spring cloud config统一配置中心

spring cloud config可以用来作分布式配置中心，本质上configServer会从git / svn / 本地目录上下载到本地环境，EnvironmentController提供了一些了接口给ConfigClient启动时调用，EnvironmentController会返回本地缓存的配置文件给ConfigClient，从而实现分布式配置
具体规则可参照官网或EnvironmentController接口，个人喜好参照源码，有时文档会存在出入或羞涩

服务端配置：

spring.cloud.config.server.git.uri=https://github.com/rejoiceFromJesus/config-repo.git //git仓库位置
management.security.enabled=false//关闭安全验证
spring.cloud.config.server.git.basedir=target/config //加载到ConfigServer项目所在的本地目录的位置
spring.cloud.config.server.git.search-paths=configclient //本地目录搜索路径

因此最终访问的绝对路径是spring.cloud.config.server.git.basedir+spring.cloud.config.server.git.search-paths，这样有个缺点是不能在Client客户端指定搜索的目录

1、创建git仓库,然后创建2个配置文件

2个文件的内容分别为：

com.jiongyi.constant.active=dev

和

com.jiongyi.constant.active=test

tips:将会展现不同的环境加载不同的配置文件

2、创建父工程

pom.xml

<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.jiongyi.springboot</groupId><artifactId>jiongyi-springboot</artifactId><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>1.5.1.RELEASE</version></parent><version>0.0.1-SNAPSHOT</version><packaging>pom</packaging><modules><module>spring-boot-config-server</module><module>spring-boot-configclient</module></modules><properties><main.basedir>${basedir}/..</main.basedir><java.version>1.8</java.version></properties><dependencyManagement><dependencies><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-dependencies</artifactId><version>Brixton.RELEASE</version><type>pom</type><scope>import</scope></dependency></dependencies></dependencyManagement><dependencies><!-- 监控 --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-actuator</artifactId></dependency><!-- spring boot starter --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter</artifactId><exclusions><exclusion><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-logging</artifactId></exclusion></exclusions></dependency><!-- log4j2 --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-log4j2</artifactId></dependency><dependency>  <!-- 加上这个才能辨认到log4j2.yml文件 --><groupId>com.fasterxml.jackson.dataformat</groupId><artifactId>jackson-dataformat-yaml</artifactId></dependency><dependency><groupId>org.apache.logging.log4j</groupId><artifactId>log4j-nosql</artifactId> <!-- 必需，否则报错 --><version>2.7</version></dependency><!-- test --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>import</scope></dependency><!-- 配置提示 --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-configuration-processor</artifactId><optional>true</optional></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins><!-- <resources> <resource> <directory>src/main/resources</directory> <excludes> <exclude>*.properties</exclude> </excludes> </resource> </resources> --></build></project>

3、创建子工程configserver，代表服务端，负责加载配置文件到本地

pom.xml

<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><parent><groupId>com.jiongyi.springboot</groupId><artifactId>jiongyi-springboot</artifactId><version>0.0.1-SNAPSHOT</version></parent><artifactId>spring-boot-config-server</artifactId><dependencies><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-config-server</artifactId></dependency></dependencies></project>

ConfigServer.java 启动类

package com.jiongyi.springboot.configserver;import java.io.FileNotFoundException;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.config.server.EnableConfigServer;@SpringBootApplication@EnableConfigServerpublic class ConfigServer {  public static void main(String[] args) throws FileNotFoundException {    SpringApplication.run(ConfigServer.class, args);  }}

application.properties 配置文件

server.port=8888spring.cloud.config.server.git.uri=https://github.com/rejoiceFromJesus/config-repo.gitmanagement.security.enabled=falsespring.cloud.config.server.git.basedir=target/config  #git的配置文件会加载到本地的目录spring.cloud.config.uri=http://localhost:8888

4、创建子工程configclient客户端，配置文件将从configserver获取

pom.xml

<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><parent><groupId>com.jiongyi.springboot</groupId><artifactId>jiongyi-springboot</artifactId><version>0.0.1-SNAPSHOT</version></parent><artifactId>spring-boot-configclient</artifactId><dependencies><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-config-client</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-actuator</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-server</artifactId><scope>test</scope></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency></dependencies></project>

application.properties

server.port=8080spring.cloud.config.uri=http://localhost:8888spring.application.name=configclient #代表当前服务的名称，会与configclient-{profile}.properties相对应spring.config.name=configserverspring.cloud.config.profile=dev  //将会激活dev，从而访问http://localhost:8080/configclient/active，响应：hello i am dev

ConstantProperties.java 用来读取配置文件的值，激活的profile不同，值不同

package com.jiongyi.springboot.configclient;import org.springframework.boot.context.properties.ConfigurationProperties;import org.springframework.context.annotation.Configuration;@Configuration@ConfigurationProperties(prefix="com.jiongyi.constant")public class ConstantProperties {public String active;public String getActive() {return active;}public void setActive(String active) {this.active = active;}}

HelloController.java

package com.jiongyi.springboot.configclient;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.RestController;@RestController@RequestMapping("configclient")public class HelloController {@AutowiredConstantProperties constantProperties;@RequestMapping(value="active",method={RequestMethod.GET})public String hello(){return "hello i am "+constantProperties.getActive();//返回当前激活的环境}}

ConfigClient.java 客户端启动类

package com.jiongyi.springboot.configclient;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplicationpublic class ConfigClient {  public static void main(String[] args) {    SpringApplication.run(ConfigClient.class, args);  }}

测试：浏览器访问http://localhost:8080/configclient/active，若是激活dev，输出hello i am dev ,激活test，输出hello i am test