SpringCloud（12）：LoadBalance：自定义负载均衡算法
一、切换随机负载均衡
查看源码可以看到ReactiveLoadBalancer接口下有两个实现。随机和轮询。![20210126185021611.png][]
（1）切换RandomLoadBalancer，编写配置类：
package com.buba.loadbalancer;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;/*** 客户端负载均衡配置*/public class CustomLoadBalancerConfiguration {@BeanReactorLoadBalancer<ServiceInstance> randomLoadBalancer(Environment environment,LoadBalancerClientFactory loadBalancerClientFactory) {String name = environment.getProperty(LoadBalancerClientFactory.PROPERTY_NAME);return new RandomLoadBalancer(loadBalancerClientFactory.getLazyProvider(name, ServiceInstanceListSupplier.class),name);}}
（2）@LoadBalancerClients注解设置默认配置文件
package com.buba.springcloud.config;import com.buba.loadbalancer.CustomLoadBalancerConfiguration;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;/*** @Configuration 相当于applicationContext.xml*/@Configuration@LoadBalancerClients(defaultConfiguration = {CustomLoadBalancerConfiguration.class})public class ConfigBean {/*** @return* @LoadBalanced 配置负载均衡到RestTemplate* 把RestTemplate对象交给Spring管理*/@Bean@LoadBalancedpublic RestTemplate getRestTemplate() {return new RestTemplate();}}
（3）启动测试
重复访问[http://localhost/consumer/dept/list][http_localhost_consumer_dept_list]，可以看到数据随机从某个服务提供者中获取：
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迷南。
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