SpringCloud Ribbon初步配置

Spring Cloud Ribbon是一个基于HTTP和TCP的客户端负载均衡工具，它基于Netflix Ribbon实现。通过Spring Cloud的封装，可以让我们轻松地将面向服务的REST模版请求自动转换成客户端负载均衡的服务调用。

本章基于SpringCloud集群配置案例来进行Ribbon初步配置

步骤一：

修改consumer消费者80端口，添加ribbon依赖

<!-- Ribbon相关 -->
	<dependency>
		<groupId>org.springframework.cloud</groupId>
		<artifactId>spring-cloud-starter-eureka</artifactId>
	</dependency>
	<dependency>
		<groupId>org.springframework.cloud</groupId>
		<artifactId>spring-cloud-starter-ribbon</artifactId>
	</dependency>
	<dependency>
		<groupId>org.springframework.cloud</groupId>
		<artifactId>spring-cloud-starter-config</artifactId>
	</dependency>

步骤二：

修改application.yml客户端集群配置

server:
  port: 80
  
eureka:
  client:
    register-with-eureka: false
    service-url: 
      defaultZone: http://eureka7001:7001/eureka/,http://eureka7002:7002/eureka/,http://eureka7003:7003/eureka/

步骤三：

在配置类注入的RestTemplate上添加注解@LoadBalance

package com.gcxzflgl.springCloud.confBean;

import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;


@Configuration
public class ConfigBean { 
	
	@Bean
	@LoadBalanced
	public RestTemplate getRestTemplate(){
		return new RestTemplate();
	}
}

步骤四：修改主类添加@EnableEurekaClient

package com.gcxzflgl.springCloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@SpringBootApplication
@EnableEurekaClient
public class DeptConsumer80_App
{
	public static void main(String[] args)
	{
		SpringApplication.run(DeptConsumer80_App.class, args);
	}
}

步骤五：

DeptController_Consumer通过注册到Eureka服务名来提供服务

//	private static final String REST_URL_PREFIX = "http://localhost:8001";
	private static final String REST_URL_PREFIX = "http://MICROSERVICECLOUD-DEPT";

步骤六：启动三个Eureka服务，提供者，消费者服务，看到这个结果代表配置成功

Ribbon和Eureka整合后可以直接调用服务不用在关心地址和端口！

SpringCloud Ribbon初步配置

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