当一个系统中的配置文件发生改变的时候，我们需要重新启动该服务，才能使得新的配置文件生效，spring cloud config可以实现微服务中的所有系统的配置文件的统一管理，而且还可以实现当配置文件发生变化的时候，系统会自动更新获取新的配置。在spring cloud config 组件中，分两个角色，一是config server，二是config client。
1.搭建git仓库, https://github.com/JasonSparrow/config.git
2.创建config-client-dev.properties文件, config-client-dev这个文件名称格式是固定的, 服务名称-环境, config-client是服务名称, dev是环境, 客户端会根据这个字段来区分读取哪个配置文件.
3.在config-client-dev.properties文件设置值userName=Jason
4.上传config-client-dev.properties到仓库
分布式配置中心流程图
当client 向 config server 发起请求获取配置信息的时候, config server不会每次都去Git仓库中获取, 而是缓存在内存里, 只有当git仓库配置文件发生变化, 或者客户端需要强制刷新配置中心文件时, config server才会去Git中获取配置信息.
config-server项目搭建
pom文件依赖
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.2.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</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>
<repositories>
<repository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>https://repo.spring.io/milestone</url>
<snapshots>
<enabled>false</enabled>
</snapshots>
</repository>
</repositories>
application.properties 配置文件, 或者application.yml
spring.application.name=config-server
server.port=8889
spring.cloud.config.server.git.uri=https://github.com/JasonSparrow/config.git
spring.cloud.config.server.git.searchPaths=respo
spring.cloud.config.label=master
spring.cloud.config.server.git.username=
spring.cloud.config.server.git.password=
spring.cloud.config.server.git.uri：配置git仓库地址
spring.cloud.config.server.git.searchPaths：配置仓库路径
spring.cloud.config.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config-server项目
@SpringBootApplication
@EnableConfigServer
public class ConfigServerApp {
public static void main(String[] args) {
SpringApplication.run(ConfigServerApp, args);
}
}
@EnableConfigServer 开启SpringCloudConfig服务端
config-client项目搭建
pom依赖
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.2.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</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>
</dependencies>
<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>
bootstrap.properties配置文件
#上传到git的文件名config-client-dev.properties
#config-client 名称要一样
spring.application.name=config-client
#分支
spring.cloud.config.label=master
#文件名
spring.cloud.config.profile=dev
#要读取的服务器的地址
spring.cloud.config.uri= http://localhost:8889/
server.port=8881
获取配置中的值
@RestController
public class TestController {
@Value("${userName}")
private String userName;
@RequestMapping("/getUserName")
public String getUserName() {
return userName;
}
}
@Value("${userName}")将会去读取配置中心config-client-dev.properties文件中userName的值
启动config-client
@SpringBootApplication
public class ConfigClientApp {
public static void main(String[] args) {
SpringApplication.run(ConfigClientApp.class, args);
}
}
注意:先启动config-server, 再启动config-client, 因为config-client启动时需要spring.cloud.config.uri= http://localhost:8889/访问config-server信息.
以上config-server和config-client都是在本地启动的, 但是在微服务架构中, 应该把他们都注册到eureka上, 因为在SpringCloud中, 服务之间是通过项目名称来调用的, 只需要在配置文件中添加如下配置即可.
###服务注册到eureka地址
eureka:
client:
service-url:
defaultZone: http://localhost:8100/eureka
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