基于Spring boot 2.0 搭建spring cloud 消息总线

      最近按照网上教程学习搭建spring cloud消息总线例子，但是网上的步骤大都基于spring boot 1.x的版本，导致踩了很多坑，今天在这里更新一下基于spring boot 2.0 搭建spring cloud消息总线的教程，以及需要注意的事项。
本文采用的IDE为IntelliJ; 构建的项目的方式通过Maven构建。
eurekaServer：创建服务注册中心
1. 添加依赖服务：spring-cloud-starter-netflix-eureka-server，spring-boot-starter-web，具体配置如下：<?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.springcloud</groupId>
<artifactId>configeurekaserver</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>configeurekaserver</name>
<description>Demo project for Spring Boot</description>

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.0.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>
<spring-cloud.version>Finchley.M8</spring-cloud.version>
</properties>

<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
</dependency>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<version>1.5.9.RELEASE</version>
</dependency>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>

<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</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>
2. 添加配置文件application.yml：server:
port: 8889
eureka:
instance:
hostname: localhost
client:
register-with-eureka: false
fetch-registry: false
service-url:
defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/3. 主程序添加@EnableEurekaServer注解
config-server服务
1.添加依赖服务：spring-cloud-starter-netflix-eureka-server， spring-cloud-config-server， spring-cloud-starter-eureka，具体配置如下：<?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.springcloud</groupId>
<artifactId>cloudconfigserver</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>cloudconfigserver</name>
<description>Demo project for Spring Boot</description>

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.0.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>
<spring-cloud.version>Finchley.M8</spring-cloud.version>
</properties>

<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
</dependency>

<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-config-server</artifactId>
<!--<version>1.2.2.RELEASE</version>-->
</dependency>

<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-eureka</artifactId>
<version>1.4.3.RELEASE</version>
</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>-->

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>

<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</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>
2. 修改配置文件application.properties:spring.application.name=config-server #服务名称
server.port
b177
=8888 #服务端口

#https://github.com/forezp/SpringcloudConfig/

spring.cloud.config.server.git.uri=https://github.com/fyjfengyujie/SpringRespo/ #远程git仓库
spring.cloud.config.server.git.search-paths= #远程仓库的目录，本例子配置文件在根目录中
spring.cloud.config.label=master #git分支名称
spring.cloud.config.server.git.username= #git仓库账号
spring.cloud.config.server.git.password= #git仓库密码
eureka.client.service-url.defaultZone=http://localhost:8889/eureka/ #eureka服务注册中心3. 主程序入口添加@EnableConfigServer注解
config-client：
1. 添加项目依赖包:spring-cloud-starter-config, spring-cloud-starter-eureka, spring-retry, spring-cloud-starter-bus-amqp, spring-boot-starter-actautor, 想依赖pom.xml文件内容如下：<?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.springcloud</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>2.0.0.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>
<spring-cloud.version>Finchley.M8</spring-cloud.version>
</properties>

<dependencies>
<!--<dependency>-->
<!--<groupId>org.springframework.cloud</groupId>-->
<!--<artifactId>spring-cloud-starter-netflix-eureka-server</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>
<version>1.5.9.RELEASE</version>
</dependency>

<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-eureka</artifactId>
<version>1.4.3.RELEASE</version>
</dependency>

<dependency>
<groupId>org.springframework.retry</groupId>
<artifactId>a</artifactId>
</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>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-aop</artifactId>
</dependency>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>

<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</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>2. 编写配置文件application.properties:spring.application.name=config-client #这里名称需要与子服务名称以及读取的配置文件库中文件名称一致
spring.cloud.config.label=master #git仓库分支名称
spring.cloud.config.profile=dev #开发文件，本例子中读取的配置文件为 config-client-dev.properties
spring.cloud.bus.refresh.enabled=true #开启总线消息更新功能

eureka.client.service-url.defaultZone=http://localhost:8889/eureka/ #eureka服务注册中心IP
eureka.cloud.config.discovery.enabled=true
eureka.cloud.config.discovery.serviceId=config-server #分布式服务注册服务ID名称
server.port=8881 #服务端口

#rabbitmq相关配置
spring.rabbitmq.host=localhost
spring.rabbitmq.port=5672
spring.rabbitmq.username=guest
spring.rabbitmq.password=guest
#重点：在spring boot 2.0版本中一定要修改此配置，可以选择【"health","mappings","bus-refresh"】三种选项暴露那些端点，
management.endpoints.web.exposure.include=*
3. 在application入口处添加@RefreshScope注解，注意无论spring boot 2.0 还是1.x都需要添加该注解，否则无法生效@SpringBootApplication
@RestController
@RefreshScope
public class ConfigClientApplication {

public static void main(String[] args) {
SpringApplication.run(ConfigClientApplication.class, args);
}

@Value("${foo}") //读取的配置文件中的foo参数
String foo;

@RequestMapping(value = "/hi")
public String hi() {
return foo;
}
}此时一次运行eurekaServer， config-server, config-client 项目，则可以读取到配置文件中的相应参数。
此时修改git仓库中的config-client-dev.properties中的foo参数，并且发送post请求：http://localhost:8881/actuator/bus-refresh. 如果是1.x版本，post请求为：http://localhost:8881/bus/refresh
重新刷新请求：http://localhost:8881/hi，可以看到项目不用重新启动就可以读取新的文件配置。