《springcloud 三》分布式配置中心

Git环境搭建

使用码云环境搭建git服务器端 

码云环境地址:https://gitee.com/majie2018

服务端详解

项目名称:springboot2.0-config_server

Maven依赖信息

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.1.RELEASE</version>
    </parent>
    <!-- 管理依赖 -->
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Finchley.M7</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>
    <dependencies>
        <!--spring-cloud 整合 config-server -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-config-server</artifactId>
        </dependency>
        <!-- SpringBoot整合eureka客户端 -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>

    </dependencies>
    <!-- 注意： 这里必须要添加， 否者各种依赖有问题 -->
    <repositories>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/libs-milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>

application.yml配置

###服务注册到eureka地址
eureka:
  client:
    service-url:
           defaultZone: http://localhost:8100/eureka
spring:
  application:
    ####注册中心应用名称
    name: config-server
  cloud:
    config:
      server:
        git:
          ###git环境地址
          uri: https://gitee.com/itmayi/config.git
          ####搜索目录
          search-paths:
            - config  
      ####读取分支      
      label: master
####端口号      
server:
  port: 8888

项目启动

@EnableConfigServer
@SpringBootApplication
public class ConfigServerApplication {
    public static void main(String[] args) {
        SpringApplication.run(ConfigServerApplication.class, args);
    }
}

@EnableConfigServer 开启分布式配置中心服务器端

读取配置文件信息 http://127.0.0.1:8888/config-client-dev.properties

客户端详解

项目名称:springboot2.0-config_client

Maven依赖信息

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.1.RELEASE</version>
    </parent>
    <!-- 管理依赖 -->
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Finchley.M7</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>

        </dependencies>
    </dependencyManagement>
    <dependencies>
        <!-- SpringBoot整合Web组件 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-config-client</artifactId>
        </dependency>
        <!-- SpringBoot整合eureka客户端 -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
    </dependencies>
    <!-- 注意： 这里必须要添加， 否者各种依赖有问题 -->
    <repositories>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/libs-milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>

bootstrap.yml

spring:
  application:
    ####注册中心应用名称
    name:  config-client
  cloud:
    config:
    ####读取后缀
      profile: dev
      ####读取config-server注册地址
      discovery:
        service-id: config-server
        enabled: true
#####    eureka服务注册地址    
eureka:
  client:
    service-url:
           defaultZone: http://localhost:8100/eureka    
server:
  port: 8882

读取配置文件

@RestController
public class IndexController {
    @Value("${name}")
    private String name;

    @RequestMapping("/name")
    private String name() {
        return name;
    }

}

动态刷新数据

在SpringCloud中有手动刷新配置文件和实时刷新配置文件两种方式。

手动方式采用actuator端点刷新数据

实时刷新采用SpringCloud Bus消息总线

actuator端点刷新数据

Maven依赖信息

<!-- actuator监控中心 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

Bootstrap.xml新增

开启监控断点

management:
  endpoints:
    web:
      exposure:
        include: "*"

生效前提

在需要刷新的Bean上添加@RefreshScope注解。

@RestController
// @SpringBootApplication
@RefreshScope
public class ConfigClientController {

http://127.0.0.1:8882/actuator/refresh 
    @Value("${itmayieduInfo}")
    private String itmayieduInfo;

当配置更改时，标有@RefreshScope的Bean将得到特殊处理来生效配置

手动刷新接口

Post请求手动刷新

http://127.0.0.1:8882/actuator/refresh  启动刷新器 从cofnig server读取

实际项目中一般都采用手动刷新，  基于bus总线的实时刷新太占内存，消耗cpu