1.spring cloud config是什么

　　官网：https://cloud.spring.io/spring-cloud-static/spring-cloud-config/2.2.1.RELEASE/reference/html/

　　Spring Cloud Config项目是一个解决分布式系统的配置管理方案。它包含了Client和Server两个部分，server提供配置文件的存储、以接口的形式将配置文件的内容提供出去，client通过接口获取数据、并依据此数据初始化自己的应用

　　

2.使用

　　实际使用过程中，我们把配置文件放在git上面，创建一个config的server端，实时同步git上的配置文件。再把配置文件的内容以接口的形式提供除去。client去获取server的配置数据。

2.1在git上创建一个项目

　　里面放入配置文件，我这里有三个配置文件。注意文件的命名格式。

 

2.2创建一个模块作为server

2.2.1 依赖

<dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-config-server</artifactId>

 </dependency>

完整依赖

<dependencies>

        <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>com.atguigu.springcloud</groupId>

            <artifactId>cloud-api-commons</artifactId>

            <version>${project.version}</version>

        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-web</artifactId>

        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web  -->

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-actuator</artifactId>

        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-devtools -->

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-devtools</artifactId>

            <scope>runtime</scope>

            <optional>true</optional>

        </dependency>

        <!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->

        <dependency>

            <groupId>org.projectlombok</groupId>

            <artifactId>lombok</artifactId>

            <optional>true</optional>

        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-test -->

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-test</artifactId>

            <scope>test</scope>

        </dependency>

    </dependencies>

2.2.2配置文件

server:

  port: 3344

eureka:

  client:

    service-url:

      defaultZone: http://eureka7001.com:7001/eureka,http://eureka7002.com:7002/eureka  #集群版

spring:

  application:

    name: config-server

  cloud:

    config:

      server:

        git:

          uri: https://gitee.com/xxx/sprincloud-config.git #git仓库路径

          search-paths:

            - springcloud-config  #搜索路径

          username: xx

          password: xxx

      label: master
cloud.config.server.git：
　　uri：配置文件项目的git的地址
　　searc-paths：搜索路径，如下图
　　

　　　　username：git用户名

　　　　 password：git密码

　　label：分支，如下图

　　　　

 2.2.3主启动类

　　注解 @EnableConfigServer

package com.atguigu.springcloud;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.cloud.config.server.EnableConfigServer;

import org.springframework.cloud.netflix.hystrix.EnableHystrix;

@SpringBootApplication

@EnableConfigServer

public class ConfigCenterMain3344 {

    public static void main(String[] args) {

        SpringApplication.run(ConfigCenterMain3344.class,args);

    }

}

2.2.4测试

　　访问三个配置文件，都访问到了

　　

　

2.3创建一个client端-也就是需要使用server端配置内容的服务

2.3.1pom文件

 <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-config</artifactId>

        </dependency>

完整依赖

<dependencies>

        <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>com.atguigu.springcloud</groupId>

            <artifactId>cloud-api-commons</artifactId>

            <version>${project.version}</version>

        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-web</artifactId>

        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web  -->

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-actuator</artifactId>

        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-devtools -->

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-devtools</artifactId>

            <scope>runtime</scope>

            <optional>true</optional>

        </dependency>

        <!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->

        <dependency>

            <groupId>org.projectlombok</groupId>

            <artifactId>lombok</artifactId>

            <optional>true</optional>

        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-test -->

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-test</artifactId>

            <scope>test</scope>

        </dependency>

    </dependencies>

2.3.2配置文件

　　注意文件名称为：bootstrap.yml
　　
server:

  port: 3355

eureka:

  client:

    service-url:

      defaultZone: http://eureka7001.com:7001/eureka,http://eureka7002.com:7002/eureka  #集群版

spring:

  application:

    name: config-client

  cloud:

    config:

      label: master #分支名称

      name: config #配置文件名称

      profile: dev #读取配置文件的后缀名称

      uri: http://localhost:3344 #这几个组合就是 http://localhost:3344/master/config-dev.yml

cloud.config:
　　label 分支名称
　　name 配置文件名称
　　profile 配置文件后缀名称
　　uri：server地址
这几个配置合起来就是： http://localhost:3344/master/config-dev.yml

2.3.3 主启动类
　　
package com.atguigu.springcloud;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@SpringBootApplication

@EnableEurekaClient

public class ConfigCenterMain3355 {

    public static void main(String[] args) {

        SpringApplication.run(ConfigCenterMain3355.class,args);

    }

}


2.3.4 业务类




package com.atguigu.springcloud.controller;

import com.atguigu.springcloud.entities.CommonResult;

import com.atguigu.springcloud.entities.Payment;

import lombok.extern.slf4j.Slf4j;

import org.springframework.beans.factory.annotation.Value;

import org.springframework.cloud.client.ServiceInstance;

import org.springframework.cloud.client.discovery.DiscoveryClient;

import org.springframework.cloud.context.config.annotation.RefreshScope;

import org.springframework.web.bind.annotation.*;

import javax.annotation.Resource;

import java.util.List;

import java.util.concurrent.TimeUnit;

@RestController

@Slf4j

public class PaymentController {

    @Value("${config.info}")

    private String configInfo;  //这里config.info是读取配置中心的配置

    @GetMapping("/configInfo")

    public String getConfigInfo(){

    return configInfo;

     }

}




　　


 2.3.5测试


　　表示配置读取成功




2.4若git上配置文件发生变化


2.4.1在git上修改config-dev的内容




 2.4.2访问server


　　自动完成同步




 2.4.3访问client


　　没有自动同步，只有重启client才完成同步




2.5自动同步配置


2.5.1在client加入依赖，加入actuator监控


　　前面已经添加了




 <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-actuator</artifactId>

        </dependency>




2.5.2配置文件


加入以下配置，暴露监控端点




management:

  endpoints:

    web:

      exposure:

        include: "*"




完整




server:

  port: 3355

eureka:

  client:

    service-url:

      defaultZone: http://eureka7001.com:7001/eureka,http://eureka7002.com:7002/eureka  #集群版

spring:

  application:

    name: config-client

  cloud:

    config:

      label: master #分支名称

      name: config #配置文件名称

      profile: dev #读取配置文件的后缀名称

      uri: http://localhost:3344 #这几个组合就是 http://localhost:3344/master/config-dev.yml

#暴露监控端点

management:

  endpoints:

    web:

      exposure:

        include: "*"




2.5.3在业务类加入注解@RefreshScope - 刷新配置




package com.atguigu.springcloud.controller;

import com.atguigu.springcloud.entities.CommonResult;

import com.atguigu.springcloud.entities.Payment;

import lombok.extern.slf4j.Slf4j;

import org.springframework.beans.factory.annotation.Value;

import org.springframework.cloud.client.ServiceInstance;

import org.springframework.cloud.client.discovery.DiscoveryClient;

import org.springframework.cloud.context.config.annotation.RefreshScope;

import org.springframework.web.bind.annotation.*;

import javax.annotation.Resource;

import java.util.List;

import java.util.concurrent.TimeUnit;

@RestController

@Slf4j

@RefreshScope //刷新配置

public class PaymentController {

    @Value("${config.info}")

    private String configInfo;

    @GetMapping("/configInfo")

    public String getConfigInfo(){

    return configInfo;

     }

}




2.5.4在修改配置文件后，需向client发送一个POST请求


　　http://localhost:3355/actuator/refresh


2.5.5测试


修改配置文件


　　


发送post请求




访问server，配置内容已更新




访问client，配置内容已更新




2.6还存在的缺陷


　　每次修改配置都需要向client发送post请求，如果存在多个client，就比较麻烦。这里就用到spring cloud bus。config和bus是相互配合的好搭档，一般都是一起使用。


 3.使用spring cloud bus


3.1基本说明


　　Spring Cloud Bus 对自己的定位是 Spring Cloud 体系内的消息总线，使用 message broker 来连接分布式系统的所有节点。


　　bus有两种通知方式


　　方式1：


　　　　bus通知一个client，再有client把消息通知给其他client




　　方式2：


　　bus通知config的server端，再由server端通知client




方式二的架构显然更加合适，方式一不适合的原因如下：


　　打破了微服务的职责单一性，因为微服务本身是业务模块，它本不应该承担配置刷新职责


　　破坏了微服务各节点的对等性


　　有一定的局限性。例如，微服务在迁移时，它的网络地址常常会发生变化，此时如果想要做到自动刷新，那就会增加更多的修改


所以我们采取方式二


3.1环境准备


　　spring cloud bus不需具备Rabbitmq或者kafka


　　　RabbitMq安装：https://www.cnblogs.com/jthr/p/13786746.html


3.2修改cloud-config-center-3344


3.2.1 添加依赖




<dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-bus-amqp</artifactId>

        </dependency>




完整




<dependencies>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-config-server</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-bus-amqp</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>

        </dependency>

        <dependency>

            <groupId>com.atguigu.springcloud</groupId>

            <artifactId>cloud-api-commons</artifactId>

            <version>${project.version}</version>

        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-web</artifactId>

        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web  -->

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-actuator</artifactId>

        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-devtools -->

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-devtools</artifactId>

            <scope>runtime</scope>

            <optional>true</optional>

        </dependency>

        <!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->

        <dependency>

            <groupId>org.projectlombok</groupId>

            <artifactId>lombok</artifactId>

            <optional>true</optional>

        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-test -->

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-test</artifactId>

            <scope>test</scope>

        </dependency>

    </dependencies>




3.2.2配置文件添加




  rabbitmq:

    host: localhost  #rabbitmq地址

    port: 5672      #端口

    username: guest #账号

    password: guest #密码

management:   #暴露bus刷新的端点

  endpoints:

    web:

      exposure:

        include: bus-refresh




完整




server:

  port: 3344

eureka:

  client:

    service-url:

      defaultZone: http://eureka7001.com:7001/eureka,http://eureka7002.com:7002/eureka  #集群版

spring:

  application:

    name: config-server

  cloud:

    config:

      server:

        git:

          uri: https://gitee.com/xxx/sprincloud-config.git #git仓库路径

          search-paths:

            - springcloud-config  #搜索路径

          username: xxx

          password: xxx

      label: master

  rabbitmq:

    host: localhost  #rabbitmq地址

    port: 5672      #端口

    username: guest #账号

    password: guest #密码

management:   #暴露bus刷新的端点

  endpoints:

    web:

      exposure:

        include: bus-refresh




3.3修改cloud-config-client-3355


3.3.1添加依赖




<dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-bus-amqp</artifactId>

        </dependency>




完整




<dependencies>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-config</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-bus-amqp</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-bus-amqp</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>

        </dependency>

        <dependency>

            <groupId>com.atguigu.springcloud</groupId>

            <artifactId>cloud-api-commons</artifactId>

            <version>${project.version}</version>

        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-web</artifactId>

        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web  -->

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-actuator</artifactId>

        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-devtools -->

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-devtools</artifactId>

            <scope>runtime</scope>

            <optional>true</optional>

        </dependency>

        <!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->

        <dependency>

            <groupId>org.projectlombok</groupId>

            <artifactId>lombok</artifactId>

            <optional>true</optional>

        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-test -->

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-test</artifactId>

            <scope>test</scope>

        </dependency>

    </dependencies>




3.3.2配置文件添加




  rabbitmq:

    host: localhost

    port: 5672

    username: guest

    password: guest




完整




server:

  port: 3355

eureka:

  client:

    service-url:

      defaultZone: http://eureka7001.com:7001/eureka,http://eureka7002.com:7002/eureka  #集群版

spring:

  application:

    name: config-client

  cloud:

    config:

      label: master #分支名称

      name: config #配置文件名称

      profile: dev #读取配置文件的后缀名称

      uri: http://localhost:3344 #这几个组合就是 http://localhost:3344/master/config-dev.yml

  rabbitmq:

    host: localhost

    port: 5672

    username: guest

    password: guest

#暴露监控端点

management:

  endpoints:

    web:

      exposure:

        include: "*"




3.4新建cloud-config-client-3366


　　前面有了cloud-config-client-3355，这里新建一个3366，这样子就有两个client，演示效果更好。


　　 3366和3355内容除了端口号，其它一模一样


3.4.1新建




3.4.2pom文件依赖




<dependencies>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-config</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-bus-amqp</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>

        </dependency>

        <dependency>

            <groupId>com.atguigu.springcloud</groupId>

            <artifactId>cloud-api-commons</artifactId>

            <version>${project.version}</version>

        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-web</artifactId>

        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web  -->

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-actuator</artifactId>

        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-devtools -->

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-devtools</artifactId>

            <scope>runtime</scope>

            <optional>true</optional>

        </dependency>

        <!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->

        <dependency>

            <groupId>org.projectlombok</groupId>

            <artifactId>lombok</artifactId>

            <optional>true</optional>

        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-test -->

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-test</artifactId>

            <scope>test</scope>

        </dependency>

    </dependencies>




3.4.3配置文件


名字：bootstrap.yml




server:

  port: 3366

eureka:

  client:

    service-url:

      defaultZone: http://eureka7001.com:7001/eureka,http://eureka7002.com:7002/eureka  #集群版

spring:

  application:

    name: config-client

  cloud:

    config:

      label: master #分支名称

      name: config #配置文件名称

      profile: dev #读取配置文件的后缀名称

      uri: http://localhost:3344 #这几个组合就是 http://localhost:3344/master/config-dev.yml

  rabbitmq:

    host: localhost

    port: 5672

    username: guest

    password: guest

#暴露监控端点

management:

  endpoints:

    web:

      exposure:

        include: "*"




3.4.4主启动类




package com.atguigu.springcloud;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@SpringBootApplication

@EnableEurekaClient

public class ConfigCenterMain3366 {

    public static void main(String[] args) {

        SpringApplication.run(ConfigCenterMain3366.class,args);

    }

}




3.4.5业务类




package com.atguigu.springcloud.controller;

import lombok.extern.slf4j.Slf4j;

import org.springframework.beans.factory.annotation.Value;

import org.springframework.cloud.context.config.annotation.RefreshScope;

import org.springframework.web.bind.annotation.GetMapping;

import org.springframework.web.bind.annotation.RestController;

@RestController

@Slf4j

@RefreshScope //刷新配置

public class PaymentController {

    @Value("${config.info}")

    private String configInfo;

    @GetMapping("/configInfo")

    public String getConfigInfo(){

    return configInfo;

     }

}




3.5测试


　　启动项目


3.5.1访问


　　 访问server3344


　　


　　访问3355


　　


　　访问3366




3.5.3修改git上的配置文件




3.5.4发送POST请求


http://localhost:3344/actuator/bus-refresh




3.5.5再次访问


　　配置内容已经自动更新








 3.5.6说明


　　上面的测试说明，在修改git上配置文件后，只需要发送一次POST请求到server，所有的client会更新配置文件内容。这样子就不用去对每个client端发送POST请求了。


3.6差异化通知


　　如果我们只需要部分client更新而不是全部client更新，该怎么做，只需要对发送的POST请求进行修改


3.5.1修改git上配置文件




3.5.2发送POST请求


http://localhost:3344/actuator/bus-refresh/config-client:3355


config-client：微服务名称   3355：端口号






3.5.3再次访问








server3344和client3355都更新了，client3366没有更新




 
												


																

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