（八）Java B2B2C o2o多用戶商城 springcloud架構-消息總線(Spring Cloud Bus)

Spring Cloud Bus 將分佈式的節點用輕量的消息代理鏈接起來。它能夠用於廣播配置文件的更改或者服務之間的通信，也能夠用於監控。本文要講述的是用Spring Cloud Bus實現通知微服務架構的配置文件的更改。

1、準備工做

本文仍是基於上一篇文章來實現。按照官方文檔，咱們只須要在配置文件中配置 spring-cloud-starter-bus-amqp ；這就是說咱們須要裝rabbitMq，點擊rabbitmq下載。至於怎麼使用 rabbitmq，搜索引擎下。

2、改造config-client

在pom文件加上起步依賴spring-cloud-starter-bus-amqp，完整的配置文件以下：

<?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">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.forezp</groupId>
    <artifactId>config-client</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>
    <name>config-client</name>
    <description>Demo project for Spring Boot</description>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.2.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.retry</groupId>
            <artifactId>spring-retry</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-config</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-aop</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <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>
    </dependencies>
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Dalston.RC1</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
    <repositories>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>
</project>

在配置文件application.properties中加上RabbitMq的配置，包括RabbitMq的地址、端口，用戶名、密碼，代碼以下：

spring.rabbitmq.host=localhost
spring.rabbitmq.port=5672
# spring.rabbitmq.username=
# spring.rabbitmq.password=

若是rabbitmq有用戶名密碼，輸入便可。

依次啓動eureka-server、confg-cserver,啓動兩個config-client，端口爲：888一、8882。

訪問http://localhost:8881/hi 或者http://localhost:8882/hi 瀏覽器顯示

另外，/bus/refresh接口能夠指定服務，即便用」destination」參數，好比 「/bus/refresh?destination=customers:**」 即刷新服務名爲customers的全部服務，無論ip。

架構代碼以下：

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