Nacos 配置共享

多环境配置共享指在多种环境下（如：开发环境、测试环境、生产环境）下共用一个配置，这样可以减少配置量，如：应用名称、端口等等信息。

在项目开发中，微服务启动时会从 nacos 读取多个配置文件，分别如下：

（1）[spring.application.name]-[spring.profiles.active].yaml，例如：userservice-dev.yaml

（2）[spring.application.name].yaml，例如：userservice.yaml

注意：无论应用的 profile 如何变化，[spring.application.name].yaml 配置文件一定会被加载，因此多环境共享配置可以写入这个配置文件。

多环境配置共享示例

配置设计

这里创建三个配置文件，一个公共配置，一个开发环境配置和一个生产环境配置，如下：

（1）nacos_spring_cloud_demo.yaml 公共配置

demo:
    title: nacos_spring_cloud_demo

（2）nacos_spring_cloud_demo-prod.yaml 生产环境配置

demo:
    multiEnValue: nacos_spring_cloud_demo-prod

（3）nacos_spring_cloud_demo-dev.yaml 开发环境配置

demo:
    multiEnValue: nacos_spring_cloud_demo-dev

如下图：

Nacos 配置共享

bootstrap.yaml 配置

server:
  port: 8080
spring:
  application:
    # 应用名称，用来匹配 Nacos 中的配置集
    # 默认将根据下面指定的 spring.cloud.config.namespace + spring.cloud.config.group + spring.application.name + file-extension
    # 进行匹配，例如：当前应用将匹配
    # 8719efd1-94a6-49f7-9846-2debd66f6c0f 命名空间中 DEFAULT_GROUP 分组下
    # 名为 nacos_spring_cloud 且格式为 yaml 的配置集
    name: nacos_spring_cloud_demo
  cloud:
    nacos:
      config:
        # Nacos 服务地址
        server-addr: 127.0.0.1:8848
        # Nacos 配置文件扩展名
        file-extension: yaml
        # Nacos 命名空间ID
        namespace: 8719efd1-94a6-49f7-9846-2debd66f6c0f
        # Nacos 分组
        group: DEFAULT_GROUP
        # Nacos 登录账号
        username: nacos
        # Nacos 登录密码
        password: nacos

pom.xml 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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.hxstrive.nacos</groupId>
        <artifactId>springcloud_alibaba_nacos</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <artifactId>nacos_spring_cloud_demo</artifactId>
    <name>nacos_spring_cloud_demo</name>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>2.1.2.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-dependencies -->
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Greenwich.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-dependencies -->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>2.1.3.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <dependencies>
        <!-- Spring Boot Begin -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

        <!-- @ConfigurationProperties 需要 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!-- Spring Boot End -->

        <!-- Spring Cloud Begin -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
        </dependency>
        <!-- Spring Cloud End -->
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

Java 代码

package com.hxstrive.nacos;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.HashMap;
import java.util.Map;
/**
 * 多环境配置共享
 * @author hxstrive.com
 */
@RestController
@RefreshScope
public class Demo3 {
    @Value("${demo.title}")
    private String title;
    @Value("${demo.multiEnValue}")
    private String multiEnValue;
    @GetMapping("/demo3")
    public Map<String,Object> demo3() {
        return new HashMap<String,Object>(){
            {
                put("title", title);
                put("multiEnValue", multiEnValue);
            }
        };
    }
    public void setTitle(String title) {
        this.title = title;
    }
}