SpringCloud之七config(配置服务中心)-优快云博客

简介

在分布式系统中，由于服务数量巨多，为了方便服务配置文件统一管理，实时更新，所以需要分布式配置中心组件。在Spring Cloud中，有分布式配置中心组件spring cloud config ，它支持配置服务放在配置服务的内存中（即本地），也支持放在远程Git仓库中。

新建config-server

引入相关依赖

 <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>
</dependencies>

新建bootstrap.yml

server:
  port: 8899

spring:
  application:
    name: config-server
  cloud:
    config:
      server:
        git:
          uri: https://github.com/felixjee/SpringCloudConfig.git
          password:
          username:
          default-label: master
          search-paths:


eureka:
  instance:
    prefer-ip-address: true
    instance-id: ${spring.application.name}:${server.port}
  client:
    service-url:
      defaultZone: http://localhost:8761/eureka/

spring.cloud.config.server.git.uri：配置git仓库地址
spring.cloud.config.server.git.search-paths：配置仓库路径
spring.cloud.config.default-label：配置仓库的分支
spring.cloud.config.server.git.username：访问git仓库的用户名
spring.cloud.config.server.git.password：访问git仓库的用户密码

启动类


import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.config.server.EnableConfigServer;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

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

在github Create a new repository 取名SpringCloudConfig
创建userservice-dev.yml 文件并上传到github SpringCloudConfig项目中


user: user1
server:
  port: 8789

spring:
  application:
    name: config-client:${server.port}

访问http://localhost:8899/userservice/dev

config-server
可以看到已经从远程获取到配置信息

http请求地址和资源文件映射如下:

/{application}/{profile}[/{label}]
/{application}-{profile}.yml
/{label}/{application}-{profile}.yml
/{application}-{profile}.properties
/{label}/{application}-{profile}.properties

新建config client

引入相关依赖

   <dependencies>
    <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-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-config-client</artifactId>
    </dependency>
</dependencies>

bootstarp.yml

spring:
  application:
    name: config-client
  cloud:
    config:
      label: master  #对应git的分支。如果配置中心使用的是本地存储，则该参数无用
      profile: dev  #对应{profile}部分
      name: userservice  #对应{application}部分
      #单个配置
      uri: http://localhost:8888/

     
eureka:
  client:
    service-url:
      defaultZone: http://localhost:8761/eureka/
  instance:
    instance-id: ${spring.application.name}:${server.port}
    prefer-ip-address: true

新建controller 测试

import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class TestController {
    @Value("${user}")
    private String user;
    @Value("${server.port}")
    private String port;
    @GetMapping
    public String user(){
        return "user: "+user+" port: "+port;
    }
}

访问 http://localhost:8789/
显示结果如下：

user: user1 port: 8789

说明成功通过配置中心获取到配置信息

刷新

config-client引入

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

config-client application.yml 添加

management:
  #refresh接入点显式暴露出来
  endpoints:
    web:
      exposure:
        include: refresh,health,info,bus-refresh #指定监控项。默认开启了health、info。我们这里加入了refresh
      base-path: /actuator # 用于指定actuator的URL路径。1.X默认是/，2.X默认是/actuator
  endpoint:
    health:
      show-details: always # 用于展示监控项详细信息，默认不展示
  server:
    port: 8988 #用于指定actuator端口。如果不指定则与系统服务端口一致，建议修改