1.RestTemplate负载均衡注解

    @Bean
    @LoadBalanced
    public RestTemplate restTemplate(RestTemplateBuilder builder){
        return builder.build();
    }

这个注解需要maven单独添加依赖

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

2.设置负载均衡算法

        默认是轮询

        设置为随机请求

        1.在@ComponentScan扫描范围外添加新的配置类

@Configurable
public class RibbonRoundomRuleConfig {
    @Bean
    /*
    * 方法名一定要和类名一致
    *
    * 这个类不用放在ComponentScanner的目录中
    * 否则回被其他的服务提供者共享规则
    *
    * spring cloud 2022.0舍弃Ribbon后的写法
    * */
    public ReactorLoadBalancer<ServiceInstance> reactorLoadBalancer(
            Environment environment,
            LoadBalancerClientFactory loadBalancerClientFactory
    ){
        String name=environment.getProperty(LoadBalancerClientFactory.PROPERTY_NAME);
        return new RandomLoadBalancer(
                loadBalancerClientFactory.getLazyProvider(
                        name,
                        ServiceInstanceListSupplier.class
                ),
                name
        );
    }
}

2.在启动类中添加配置

@SpringBootApplication
@LoadBalancerClients(defaultConfiguration = RibbonRoundomRuleConfig.class)
public class Order0Application {
    public static void main(String[] args) {
        SpringApplication.run(Order0Application.class,args);
    }
    @Bean
    @LoadBalanced
    public RestTemplate restTemplate(RestTemplateBuilder builder){
        return builder.build();
    }
}

3.重启测试