Spring Cloud入门-Bus消息总线(Hoxton版本)

亦凉 2021-09-21 01:24 327阅读 0赞

### 文章目录 ###

*   *  Spring Cloud入门系列汇总
     *  摘要
     *  Spring Cloud Bus 简介
     *  RabbitMQ的安装
     *  动态刷新配置
     *   *  给config-server添加消息总线支持
         *  给config-client添加消息总线支持
         *  动态刷新配置演示
     *  配合WebHooks使用
     *  使用到的模块
     *  项目源码地址

> 项目使用的Spring Cloud为Hoxton版本，Spring Boot为2.2.2.RELEASE版本

## Spring Cloud入门系列汇总 ##

<table> 
 <thead> 
  <tr> 
   <th>序号</th> 
   <th>内容</th> 
   <th>链接地址</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>1</td> 
   <td>Spring Cloud入门-十分钟了解Spring Cloud</td> 
   <td><a href="https://blog.csdn.net/ThinkWon/article/details/103715146" rel="nofollow">https://blog.csdn.net/ThinkWon/article/details/103715146</a></td> 
  </tr> 
  <tr> 
   <td>2</td> 
   <td>Spring Cloud入门-Eureka服务注册与发现(Hoxton版本)</td> 
   <td><a href="https://blog.csdn.net/ThinkWon/article/details/103726655" rel="nofollow">https://blog.csdn.net/ThinkWon/article/details/103726655</a></td> 
  </tr> 
  <tr> 
   <td>3</td> 
   <td>Spring Cloud入门-Ribbon服务消费者(Hoxton版本)</td> 
   <td><a href="https://blog.csdn.net/ThinkWon/article/details/103729080" rel="nofollow">https://blog.csdn.net/ThinkWon/article/details/103729080</a></td> 
  </tr> 
  <tr> 
   <td>4</td> 
   <td>Spring Cloud入门-Hystrix断路器(Hoxton版本)</td> 
   <td><a href="https://blog.csdn.net/ThinkWon/article/details/103732497" rel="nofollow">https://blog.csdn.net/ThinkWon/article/details/103732497</a></td> 
  </tr> 
  <tr> 
   <td>5</td> 
   <td>Spring Cloud入门-Hystrix Dashboard与Turbine断路器监控(Hoxton版本)</td> 
   <td><a href="https://blog.csdn.net/ThinkWon/article/details/103734664" rel="nofollow">https://blog.csdn.net/ThinkWon/article/details/103734664</a></td> 
  </tr> 
  <tr> 
   <td>6</td> 
   <td>Spring Cloud入门-OpenFeign服务消费者(Hoxton版本)</td> 
   <td><a href="https://blog.csdn.net/ThinkWon/article/details/103735751" rel="nofollow">https://blog.csdn.net/ThinkWon/article/details/103735751</a></td> 
  </tr> 
  <tr> 
   <td>7</td> 
   <td>Spring Cloud入门-Zuul服务网关(Hoxton版本)</td> 
   <td><a href="https://blog.csdn.net/ThinkWon/article/details/103738851" rel="nofollow">https://blog.csdn.net/ThinkWon/article/details/103738851</a></td> 
  </tr> 
  <tr> 
   <td>8</td> 
   <td>Spring Cloud入门-Config分布式配置中心(Hoxton版本)</td> 
   <td><a href="https://blog.csdn.net/ThinkWon/article/details/103739628" rel="nofollow">https://blog.csdn.net/ThinkWon/article/details/103739628</a></td> 
  </tr> 
  <tr> 
   <td>9</td> 
   <td>Spring Cloud入门-Bus消息总线(Hoxton版本)</td> 
   <td><a href="https://blog.csdn.net/ThinkWon/article/details/103753372" rel="nofollow">https://blog.csdn.net/ThinkWon/article/details/103753372</a></td> 
  </tr> 
  <tr> 
   <td>10</td> 
   <td>Spring Cloud入门-Sleuth服务链路跟踪(Hoxton版本)</td> 
   <td><a href="https://blog.csdn.net/ThinkWon/article/details/103753896" rel="nofollow">https://blog.csdn.net/ThinkWon/article/details/103753896</a></td> 
  </tr> 
  <tr> 
   <td>11</td> 
   <td>Spring Cloud入门-Consul服务注册发现与配置中心(Hoxton版本)</td> 
   <td><a href="https://blog.csdn.net/ThinkWon/article/details/103756139" rel="nofollow">https://blog.csdn.net/ThinkWon/article/details/103756139</a></td> 
  </tr> 
  <tr> 
   <td>12</td> 
   <td>Spring Cloud入门-Gateway服务网关(Hoxton版本)</td> 
   <td><a href="https://blog.csdn.net/ThinkWon/article/details/103757927" rel="nofollow">https://blog.csdn.net/ThinkWon/article/details/103757927</a></td> 
  </tr> 
  <tr> 
   <td>13</td> 
   <td>Spring Cloud入门-Admin服务监控中心(Hoxton版本)</td> 
   <td><a href="https://blog.csdn.net/ThinkWon/article/details/103758697" rel="nofollow">https://blog.csdn.net/ThinkWon/article/details/103758697</a></td> 
  </tr> 
  <tr> 
   <td>14</td> 
   <td>Spring Cloud入门-Oauth2授权的使用(Hoxton版本)</td> 
   <td><a href="https://blog.csdn.net/ThinkWon/article/details/103761687" rel="nofollow">https://blog.csdn.net/ThinkWon/article/details/103761687</a></td> 
  </tr> 
  <tr> 
   <td>15</td> 
   <td>Spring Cloud入门-Oauth2授权之JWT集成(Hoxton版本)</td> 
   <td><a href="https://blog.csdn.net/ThinkWon/article/details/103763364" rel="nofollow">https://blog.csdn.net/ThinkWon/article/details/103763364</a></td> 
  </tr> 
  <tr> 
   <td>16</td> 
   <td>Spring Cloud入门-Oauth2授权之基于JWT完成单点登录(Hoxton版本)</td> 
   <td><a href="https://blog.csdn.net/ThinkWon/article/details/103766368" rel="nofollow">https://blog.csdn.net/ThinkWon/article/details/103766368</a></td> 
  </tr> 
  <tr> 
   <td>17</td> 
   <td>Spring Cloud入门-Nacos实现注册和配置中心(Hoxton版本)</td> 
   <td><a href="https://blog.csdn.net/ThinkWon/article/details/103769680" rel="nofollow">https://blog.csdn.net/ThinkWon/article/details/103769680</a></td> 
  </tr> 
  <tr> 
   <td>18</td> 
   <td>Spring Cloud入门-Sentinel实现服务限流、熔断与降级(Hoxton版本)</td> 
   <td><a href="https://blog.csdn.net/ThinkWon/article/details/103770879" rel="nofollow">https://blog.csdn.net/ThinkWon/article/details/103770879</a></td> 
  </tr> 
  <tr> 
   <td>19</td> 
   <td>Spring Cloud入门-Seata处理分布式事务问题(Hoxton版本)</td> 
   <td><a href="https://blog.csdn.net/ThinkWon/article/details/103786102" rel="nofollow">https://blog.csdn.net/ThinkWon/article/details/103786102</a></td> 
  </tr> 
  <tr> 
   <td>20</td> 
   <td>Spring Cloud入门-汇总篇(Hoxton版本)</td> 
   <td><a href="https://blog.csdn.net/ThinkWon/article/details/103786588" rel="nofollow">https://blog.csdn.net/ThinkWon/article/details/103786588</a></td> 
  </tr> 
 </tbody> 
</table>

## 摘要 ##

Spring Cloud Bus 使用轻量级的消息代理来连接微服务架构中的各个服务，可以将其用于广播状态更改（例如配置中心配置更改）或其他管理指令，本文将对其用法进行详细介绍。

## Spring Cloud Bus 简介 ##

我们通常会使用消息代理来构建一个主题，然后把微服务架构中的所有服务都连接到这个主题上去，当我们向该主题发送消息时，所有订阅该主题的服务都会收到消息并进行消费。使用 Spring Cloud Bus 可以方便地构建起这套机制，所以 Spring Cloud Bus 又被称为消息总线。Spring Cloud Bus 配合 Spring Cloud Config 使用可以实现配置的动态刷新。目前 Spring Cloud Bus 支持两种消息代理：RabbitMQ 和 Kafka，下面以 RabbitMQ 为例来演示下使用Spring Cloud Bus 动态刷新配置的功能。

## RabbitMQ的安装 ##

安装Erlang，下载地址：[http://erlang.org/download…][http_erlang.org_download]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly90aGlua3dvbi5ibG9nLmNzZG4ubmV0_size_16_color_FFFFFF_t_70]

安装RabbitMQ，下载地址：[https://dl.bintray.com/rabbitmq…][https_dl.bintray.com_rabbitmq]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly90aGlua3dvbi5ibG9nLmNzZG4ubmV0_size_16_color_FFFFFF_t_70 1]

安装完成后，进入RabbitMQ安装目录下的sbin目录：

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly90aGlua3dvbi5ibG9nLmNzZG4ubmV0_size_16_color_FFFFFF_t_70 2]

在RabbitMQ安装目录下的sbin目录的地址栏输入cmd并回车启动命令行，然后输入以下命令启动管理功能：

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly90aGlua3dvbi5ibG9nLmNzZG4ubmV0_size_16_color_FFFFFF_t_70 3]

rabbitmq-plugins enable rabbitmq_management

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly90aGlua3dvbi5ibG9nLmNzZG4ubmV0_size_16_color_FFFFFF_t_70 4]

访问地址查看是否安装成功：[http://localhost:15672/][http_localhost_15672]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly90aGlua3dvbi5ibG9nLmNzZG4ubmV0_size_16_color_FFFFFF_t_70 5]

输入账号密码并登录：guest guest

## 动态刷新配置 ##

> 使用 Spring Cloud Bus 动态刷新配置需要配合 Spring Cloud Config 一起使用，我们使用[上一节][Link 1]中的config-server、config-client模块来演示下该功能。

### 给config-server添加消息总线支持 ###

在pom.xml中添加相关依赖：

<dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-bus-amqp</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-actuator</artifactId>
    </dependency>

添加配置文件application-amqp.yml，主要是添加了RabbitMQ的配置及暴露了刷新配置的Actuator端点；

server:
      port: 8904
    
    spring:
      application:
        name: config-server
      cloud:
        config:
          server:
            git:
              # 配置存储配置信息的Git仓库
              uri: https://gitee.com/JourWon/springcloud-config.git
              username: JourWon
              password: 123456
              # 开启启动时直接从git获取配置
              clone-on-start: true
              # 获取子目录下的配置
        # search-paths: '{application}'
      # rabbitmq相干配置
      rabbitmq:
        host: localhost
        port: 5672
        username: guest
        password: guest
    
    eureka:
      client:
        register-with-eureka: true
        fetch-registry: true
        service-url:
          defaultZone: http://localhost:8001/eureka/
    
    # 暴露bus刷新配置的端点
    management:
      endpoints:
        web:
          exposure:
            include: 'bus-refresh'

### 给config-client添加消息总线支持 ###

在pom.xml中添加相关依赖：

<dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-bus-amqp</artifactId>
    </dependency>

添加配置文件bootstrap-amqp1.yml及bootstrap-amqp2.yml用于启动两个不同的config-client，两个配置文件只有端口号不同；

server:
      port: 9004
    
    spring:
      application:
        name: config-client
      cloud:
        # config客户端配置
        config:
          # 分支名称
          label: master
          # 启用配置后缀名称
          profile: dev
          # 配置文件名称
          name: config
          discovery:
            enabled: true
            service-id: config-server
      # rabbitmq配置
      rabbitmq:
        host: localhost
        port: 5672
        username: guest
        password: guest
    
    eureka:
      client:
        register-with-eureka: true
        fetch-registry: true
        service-url:
          defaultZone: http://localhost:8001/eureka/
    
    management:
      endpoints:
        web:
          exposure:
            include: 'refresh'

### 动态刷新配置演示 ###

我们先启动相关服务，启动eureka-server，以application-amqp.yml为配置启动config-server，以bootstrap-amqp1.yml为配置启动config-client，以bootstrap-amqp2.yml为配置再启动一个config-client，启动后注册中心显示如下：

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly90aGlua3dvbi5ibG9nLmNzZG4ubmV0_size_16_color_FFFFFF_t_70 6]

启动所有服务后，我们登录RabbitMQ的控制台可以发现 Spring Cloud Bus 创建了一个叫springCloudBus的交换机及三个以 springCloudBus.anonymous开头的队列：

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly90aGlua3dvbi5ibG9nLmNzZG4ubmV0_size_16_color_FFFFFF_t_70 7]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly90aGlua3dvbi5ibG9nLmNzZG4ubmV0_size_16_color_FFFFFF_t_70 8]

调用[http://localhost:9004/configInfo][http_localhost_9004_configInfo]，结果如下

config info for dev(master)

我们先修改Git仓库中master分支下的config-dev.yml配置文件：

![调用注册中心的接口刷新所有配置](C:\Users\JourW\Desktop\My Spring Cloud\Spring Cloud入门-Bus消息总线(Hoxton版本)\调用注册中心的接口刷新所有配置.png)# 修改前信息
    config:
      info: "config info for dev(master)"
    # 修改后信息
    config:
      info: "update config info for dev(master)"

调用注册中心的接口刷新所有配置：[http://localhost:8904/actuator/bus-refresh][http_localhost_8904_actuator_bus-refresh]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly90aGlua3dvbi5ibG9nLmNzZG4ubmV0_size_16_color_FFFFFF_t_70 9]

刷新后再分别调用 [http://localhost:9004/configInfo][http_localhost_9004_configInfo] 和 [http://localhost:9005/configInfo][http_localhost_9005_configInfo] 获取配置信息，发现都已经刷新了；

update config info for dev(master)

如果只需要刷新指定实例的配置可以使用以下格式进行刷新：http://localhost:8904/actuator/bus-refresh/\{destination\} ，我们这里以刷新运行在9004端口上的config-client为例[http://localhost:8904/actuator/bus-refresh/config-client:9004][http_localhost_8904_actuator_bus-refresh_config-client_9004]。

## 配合WebHooks使用 ##

WebHooks相当于是一个钩子函数，我们可以配置当向Git仓库push代码时触发这个钩子函数，这里以Gitee为例来介绍下其使用方式，这里当我们向配置仓库push代码时就会自动刷新服务配置了。

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly90aGlua3dvbi5ibG9nLmNzZG4ubmV0_size_16_color_FFFFFF_t_70 10]

## 使用到的模块 ##

springcloud-learning
    ├── eureka-server -- eureka注册中心
    ├── config-server -- 配置中心服务
    └── config-client -- 获取配置的客户端服务

## 项目源码地址 ##

[GitHub项目源码地址][GitHub]

[http_erlang.org_download]: http://erlang.org/download/otp_win64_22.2.exe
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly90aGlua3dvbi5ibG9nLmNzZG4ubmV0_size_16_color_FFFFFF_t_70]: /images/20210920/05b115619d034edd8262d99b1c08e2a6.png
[https_dl.bintray.com_rabbitmq]: https://dl.bintray.com/rabbitmq/all/rabbitmq-server/3.8.2/rabbitmq-server-3.8.2.exe
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly90aGlua3dvbi5ibG9nLmNzZG4ubmV0_size_16_color_FFFFFF_t_70 1]: /images/20210920/5bf2aef6a41347c1944180ce09854899.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly90aGlua3dvbi5ibG9nLmNzZG4ubmV0_size_16_color_FFFFFF_t_70 2]: /images/20210920/78fcaf6ca8034b56ae87a4d6637de74f.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly90aGlua3dvbi5ibG9nLmNzZG4ubmV0_size_16_color_FFFFFF_t_70 3]: /images/20210920/3fdf0b580e3f437c9e14f1e8987b6d20.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly90aGlua3dvbi5ibG9nLmNzZG4ubmV0_size_16_color_FFFFFF_t_70 4]: /images/20210920/008acf51fe554a9fb6583c7d9e1728ea.png
[http_localhost_15672]: http://localhost:15672/
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly90aGlua3dvbi5ibG9nLmNzZG4ubmV0_size_16_color_FFFFFF_t_70 5]: /images/20210920/d60ad1f68368432f9660a167d17692f1.png
[Link 1]: https://blog.csdn.net/ThinkWon/article/details/103739628
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly90aGlua3dvbi5ibG9nLmNzZG4ubmV0_size_16_color_FFFFFF_t_70 6]: /images/20210920/c7c640531f9f4212ac2d8651e1324610.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly90aGlua3dvbi5ibG9nLmNzZG4ubmV0_size_16_color_FFFFFF_t_70 7]: /images/20210920/33afacf26a554f5faa39ea17fdc81470.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly90aGlua3dvbi5ibG9nLmNzZG4ubmV0_size_16_color_FFFFFF_t_70 8]: /images/20210920/a85edb9bf92742dfac300ae714beb3fd.png
[http_localhost_9004_configInfo]: http://localhost:9004/configInfo
[http_localhost_8904_actuator_bus-refresh]: http://localhost:8904/actuator/bus-refresh
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly90aGlua3dvbi5ibG9nLmNzZG4ubmV0_size_16_color_FFFFFF_t_70 9]: /images/20210920/cc5e8820534c460a9984e5526fe848a7.png
[http_localhost_9005_configInfo]: http://localhost:9005/configInfo
[http_localhost_8904_actuator_bus-refresh_config-client_9004]: http://localhost:8904/actuator/bus-refresh/config-client:9004
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly90aGlua3dvbi5ibG9nLmNzZG4ubmV0_size_16_color_FFFFFF_t_70 10]: /images/20210920/570b4180c6e9411181c3bcae1452cc99.png
[GitHub]: https://github.com/JourWon/springcloud-learning