springcloud11 spring cloud config

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;
     }
}