一 Ribbon简介

Ribbon是Netflix发布的负载均衡器，它有助于控制HTTP和TCP的客户端的行为。为Ribbon配置服务提供者地址后，Ribbon就可基于某种负载均衡算法，自动地帮助服务消费者去请求。Ribbon默认为我们提供了很多负载均衡算法，例如轮询、随机等。当然，我们也可为Ribbon实现自定义的负载均衡算法。
在Spring Cloud中，当Ribbon与Eureka配合使用时，Ribbon可自动从Eureka Server获取服务提供者地址列表，并基于负载均衡算法，请求其中一个服务提供者实例。展示了Ribbon与Eureka配合使用时的架构。

二新建microservice-consumer-movie-ribbon项目

1 为RestTemplate添加注解@LoadBalanced

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;@EnableDiscoveryClient
@SpringBootApplication
public class ConsumerMovieApplication {@Bean@LoadBalancedpublic RestTemplate restTemplate() {return new RestTemplate();}public static void main(String[] args) {SpringApplication.run(ConsumerMovieApplication.class, args);}
}

2 修改Controller代码

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.loadbalancer.LoadBalancerClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;import com.itmuch.cloud.study.user.entity.User;@RestController
public class MovieController {private static final Logger LOGGER = LoggerFactory.getLogger(MovieController.class);@Autowiredprivate RestTemplate restTemplate;@Autowiredprivate LoadBalancerClient loadBalancerClient;@GetMapping("/user/{id}")public User findById(@PathVariable Long id) {//VIP:virtual IPreturn this.restTemplate.getForObject("http://microservice-provider-user/" + id, User.class);}@GetMapping("/log-user-instance")public void logUserInstance() {ServiceInstance serviceInstance = this.loadBalancerClient.choose("microservice-provider-user");// 打印当前选择的是哪个节点MovieController.LOGGER.info("{}:{}:{}", serviceInstance.getServiceId(), serviceInstance.getHost(), serviceInstance.getPort());}
}

3 配置文件

server:port: 8010
spring:application:name: microservice-consumer-movie
eureka:client:serviceUrl:defaultZone:http://localhost:8761/eureka/instance:prefer-ip-address: true

三测试

启动eureka微服务
启动movie-ribbon微服务
启动一个user微服务

测试结果：

4 启动另外一个user微服务方法

修改user微服务的端口如下：

server:port: 8001
spring:application:name: microservice-provider-userjpa:generate-ddl: falseshow-sql: truehibernate:ddl-auto: nonedatasource:                           # 指定数据源platform: h2                        # 指定数据源类型schema: classpath:schema.sql        # 指定h2数据库的建表脚本data: classpath:data.sql            # 指定h2数据库的数据脚本
logging:                                # 配置日志级别，让hibernate打印出执行的SQLlevel:root: INFOorg.hibernate: INFOorg.hibernate.type.descriptor.sql.BasicBinder: TRACEorg.hibernate.type.descriptor.sql.BasicExtractor: TRACE
eureka:client:healthcheck:enabled: trueserviceUrl:defaultZone:http://localhost:8761/eureka/#defaultZone: http://user:password123@localhost:8761/eureka/instance:prefer-ip-address: true

启动第2个user微服务后

5 9次访问http://localhost:8010/user/1 ，可以得出ribbon默认采用轮询的方式进行负载均衡
5次访问8000端口

2018-06-16 08:56:41.277  INFO 3396 --- [nio-8000-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring FrameworkServlet 'dispatcherServlet'
2018-06-16 08:56:41.277  INFO 3396 --- [nio-8000-exec-1] o.s.web.servlet.DispatcherServlet        : FrameworkServlet 'dispatcherServlet': initialization started
2018-06-16 08:56:41.315  INFO 3396 --- [nio-8000-exec-1] o.s.web.servlet.DispatcherServlet        : FrameworkServlet 'dispatcherServlet': initialization completed in 38 ms
Hibernate: select user0_.id as id1_0_0_, user0_.age as age2_0_0_, user0_.balance as balance3_0_0_, user0_.name as name4_0_0_, user0_.username as username5_0_0_ from user user0_ where user0_.id=?
2018-06-16 08:56:41.439 TRACE 3396 --- [nio-8000-exec-1] o.h.type.descriptor.sql.BasicBinder      : binding parameter [1] as [BIGINT] - [1]
2018-06-16 08:56:41.454 TRACE 3396 --- [nio-8000-exec-1] o.h.type.descriptor.sql.BasicExtractor   : extracted value ([age2_0_0_] : [INTEGER]) - [20]
2018-06-16 08:56:41.455 TRACE 3396 --- [nio-8000-exec-1] o.h.type.descriptor.sql.BasicExtractor   : extracted value ([balance3_0_0_] : [NUMERIC]) - [100.00]
2018-06-16 08:56:41.455 TRACE 3396 --- [nio-8000-exec-1] o.h.type.descriptor.sql.BasicExtractor   : extracted value ([name4_0_0_] : [VARCHAR]) - [张三]
2018-06-16 08:56:41.457 TRACE 3396 --- [nio-8000-exec-1] o.h.type.descriptor.sql.BasicExtractor   : extracted value ([username5_0_0_] : [VARCHAR]) - [account1]
Hibernate: select user0_.id as id1_0_0_, user0_.age as age2_0_0_, user0_.balance as balance3_0_0_, user0_.name as name4_0_0_, user0_.username as username5_0_0_ from user user0_ where user0_.id=?
2018-06-16 08:56:49.171 TRACE 3396 --- [nio-8000-exec-2] o.h.type.descriptor.sql.BasicBinder      : binding parameter [1] as [BIGINT] - [1]
2018-06-16 08:56:49.171 TRACE 3396 --- [nio-8000-exec-2] o.h.type.descriptor.sql.BasicExtractor   : extracted value ([age2_0_0_] : [INTEGER]) - [20]
2018-06-16 08:56:49.171 TRACE 3396 --- [nio-8000-exec-2] o.h.type.descriptor.sql.BasicExtractor   : extracted value ([balance3_0_0_] : [NUMERIC]) - [100.00]
2018-06-16 08:56:49.172 TRACE 3396 --- [nio-8000-exec-2] o.h.type.descriptor.sql.BasicExtractor   : extracted value ([name4_0_0_] : [VARCHAR]) - [张三]
2018-06-16 08:56:49.172 TRACE 3396 --- [nio-8000-exec-2] o.h.type.descriptor.sql.BasicExtractor   : extracted value ([username5_0_0_] : [VARCHAR]) - [account1]
Hibernate: select user0_.id as id1_0_0_, user0_.age as age2_0_0_, user0_.balance as balance3_0_0_, user0_.name as name4_0_0_, user0_.username as username5_0_0_ from user user0_ where user0_.id=?
2018-06-16 08:56:53.448 TRACE 3396 --- [nio-8000-exec-3] o.h.type.descriptor.sql.BasicBinder      : binding parameter [1] as [BIGINT] - [1]
2018-06-16 08:56:53.448 TRACE 3396 --- [nio-8000-exec-3] o.h.type.descriptor.sql.BasicExtractor   : extracted value ([age2_0_0_] : [INTEGER]) - [20]
2018-06-16 08:56:53.448 TRACE 3396 --- [nio-8000-exec-3] o.h.type.descriptor.sql.BasicExtractor   : extracted value ([balance3_0_0_] : [NUMERIC]) - [100.00]
2018-06-16 08:56:53.448 TRACE 3396 --- [nio-8000-exec-3] o.h.type.descriptor.sql.BasicExtractor   : extracted value ([name4_0_0_] : [VARCHAR]) - [张三]
2018-06-16 08:56:53.449 TRACE 3396 --- [nio-8000-exec-3] o.h.type.descriptor.sql.BasicExtractor   : extracted value ([username5_0_0_] : [VARCHAR]) - [account1]
Hibernate: select user0_.id as id1_0_0_, user0_.age as age2_0_0_, user0_.balance as balance3_0_0_, user0_.name as name4_0_0_, user0_.username as username5_0_0_ from user user0_ where user0_.id=?
2018-06-16 08:56:57.129 TRACE 3396 --- [nio-8000-exec-4] o.h.type.descriptor.sql.BasicBinder      : binding parameter [1] as [BIGINT] - [1]
2018-06-16 08:56:57.130 TRACE 3396 --- [nio-8000-exec-4] o.h.type.descriptor.sql.BasicExtractor   : extracted value ([age2_0_0_] : [INTEGER]) - [20]
2018-06-16 08:56:57.130 TRACE 3396 --- [nio-8000-exec-4] o.h.type.descriptor.sql.BasicExtractor   : extracted value ([balance3_0_0_] : [NUMERIC]) - [100.00]
2018-06-16 08:56:57.130 TRACE 3396 --- [nio-8000-exec-4] o.h.type.descriptor.sql.BasicExtractor   : extracted value ([name4_0_0_] : [VARCHAR]) - [张三]
2018-06-16 08:56:57.130 TRACE 3396 --- [nio-8000-exec-4] o.h.type.descriptor.sql.BasicExtractor   : extracted value ([username5_0_0_] : [VARCHAR]) - [account1]
2018-06-16 08:58:45.337  INFO 3396 --- [trap-executor-0] c.n.d.s.r.aws.ConfigClusterResolver      : Resolving eureka endpoints via configuration
Hibernate: select user0_.id as id1_0_0_, user0_.age as age2_0_0_, user0_.balance as balance3_0_0_, user0_.name as name4_0_0_, user0_.username as username5_0_0_ from user user0_ where user0_.id=?
2018-06-16 08:58:49.603 TRACE 3396 --- [nio-8000-exec-5] o.h.type.descriptor.sql.BasicBinder      : binding parameter [1] as [BIGINT] - [1]
2018-06-16 08:58:49.603 TRACE 3396 --- [nio-8000-exec-5] o.h.type.descriptor.sql.BasicExtractor   : extracted value ([age2_0_0_] : [INTEGER]) - [20]
2018-06-16 08:58:49.603 TRACE 3396 --- [nio-8000-exec-5] o.h.type.descriptor.sql.BasicExtractor   : extracted value ([balance3_0_0_] : [NUMERIC]) - [100.00]
2018-06-16 08:58:49.603 TRACE 3396 --- [nio-8000-exec-5] o.h.type.descriptor.sql.BasicExtractor   : extracted value ([name4_0_0_] : [VARCHAR]) - [张三]
2018-06-16 08:58:49.603 TRACE 3396 --- [nio-8000-exec-5] o.h.type.descriptor.sql.BasicExtractor   : extracted value ([username5_0_0_] : [VARCHAR]) - [account1]

4次访问8001端口


2018-06-16 08:56:39.230  INFO 11828 --- [nio-8001-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring FrameworkServlet 'dispatcherServlet'
2018-06-16 08:56:39.231  INFO 11828 --- [nio-8001-exec-1] o.s.web.servlet.DispatcherServlet        : FrameworkServlet 'dispatcherServlet': initialization started
2018-06-16 08:56:39.423  INFO 11828 --- [nio-8001-exec-1] o.s.web.servlet.DispatcherServlet        : FrameworkServlet 'dispatcherServlet': initialization completed in 192 ms
Hibernate: select user0_.id as id1_0_0_, user0_.age as age2_0_0_, user0_.balance as balance3_0_0_, user0_.name as name4_0_0_, user0_.username as username5_0_0_ from user user0_ where user0_.id=?
2018-06-16 08:56:39.553 TRACE 11828 --- [nio-8001-exec-1] o.h.type.descriptor.sql.BasicBinder      : binding parameter [1] as [BIGINT] - [1]
2018-06-16 08:56:39.567 TRACE 11828 --- [nio-8001-exec-1] o.h.type.descriptor.sql.BasicExtractor   : extracted value ([age2_0_0_] : [INTEGER]) - [20]
2018-06-16 08:56:39.568 TRACE 11828 --- [nio-8001-exec-1] o.h.type.descriptor.sql.BasicExtractor   : extracted value ([balance3_0_0_] : [NUMERIC]) - [100.00]
2018-06-16 08:56:39.569 TRACE 11828 --- [nio-8001-exec-1] o.h.type.descriptor.sql.BasicExtractor   : extracted value ([name4_0_0_] : [VARCHAR]) - [瀵姳绗乚
2018-06-16 08:56:39.569 TRACE 11828 --- [nio-8001-exec-1] o.h.type.descriptor.sql.BasicExtractor   : extracted value ([username5_0_0_] : [VARCHAR]) - [account1]
Hibernate: select user0_.id as id1_0_0_, user0_.age as age2_0_0_, user0_.balance as balance3_0_0_, user0_.name as name4_0_0_, user0_.username as username5_0_0_ from user user0_ where user0_.id=?
2018-06-16 08:56:44.995 TRACE 11828 --- [nio-8001-exec-2] o.h.type.descriptor.sql.BasicBinder      : binding parameter [1] as [BIGINT] - [1]
2018-06-16 08:56:44.996 TRACE 11828 --- [nio-8001-exec-2] o.h.type.descriptor.sql.BasicExtractor   : extracted value ([age2_0_0_] : [INTEGER]) - [20]
2018-06-16 08:56:44.996 TRACE 11828 --- [nio-8001-exec-2] o.h.type.descriptor.sql.BasicExtractor   : extracted value ([balance3_0_0_] : [NUMERIC]) - [100.00]
2018-06-16 08:56:44.996 TRACE 11828 --- [nio-8001-exec-2] o.h.type.descriptor.sql.BasicExtractor   : extracted value ([name4_0_0_] : [VARCHAR]) - [瀵姳绗乚
2018-06-16 08:56:44.996 TRACE 11828 --- [nio-8001-exec-2] o.h.type.descriptor.sql.BasicExtractor   : extracted value ([username5_0_0_] : [VARCHAR]) - [account1]
Hibernate: select user0_.id as id1_0_0_, user0_.age as age2_0_0_, user0_.balance as balance3_0_0_, user0_.name as name4_0_0_, user0_.username as username5_0_0_ from user user0_ where user0_.id=?
2018-06-16 08:56:51.624 TRACE 11828 --- [nio-8001-exec-3] o.h.type.descriptor.sql.BasicBinder      : binding parameter [1] as [BIGINT] - [1]
2018-06-16 08:56:51.624 TRACE 11828 --- [nio-8001-exec-3] o.h.type.descriptor.sql.BasicExtractor   : extracted value ([age2_0_0_] : [INTEGER]) - [20]
2018-06-16 08:56:51.624 TRACE 11828 --- [nio-8001-exec-3] o.h.type.descriptor.sql.BasicExtractor   : extracted value ([balance3_0_0_] : [NUMERIC]) - [100.00]
2018-06-16 08:56:51.624 TRACE 11828 --- [nio-8001-exec-3] o.h.type.descriptor.sql.BasicExtractor   : extracted value ([name4_0_0_] : [VARCHAR]) - [瀵姳绗乚
2018-06-16 08:56:51.624 TRACE 11828 --- [nio-8001-exec-3] o.h.type.descriptor.sql.BasicExtractor   : extracted value ([username5_0_0_] : [VARCHAR]) - [account1]
Hibernate: select user0_.id as id1_0_0_, user0_.age as age2_0_0_, user0_.balance as balance3_0_0_, user0_.name as name4_0_0_, user0_.username as username5_0_0_ from user user0_ where user0_.id=?
2018-06-16 08:56:55.351 TRACE 11828 --- [nio-8001-exec-4] o.h.type.descriptor.sql.BasicBinder      : binding parameter [1] as [BIGINT] - [1]
2018-06-16 08:56:55.352 TRACE 11828 --- [nio-8001-exec-4] o.h.type.descriptor.sql.BasicExtractor   : extracted value ([age2_0_0_] : [INTEGER]) - [20]
2018-06-16 08:56:55.352 TRACE 11828 --- [nio-8001-exec-4] o.h.type.descriptor.sql.BasicExtractor   : extracted value ([balance3_0_0_] : [NUMERIC]) - [100.00]
2018-06-16 08:56:55.352 TRACE 11828 --- [nio-8001-exec-4] o.h.type.descriptor.sql.BasicExtractor   : extracted value ([name4_0_0_] : [VARCHAR]) - [瀵姳绗乚
2018-06-16 08:56:55.352 TRACE 11828 --- [nio-8001-exec-4] o.h.type.descriptor.sql.BasicExtractor   : extracted value ([username5_0_0_] : [VARCHAR]) - [account1]
2018-06-16 08:57:11.589  INFO 11828 --- [trap-executor-0] c.n.d.s.r.aws.ConfigClusterResolver      : Resolving eureka endpoints via configuration
2018-06-16 09:02:11.591  INFO 11828 --- [trap-executor-0] c.n.d.s.r.aws.ConfigClusterResolver      : Resolving eureka endpoints via configuration

我的微信公众号：架构真经（id：gentoo666），分享Java干货，高并发编程，热门技术教程，微服务及分布式技术，架构设计，区块链技术，人工智能，大数据，Java面试题，以及前沿热门资讯等。每日更新哦！

参考资料：

https://blog.csdn.net/chengqiuming/article/details/80711168

SpringCloud系列-Ribbon的基本应用相关推荐

SpringCloud系列——Zuul 动态路由
前言 Zuul 是在Spring Cloud Netflix平台上提供动态路由,监控,弹性,安全等边缘服务的框架,是Netflix基于jvm的路由器和服务器端负载均衡器,相当于是设备和 Netflix ...
J360-cloud SpringCloud系列二：服务发现Discovery Service
2019独角兽企业重金招聘Python工程师标准>>> j360开源博客之 ----------------------------------------------------- ...
SpringCloud系列研究---Eureka服务消费Feign
转载自:https://www.cnblogs.com/chxuyuan/p/8358998.html SpringCloud系列研究---Eureka服务消费Feign 一.Feign简介 Feig ...
08、SpringCloud 系列：Nacos - 安装、启动
SpringCloud 系列列表: 文章名文章地址 01.Eureka - 集群.服务发现 https://blog.csdn.net/qq_46023503/article/details/128 ...
SpringCloud系列博客父工程xml依赖
SpringCloud系列博客父工程xml依赖 <?xml version="1.0" encoding="UTF-8"?><project ...
SpringCloud系列之Nacos+Dubbo+Seata应用篇
SpringCloud系列之Nacos+Dubbo+Seata应用篇原文链接:https://www.cnblogs.com/chinaWu/p/13671620.html ---------- 源 ...
SpringCloud系列教程(五)之SpringCloud Gateway 网关聚合开发文档 swagger knife4j 和登录权限统一验证【Hoxton版】
阅读提醒: 本文面向的是有一定springboot基础者本次教程使用的Spring Cloud Hoxton RELEASE版本由于knife4j比swagger更加友好,所以本文集成knife4 ...
SpringCloud 微信小程序授权登录获取openId SessionKey【SpringCloud系列13】
SpringCloud 大型系列课程正在制作中,欢迎大家关注与提意见. 自我提升方法推荐:神奇的早起早上 5:00 -5:20 起床刷牙 5:30-6:00 晨练(跑步.跳绳.骑自行车.打球等等) ...
SpringCloud之Ribbon简单入门
提出疑问 ① 如何在配置Eureka Client注册中心时不去硬编码Eureka Server的地址? ② 在微服务不同模块间进行通信时,如何不去硬编码服务提供者的地址? ③ 当部署多个相同微服务时 ...

SpringCloud系列-Ribbon的基本应用

一 Ribbon简介

二新建microservice-consumer-movie-ribbon项目

1 为RestTemplate添加注解@LoadBalanced

2 修改Controller代码

3 配置文件

三测试

SpringCloud系列-Ribbon的基本应用相关推荐

最新文章

热门文章

SpringCloud系列-Ribbon的基本应用

一 Ribbon简介

二 新建microservice-consumer-movie-ribbon项目

1 为RestTemplate添加注解@LoadBalanced

2 修改Controller代码

3 配置文件

三 测试

SpringCloud系列-Ribbon的基本应用相关推荐

最新文章

热门文章

二新建microservice-consumer-movie-ribbon项目

三测试