Spring Cloud Config配置

线上环境，修改配置，动态加载是刚需。本节我将记录下如何运用Spring Cloud Config动态加载服务所需的配置，实现热加载的功能。

前期准备

Config 服务前期准备

Spring Cloud Config需要 git或者svn 作为配置的存储之处。我在 git 上建立了一个Config-Repo的工程，如下图：

这里需要了解一下，Spring boot启动时加载文件的顺序问题

具体可参考：翟永超的《Spring Cloud 微服务实战》一书，第25页。

其中 newproduct.yml 配置为：

spring:
  profiles:
    active: dev

newproduct-dev.yml 为：

#server
server:
  port: 9005
#spring
spring:
  application:
    name: newproduct
  datasource:
    name: SpringCloudSell
    type: com.alibaba.druid.pool.DruidDataSource
    #druid
    druid:
      filters: stat
      driver-class-name: com.mysql.jdbc.Driver
      url: jdbc:mysql://localhost:3306/SpringCloudSell?useUnicode=true&characterEncoding=utf-8&zeroDateTimeBehavior=convertToNull&useSSL=false
      username: zyx
      password: zyx
      initial-size: 1
      min-idle: 1
      max-active: 20
      max-wait: 60000
      time-between-eviction-runs-millis: 60000
      min-evictable-idle-time-millis: 300000
      validation-query: SELECT 'x'
      test-while-idle: true
      test-on-borrow: false
      test-on-return: false
      pool-prepared-statements: false
      max-pool-prepared-statement-per-connection-size: 20

#mybatis
mybatis:
  mapper-locations: classpath:mapping/*.xml
  type-aliases-package: com.taeyeon

#logging
logging:
  level:
    com.taeyeon.category.dao: debug
    com.taeyeon.info.dao: debug
    
#test
girl:
  name: zwy
  age: 23
  
#boy
boy:
  name: zyx
  age: 18

Config服务配置

1. pom 文件需要引入依赖：

<dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-config-server</artifactId>
            <version>2.0.1.RELEASE</version>
        </dependency>

2. 启动类需要注解 @EnableConfigServer

@SpringBootApplication
@EnableEurekaClient
@EnableConfigServer
public class ConfigApplication {
    public static void main(String[] args) {
        System.out.println("++++++++++++++++++++++ConfigApplication Start+++++++++++++++++++++++++");
        SpringApplication.run(ConfigApplication.class, args);
        System.out.println("======================ConfigApplication Start is Done=========================");
    }
}

3. application.yml 配置

server:
  port: 9001
#spring
spring:
  application:
    name: config

#uri 填写Config-Repo的 github 地址；username和 Password 则填写你的 github的用户名和密码
  cloud:
    config:
      server:
        git:
          uri: xxxx
          username: xxxx
          password: xxxx
#eureka
eureka:
  client:
    service-url:
      defaultZone: http://peers1:9010/eureka/,http://peers0:9009/eureka/
    fetch-registry: true
    register-with-eureka: true
  instance:
    instance-id: ${spring.application.name}:${spring.application.instance_id:${server.port}}

#这里需要消息队列，实现将配置的更改信息推送到消息对列，然后消费者从消息队列中获取配置信息。
rabbitmq:
  addresses: localhost
  port: 15672
  username: guest
  password: guest

#主要用于开启refresh 功能
management:
  endpoints:
    web:
      exposure:
        include: "*"

至此，config 服务配置完毕，接下来配置config-client：newproduct服务。

newproduct服务配置

1. pom 依赖

<!-- RabbitMQ-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-bus-amqp</artifactId>
            <version>2.0.0.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-config-client</artifactId>
            <version>2.0.1.RELEASE</version>
        </dependency>

2. bootstrap.yml 配置
   由于 newproduct需要从 config服务中拉去配置信息，因此 newproduct本地配置 bootstrap.yml，且它的加载优先级高于application.yml。

#spring
spring:
  application:
    name: newproduct
  cloud:
    config:
      discovery:
        enabled: true
        service-id: CONFIG
      profile: dev

rabbitmq:
  addresses: localhost
  port: 15672
  username: guest
  password: guest

  #Eureka Server
eureka:
  client:
    service-url:
      defaultZone: http://peers0:9009/eureka/,http://peers1:9010/eureka/
    register-with-eureka: true
    fetch-registry: true
  instance:
    instance-id: ${spring.application.name}:${spring.application.instance_id:${server.port}}

待续…