Spring Cloud Config入门（本地配置）

spring cloud config 简介

• Spring Cloud Config为分布式系统中的外部化配置提供服务器和客户端支持。使用Config Server，您可以在所有环境中管理应用程序的外部属性。
• Spring Cloud Config 分为两个部分 ，server端和client端。

server端配置服务器，管理配置信息

client端获取配置信息

创建并运行一个Spring Cloud Config Server

• 创建一个名为config-server的应用,并添加spring-cloud-starter-parent,spring-cloud-config-server依赖,pom信息具体如下

  <?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
      <modelVersion>4.0.0</modelVersion>
  
      <groupId>com.zcr.test</groupId>
      <artifactId>config-server</artifactId>
      <version>1.0-SNAPSHOT</version>
      <packaging>jar</packaging>
      <name>config-server</name>
      <description>Demo project for Spring Boot</description>
      <parent>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-parent</artifactId>
          <version>1.5.2.RELEASE</version>
      </parent>
      <properties>
          <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
          <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
          <java.version>1.8</java.version>
      </properties>
      <dependencies>
          <dependency>
              <groupId>org.springframework.cloud</groupId>
              <artifactId>spring-cloud-config-server</artifactId>
          </dependency>
  
          <dependency>
              <groupId>org.springframework.boot</groupId>
              <artifactId>spring-boot-starter-test</artifactId>
              <scope>test</scope>
          </dependency>
  
          <dependency>
              <groupId>org.springframework.cloud</groupId>
              <artifactId>spring-cloud-starter-eureka</artifactId>
          </dependency>
      </dependencies>
      <dependencyManagement>
          <dependencies>
              <dependency>
                  <groupId>org.springframework.cloud</groupId>
                  <artifactId>spring-cloud-dependencies</artifactId>
                  <version>Camden.SR6</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>

• 创建application主类，并添加@EnableConfigServer注解，代码如下

  package com.zcr.spring;
  
  import org.springframework.boot.SpringApplication;
  import org.springframework.boot.autoconfigure.SpringBootApplication;
  import org.springframework.cloud.config.server.EnableConfigServer;
  
  @SpringBootApplication
  @EnableConfigServer
  public class ConfigServerApplication {
      public static void main(String[] args) {
          SpringApplication.run(ConfigServerApplication.class,args);
      }
  }

• 在本地创建一个配置文件db-service-dev.properties，格式如下

  sck.type=sck
  sck.url=jdbc:oracle:thin:@10.1.50.205:1521:orcl
  sck.class=oracle.jdbc.driver.OracleDriver
  sck.user=sddb
  sck.password=sddb
  eom.type=eom
  eom.url=jdbc:oracle:thin:@10.1.50.205:1521:orcl
  eom.class=oracle.jdbc.driver.OracleDriver
  eom.user=eom
  eom.password=eom

• 在resources文件夹下创建application.properties，内容如下

  #tomcat端口号
  server.port=8888
  #配置文件在本地
  spring.profiles.active=native
  #配置文件的目录
  spring.cloud.config.server.native.search-locations=D:/workspace/GitHub/spring-config/config-file

  目录结构：

• 运行应用并打开网址http://localhost:8888/db-service/dev，出现如下页面，证明配置文件发布成功

创建并运行一个Spring Cloud Config Client

• 创建一个名为config-client的应用,并添加spring-cloud-starter-parent,spring-cloud-starter-config,spring-boot-starter-web依赖,pom信息具体如下

  <?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
      <modelVersion>4.0.0</modelVersion>
  
      <groupId>com.zcr.spring</groupId>
      <artifactId>config-client</artifactId>
      <version>1.0-SNAPSHOT</version>
      <parent>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-parent</artifactId>
          <version>1.5.2.RELEASE</version>
      </parent>
      <properties>
          <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
          <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
          <java.version>1.8</java.version>
      </properties>
      <dependencies>
          <dependency>
              <groupId>org.springframework.cloud</groupId>
              <artifactId>spring-cloud-starter-config</artifactId>
          </dependency>
  
          <dependency>
              <groupId>org.springframework.boot</groupId>
              <artifactId>spring-boot-starter-web</artifactId>
          </dependency>
  
          <dependency>
              <groupId>org.springframework.boot</groupId>
              <artifactId>spring-boot-starter-test</artifactId>
              <scope>test</scope>
          </dependency>
      <dependencyManagement>
          <dependencies>
              <dependency>
                  <groupId>org.springframework.cloud</groupId>
                  <artifactId>spring-cloud-dependencies</artifactId>
                  <version>Dalston.RC1</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>
  
      <repositories>
          <repository>
              <id>spring-milestones</id>
              <name>Spring Milestones</name>
              <url>https://repo.spring.io/milestone</url>
              <snapshots>
                  <enabled>false</enabled>
              </snapshots>
          </repository>
      </repositories>
  
  </project>

• 在resources中创建bootstrap.properties（bootstrap.yml会在应用启动之前读取），格式如下

  #文件名
  spring.application.name=db-service
  #文件模式，默认为default
  spring.cloud.config.profile=dev
  #server端ip地址
  spring.cloud.config.uri= http://localhost:8888/
  #client端ip端口
  server.port=8881

• 创建一个controller

  package com.zcr.spring;
  
  import org.springframework.beans.factory.annotation.Value;
  import org.springframework.boot.SpringApplication;
  import org.springframework.boot.autoconfigure.SpringBootApplication;
  import org.springframework.web.bind.annotation.RequestMapping;
  import org.springframework.web.bind.annotation.RestController;
  
  @SpringBootApplication
  @RestController
  public class ConfigClientApplication {
      public static void main(String[] args) {
          SpringApplication.run(ConfigClientApplication.class, args);
      }
      @Value("${sck.user}")
      String sckUser;
      @Value("${sck.password}")
      String sckPassword;
  
      @RequestMapping("/hello")
      public String showUserAndPassword(){
          String sb = "username is " + sckUser + "," + "password is " +sckPassword;
          return sb;
      }
  }

• 启动Application，并访问http://localhost:8881/hello，出现如下界面，成功

遗留问题：1.初始化时，注入在static代码块之后，故静态代码块无法获取远程配置信息。

2.对spring了解浅。不懂内部原理，bug调试过程中比较费劲。

3.对spring中的注解不了解。

源码地址：https://github.com/310834626/spring-cloud-config

参考：http://www.jianshu.com/p/69dea19abf04

http://blog.didispace.com/springcloud4/

http://tech.lede.com/2017/06/12/rd/server/springCloudConfig/