1️⃣搭建服务

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引入依赖

		<dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-netflix-eureka-server</artifactId></dependency>

启动类加注解

@EnableEurekaServer
@SpringBootApplication
public class EurekaApplication {public static void main(String[] args) {SpringApplication.run(EurekaApplication.class,args);}
}

改配置

server:port: 10086
spring:application:name: eurekaserver   # eureka服务名称
eureka:client:service-url:              # eureka服务地址defaultZone: http://127.0.0.1:10086/eureka      

2️⃣服务注册

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引入依赖

		<dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-netflix-eureka-client</artifactId></dependency>

修改配置

spring:application:name: userservice
eureka:client:service-url:defaultZone: http://127.0.0.1:10086/eureka

3️⃣服务发现和负载均衡

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• 服务发现

将请求url中的ip端口换成服务名 如 userservice
http://userservice/user/1001

• 负载均衡

在RestTemplate添加@LoadBalanced注解

@MapperScan("cn.zyw.order.mapper")
@SpringBootApplication
public class OrderApplication {public static void main(String[] args) {SpringApplication.run(OrderApplication.class, args);}@Bean@LoadBalancedpublic RestTemplate getRestTemplate(){return new RestTemplate();}
}

4️⃣负载均衡策略

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• 代码方式: 定义一个新的IRule:

	@Beanpublic IRule randomRule(){return new RandomRule();}

• 配置文件方式:在application.yml文件中

userservice: # 要配置的微服务名称ribbon:NFLoadBalancerRuleClassName: com.netflix.loadbalancer.RandomRule   # 负载均衡规则

5️⃣饥饿加载

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ribbon:eager-load:enabled: true # 开启饥饿加载clients:      # 指定饥饿加载的服务名称- userservice