Ribbon的基本应用

其他 2018-06-24 17:39:40 阅读次数: 2
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 
package com.itmuch.cloud.study;

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
  @LoadBalanced
  public RestTemplate restTemplate() {
    return new RestTemplate();
  }

  public static void main(String[] args) {
    SpringApplication.run(ConsumerMovieApplication.class, args);
  }
}
2 修改Controller代码 
package com.itmuch.cloud.study.user.controller;

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);
  @Autowired
  private RestTemplate restTemplate;
  @Autowired
  private LoadBalancerClient loadBalancerClient;

  @GetMapping("/user/{id}")
  public User findById(@PathVariable Long id) {
    //VIP:virtual IP
    return 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
1 启动eureka微服务
2 启动movie-ribbon微服务
3 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-user
  jpa:
    generate-ddl: false
    show-sql: true
    hibernate:
      ddl-auto: none
  datasource:                           # 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SQL
  level:
    root: INFO
    org.hibernate: INFO
    org.hibernate.type.descriptor.sql.BasicBinder: TRACE
    org.hibernate.type.descriptor.sql.BasicExtractor: TRACE
eureka:
  client:
    healthcheck:
      enabled: true
    serviceUrl:
      defaultZone:http://localhost:8761/eureka/
      #defaultZone: http://user:password123@localhost:8761/eureka/
  instance:
    prefer-ip-address: true
启动第两个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





猜你喜欢

转载自blog.csdn.net/chengqiuming/article/details/80711168
今日推荐
火速冲上 GitHub 热榜 —— 开源编程语言、框架哪有这么可爱？
北京人形机器人创新中心发布全球首个纯电驱拟人奔跑的全尺寸人形机器人“天工”
LFOSSA 源来如此公开课 | 掌握云原生未来：CNCF 认证全面攻略与备考秘籍
国产云输入法——仅华为无云端数据上传安全问题
开源日报 | 工业开源项目OGG 1.0；姐姐，你要和我一起配置火狐吗；苹果AI遥遥落后？Fedora 40
开放签电子签章：停止新增，优化体验，前进更进（五一假期前工作）
开源日报 | 中学生开源前端动画引擎；全球首个Llama3 8B中文版开源模型；联想电脑恐出局；Linus讽刺AI炒作
周排行
浏览器对同一域名进行请求的最大并发连接数
React Hook之自定义Hook
【转】MyBatis缓存机制
-Java-泛型
自动化测试常用脚本-发送邮件
LeetCode#859: Buddy Strings
java、Python处理字符串
第二篇の博客
Hadoop伪分布式环境安装
SQL Server进阶（十一）临时表、表变量
每日归档
更多
2024-04-27(56)
2024-04-26(39)
2024-04-25(22)
2024-04-24(36)
2024-04-23(26)
2024-04-22(39)
2024-04-21(0)
2024-04-20(6)
2024-04-19(5)
2024-04-18(0)

代码天地 © 2018 codetd.com

境外服务器   最新电视剧2022