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spring-cloud 配置中心config

配置中心简介

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。

创建server

1.pom.xml

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.5.2</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>config-server</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>config-server</name>
    <description>Demo project for Config Server</description>
    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>2020.0.3</spring-cloud.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <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>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>
​
</project>
​

添加测试文件config-client-dev.yml和config-client-dev.yml

config-client-dev.yml

hello: hello from config-test-dev

config-client-pro.yml

hello: hello from config-test-pro

yml配置

#port
server:
  port: 8501
#name
spring:
  application:
    name: config-server
  #配置yml的git路径
  cloud:
    config:
      server:
        git:
          uri: xxx
          username: xxx
          password: xxx
eureka:
  instance:
    prefer-ip-address: true
    instance-id: ${spring.cloud.client.ip-address}:${server.port}
    lease-renewal-interval-in-seconds: 30
    lease-expiration-duration-in-seconds: 90
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka

启动类添加两个注解@EnableConfigServer和@EnableDiscoveryClient

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

创建client

目录结构

pom.xml

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.5.2</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>config</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>config-client</name>
    <description>Demo project for Config</description>
    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>2020.0.3</spring-cloud.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <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>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-bootstrap</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>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-surefire-plugin</artifactId>
                <version>2.22.2</version>
                <configuration>
                    <skip>true</skip>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

添加一个bootstrap.yml,这个会优先于application.yml进行加载

bootstrap.yml

spring:
  cloud:
    config:
      name: config-client # 获取配置文件的名称
      profile: dev # 配置的策略pro-生产 test-测试 dev-开发
      label: master # 分支
      discovery:
        enabled: true # 开启配置信息发现
        service-id: config-server # 指定配置中心的service-id
eureka:
  instance:
    instance-id: ${spring.cloud.config.name}:${server.port}
  client:
    fetch-registry: true
    register-with-eureka: true
    service-url:
      defaultZone: http://localhost:8761/eureka

application.yml

server:
  port: 8502

启动类添加注解@EnableDiscoveryClient

添加一个controller

@RestController
@RequestMapping("/config-client")
public class ConfigClientController {
​
    @Value("${hello}")
    private String hello;
​
    @GetMapping("/info")
    public String info() {
​
        return this.hello;
    }
​
}

启动访问成功如图

修改bootstrap.yml中的profile属性可以配置相应分支

至此，已经配置好了config，但是修改git上的yml文件config不能刷新

client端配置，实现手动刷新

添加依赖

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

bootstrap.yml 配置

#配置刷新
management:
  endpoints:
    web:
#      默认是/actuator前缀
      base-path: /
      exposure:
#        include: "*",* 是放行所有
        include: refresh,health,info

controller添加注解@RefreshScope

测试

修改远程yml

访问接口

调用refresh后再次访问

到这里已经实现了动态刷新yml配置，但是每次刷新前都需要post调用refresh接口，这样手动刷新较为麻烦，需要进一步引入bus自动刷新配置