SpringCloud Bus 消息总线

作用：

      1：分布式自动刷新配置功能

      2：Spring Cloud Bus配合Spring Cloud Config使用可以实现配置的动态刷新

一：SpringCloud Bus动态刷新全局广播

这里的RabbitMq中的的topic中的队列是名称就是springCloudBus:

两种的设计思想：

1) 利用消息总线触发一个客户端/bus/refresh,而刷新所有客户端的配置

2) 利用消息总线触发一个服务端ConfigServer的/bus/refresh端点,而刷新所有客户端的配置（更加推荐）

图二的架构显然更加合适，图一不适合的原因如下

大纲：

3344config--center配置如下：

pom；

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>cloud2020</artifactId>
        <groupId>com.atguigu.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloud-config-center-3344</artifactId>

    <dependencies>
        <!--添加消息总线RbbitMQ支持-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-bus-amqp</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-config-server</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>
</project>

YML;

server:
  port: 3344

spring:
  application:
    name: cloud-config-center
  cloud:
    config:
      server:
        git:
          uri: git@github.com:TNoOne/cloud-config.git #github仓库上面的git仓库名字
          ##搜索目录
          search-paths:
            - cloud-config
      #读取分支
      label: master

  #rabbit相关配置
  rabbitmq:
    host: localhost
    port: 5672
    username: guest
    password: guest

eureka:
  client:
    service-url:
      defaultZone: http://localhost:7001/eureka #注册进eureka

#rabbitmq相关配置，暴露bus刷新配置的端点
management:
  endpoints:  #暴露bus刷新配置的端点
    web:
      exposure:
        include: 'bus-refresh'  #凡是暴露监控、刷新的都要有actuator依赖，bus-refresh就是actuator的刷新操作

3355和3366Config---client的配置：

POM；

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>cloud2020</artifactId>
        <groupId>com.atguigu.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloud-config-client-3355</artifactId>

    <dependencies>
        <!--添加消息总线rabbitMQ支持-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-bus-amqp</artifactId>
        </dependency>
        <!--不带server了，说明是客户端-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-config</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>
</project>

YML:

server:
  port: 3355

spring:
  application:
    name: config-client
  cloud:
    #Config客户端配置
    config:
      label: master #分支名称
      name: config #配置文件名称
      profile: dev #读取后缀名称 上述3个综合：master分支上config-dev.yml的配置文件被读取 http://config-3344.com:3344/master/config-dev.yml
      uri: http://localhost:3344 #配置中心地址
  #rabbit相关配置 15672是web管理界面的端口，5672是MQ访问的端口
  rabbitmq:
    host: localhost
    port: 5672
    username: guest
    password: guest

#服务注册到eureka地址
eureka:
  client:
    service-url:
      defaultZone: http://localhost:7001/eureka

#暴露监控端点
management:
  endpoints:
    web:
      exposure:
        include: "*"