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http://blog.csdn.net/forezp/article/details/70037291
本文出自方志朋的博客
在上一篇文章讲述zuul的时候，已经提到过，使用配置服务来保存各个服务的配置文件。它就是Spring Cloud Config。
一、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。在spring cloud config 组件中，分两个角色，一是config server，二是config client。
二、构建Config Server
创建一个spring-boot项目，取名为config-server-git,其pom.xml:
<?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.lying</groupId>
<artifactId>config-server-git</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>config-server-git</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.10.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>
<spring-cloud.version>Edgware.SR2</spring-cloud.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-config-server</artifactId>
</dependency>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</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>
在程序的入口Application类加上@EnableConfigServer注解开启配置服务器的功能，代码如下：
package com.lying.configservergit;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.config.server.EnableConfigServer;
@SpringBootApplication
@EnableConfigServer
public class ConfigServerGitApplication {
public static void main(String[] args) {
SpringApplication.run(ConfigServerGitApplication.class, args);
}
}
需要在程序的配置文件application.yaml文件配置以下：
server:
port: 9998
spring:
application:
name: config-server
cloud:
config:
server:
git:
uri: https://github.com/lyingfromyou/SpringCloudConfig
spring.cloud.config.server.git.uri：配置git仓库地址
如果Git仓库为公开仓库，可以不填写用户名和密码，如果是私有仓库需要填写
远程仓库https://github.com/lyingfromyou/SpringCloudConfig中有两个配置文件, 启动程序：访问http://localhost:9998/config-client/default,dev
{
"name": "config-client",
"profiles": ["default,dev"],
"label": null,
"version": "6a51af687a44d45f2c98ffb2d267f4057db6efe0",
"state": null,
"propertySources": [{
"name": "https://github.com/lyingfromyou/SpringCloudConfig/config-client-dev.yaml",
"source": {
"info.profile": "dev"
}
}, {
"name": "https://github.com/lyingfromyou/SpringCloudConfig/config-client.yaml",
"source": {
"info.profile": "default",
"info.message": "hello"
}
}]
}
证明配置服务中心可以从远程程序获取配置信息。
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
三、构建一个config client
重新创建一个springboot项目，取名为config-client,其pom文件：
<?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.lying</groupId>
<artifactId>config-client</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>config-client</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.10.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>
<spring-cloud.version>Edgware.SR2</spring-cloud.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-config</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</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>
其配置文件bootstrap.yaml(关于application.yaml和bootstrap.yaml的区别>>http://www.cnblogs.com/EasonJim/p/7589546.html)：
server:
port: 9997
spring:
application:
name: config-client
cloud:
config:
uri: http://localhost:9998/
profile: default ##默认default
label: master
上述配置参数与Git中存储的配置文件中各个部分的对应关系如下：
spring.application.name：对应配置文件规则中的{application}部分
spring.cloud.config.profile：对应配置文件规则中的{profile}部分
spring.cloud.config.label：对应配置文件规则中的{label}部分
spring.cloud.config.uri：配置中心config-server的地址
程序的入口类，写一个API接口“／print”，返回从配置中心读取的 "info.message" 变量的值，代码如下：
package com.lying.configclient.controller;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class ExampleController {
@Value("${info.message}")
private String message;
@RequestMapping(value = "/print", method = RequestMethod.GET)
public String print() {
return message;
}
}
打开网址访问：http://localhost:9997/print，网页显示：
hello
这就说明，config-client从config-server-git获取了 "info.message" 的属性，而config-server-git是从git仓库读取的,如图：
本文源码下载： https://github.com/lyingfromyou/SpringCloudExample
