Eureka服务搭建

1️⃣搭建服务

引入依赖

xml 复制代码

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

启动类加注解

java 复制代码

@EnableEurekaServer
@SpringBootApplication
public class EurekaApplication {

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

改配置

yml 复制代码

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

引入依赖

xml 复制代码

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

修改配置

yml 复制代码

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

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

java 复制代码

@MapperScan("cn.zyw.order.mapper")
@SpringBootApplication
public class OrderApplication {

    public static void main(String[] args) {
        SpringApplication.run(OrderApplication.class, args);
    }
    
    @Bean
    @LoadBalanced
    public RestTemplate getRestTemplate(){
        return new RestTemplate();
    }
}

4️⃣负载均衡策略

代码方式: 定义一个新的IRule:

java 复制代码

	@Bean
    public IRule randomRule(){
        return new RandomRule();
    }

配置文件方式:在application.yml文件中

yml 复制代码

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

yml 复制代码

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