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、配置
2.1 Spring Cloud Config Server项目
1 pom.xml中导入Config Server需要的包
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-config-server</artifactId>
</dependency>
2 在Application类中添加@EnableConfigServer注解
package com.sunbufu;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.config.server.EnableConfigServer;
@EnableConfigServer
@SpringBootApplication
public class ConfigServerApplication {
public static void main(String[] args) {
SpringApplication.run(ConfigServerApplication.class, args);
}
}
3 修改配置文件application.yml，指定本地客户端配置文件的路径
spring:
profiles:
active: native
cloud:
config:
server:
native:
searchLocations: F:/conf
4 准备客户端配置文件
client-dev.yml文件的内容：
server: #设置成0，表示任意未被占用的端口 port: 8081 nickName: world
2.2 Spring Cloud Config Client项目
1 pom.xml中导入Config Client需要的包（注意，此处跟Config Server的配置不同）
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-config</artifactId>
</dependency>
2 在src/main/resources中，新建bootstrap.yml文件
bootstrap文件会在application文件之前加载，一般是不会变的。
spring:
application:
name: client
cloud:
config:
uri: http://127.0.0.1:8888
profile: dev
label: master
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
3 新建HelloController用来显示读取到的配置
package com.sunbufu.controller;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class HelloController {
@Value("${nickName}")
private String nickName;
@RequestMapping("/hello")
public String hello() {
return "hello " + nickName;
}
}
三、总结
源码地址 ：https://github.com/sunbufu/sunbufu-cloud
总觉的使用svn或者git不如直接修改配置文件方便，特此记录下来。
spring cloud config本地读取配置文件
1、创建maven项目，引入spring boot 起步依赖
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.7.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.wxz</groupId>
<artifactId>cloud-config-demo3</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>cloud-config-demo3</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${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>
新建config-server 模块，引入依赖
<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>com.wxz</groupId>
<artifactId>cloud-config-demo3</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.wxz</groupId>
<artifactId>config-server</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>config-server</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-config-server</artifactId>
<version>2.1.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
2、配置文件：
spring:
cloud:
config:
server:
native:
search-locations: classpath:/shared
profiles:
active: native
application:
name: config-server
server:
port: 8769
在resources下新建目录shared，里面新建文件config-client-dev
server: port: 8762 foo: foo version 1
在启动类添加
@EnableConfigServer
新建config-client模块
<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>com.wxz</groupId>
<artifactId>cloud-config-demo3</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.wxz</groupId>
<artifactId>config-client</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>config-client</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.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>
<version>2.1.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
新建配置文件bootstrap.yml(bootstrap比application具有优先的读取顺序)
spring:
cloud:
config:
uri: http://localhost:8769
fail-fast: true
application:
name: config-client
profiles:
active: dev
新建一个controller进行测试：
package com.wxz.configclient.controller;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
/**
* @author Wangxingze
* @date 2019-08-26 12:58
*/
@RestController
public class Test {
@Value("${foo}")
public String foo;
@GetMapping("/t")
public String t(){
return foo;
}
}
依次启动server client,启动时可以看到读取了配置文件和启动黛安克，访问：
注意：spring boot 和cloud的版本以及config依赖的版本
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.7.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
我这里好像没有指定spring cloud 的版本呀
config的相关依赖使用：<version>2.1.2.RELEASE</version>
以上为个人经验，希望能给大家一个参考，也希望大家多多支持。
