6、如何获取配置中心的配置

如何获取配置中心的配置

在《配置中心》这一篇博文里学习了如何git获取配置文件。大概的流程可以用下图来概括。

《配置中心》这篇博文说的是Config Server，本篇将和大家看看如何编写一个Config Client从Config Server获取配置。

1、先在仓库中创建如下配置文件（具体参考下面地址）

https://gitee.com/hjj520/spring-cloud-2.x/tree/master/config-repos/sc-config-client

2、创建maven项目sc-config-client，对应的pom.xml如下

<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 http://maven.apache.org/xsd/maven-4.0.0.xsd">

   <modelVersion>4.0.0</modelVersion>

 

   <groupId>spring-cloud</groupId>

   <artifactId>sc-config-client</artifactId>

   <version>0.0.1-SNAPSHOT</version>

   <packaging>jar</packaging>

 

   <name>sc-config-client</name>

   <url>http://maven.apache.org</url>

 

   <parent>

      <groupId>org.springframework.boot</groupId>

      <artifactId>spring-boot-starter-parent</artifactId>

      <version>2.0.4.RELEASE</version>

   </parent>

 

   <dependencyManagement>

      <dependencies>

        <dependency>

           <groupId>org.springframework.cloud</groupId>

           <artifactId>spring-cloud-dependencies</artifactId>

           <version>Finchley.RELEASE</version>

           <type>pom</type>

        </dependency>

 

      </dependencies>

   </dependencyManagement>

 

   <properties>

      <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

      <maven.compiler.source>1.8</maven.compiler.source>

      <maven.compiler.target>1.8</maven.compiler.target>

   </properties>

   <dependencies>

 

      <dependency>

        <groupId>org.springframework.cloud</groupId>

        <artifactId>spring-cloud-starter-config</artifactId>

        <version>2.0.1.RELEASE</version>

      </dependency>

 

      <!--

      <dependency>

        <groupId>org.springframework.cloud</groupId>

        <artifactId>spring-cloud-config-client</artifactId>

        <version>2.0.1.RELEASE</version>

      </dependency>

       -->

 

      <dependency>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter-web</artifactId>

      </dependency>

 

      <dependency>

        <groupId>org.springframework.cloud</groupId>

         <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>

        <version>2.0.1.RELEASE</version>

      </dependency>

 

   </dependencies>

</project>

其中：spring-cloud-starter-config与spring-cloud-config-client可以二选一，但是根据选择的依赖不同对应的配置文件有些许不一样。spring-cloud-starter-config已经包含spring-cloud-config-client，所以选择依赖spring-cloud-starter-config。

3、创建配置文件bootstrap.yml

#服务端口

server:

  port: 8200

eureka:

  client:

    serviceUrl:

      defaultZone: http://localhost:5001/eureka/

spring:

  application:

    name: sc-config-client

  cloud:

    config:

      label: master # 配置文件所在分支

      #uri: http://127.0.0.1:8100/  #配置服务中心

      profile: dev  # dev根据具体情况来修改

      discovery:

        serviceId: sc-config-server #配置服务实例名称

        enabled: true  #开启配置服务发现

备注：sc-config-server为配置服务实例名称，对应sc-config-server项目的bootstrap.yml配置文件的如下配置项

4、创建启动类ConfigClientApplication.java

package sc.config.client;

 

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

//import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

 

@SpringBootApplication

//@EnableDiscoveryClient

@EnableEurekaClient

public class ConfigClientApplication {

 

   public static void main(String[] args) {

      SpringApplication.run(ConfigClientApplication.class, args);

   }

}

5、为了验证是否能不能在config server获取到配置项，创建一个restful类型的controller：ConfigController.java

package sc.config.client.controller;

 

import java.util.HashMap;

import java.util.Map;

 

import org.springframework.beans.factory.annotation.Value;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RestController;

 

@RestController

public class ConfigController {

 

   // git配置文件里的key

   @Value("${jdbc.driverClassName}")

    private String driverClassName;

  

   @Value("${jdbc.url}")

    private String url;

  

   @Value("${jdbc.username}")

    private String username;

  

   @Value("${jdbc.password}")

    private String password;

  

   @RequestMapping(value="/config/getValue")

   public Map<String, Object> getConfigFromGit() {

      Map<String, Object> result = new HashMap<String, Object>();

      result.put("code", "000000");

      result.put("msg", "ok");

      Map<String, Object> body = new HashMap<String, Object>();

      body.put("driverClassName", driverClassName);

      body.put("url", url);

      body.put("username", username);

      body.put("password", password);

      result.put("body", body);

      return result;

   }

 

}