载均衡的微服务调用指定的负载均衡策略
//LoadBalancerClient(value stock-nacos,configuration {CustomLoadBalancerConfiguration.class})
//LoadBalancerClients({LoadBalancerClient(value stock-nacos, configuration {CustomLoadBalancerConfiguration.class}),LoadBalancerClient(value stock-nacos2, configuration {CustomLoadBalancerConfiguration2.class})})
LoadBalancerClients({LoadBalancerClient(value stock-nacos, configuration {CustomLoadBalancerConfiguration.class})})
public class OrderLoadbalancerApplication {public static void main(String[] args) {SpringApplication.run(OrderLoadbalancerApplication.class, args);}BeanLoadBalancedpublic RestTemplate restTemplate(RestTemplateBuilder builder) {RestTemplate restTemplate builder.build();return restTemplate;}
}pom.xml配置(因为spring-cloud-starter-alibaba-nacos-discovery依赖中的spring-cloud-starter-loadbalancer的true所以不会继承需要收到继承)如下 dependenciesdependencygroupIdorg.springframework.boot/groupIdartifactIdspring-boot-starter-web/artifactId/dependencydependencygroupIdorg.springframework.cloud/groupIdartifactIdspring-cloud-starter-loadbalancer/artifactId/dependencydependencygroupIdcom.alibaba.cloud/groupIdartifactIdspring-cloud-starter-alibaba-nacos-discovery/artifactId/dependency/dependencies父pom.xml配置 dependencyManagement!--Spring Cloud alibaba的版本管理通过dependency完成继承--dependenciesdependencygroupIdcom.alibaba.cloud/groupIdartifactIdspring-cloud-alibaba-dependencies/artifactIdversion2021.0.4.0/versiontypepom/typescopeimport/scope/dependencydependencygroupIdorg.springframework.cloud/groupIdartifactIdspring-cloud-dependencies/artifactIdversion2021.0.4/versiontypepom/typescopeimport/scope/dependency/dependencies/dependencyManagement遇到问题点击spring-cloud-dependencies进不去查看pom文件就是下载的pom有问题可以都删除掉org.springframework.cloud目录下的文件再重新刷新下载
版本链接对应
