nacos+springboot实现多环境实时更新配置

asfx站长

2021.09.16 15:35:46 阅读 807

这里通过namespace的方法来实现多环境隔离配置。

springboot的主版本使用的是：2.3.3.RELEASE

1.添加依赖
```
<properties>
        <java.version>1.8</java.version>
        <spring-boot.version>2.3.3.RELEASE</spring-boot.version>
        <nacos-config-spring-boot.version>0.2.1</nacos-config-spring-boot.version>
    </properties>
    <dependencies>
        <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>

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

<dependency>
            <groupId>com.alibaba.boot</groupId>
            <artifactId>nacos-config-spring-boot-starter</artifactId>
            <version>${nacos-config-spring-boot.version}</version>
        </dependency>

<dependency>
            <groupId>com.alibaba.boot</groupId>
            <artifactId>nacos-config-spring-boot-actuator</artifactId>
            <version>${nacos-config-spring-boot.version}</version>
        </dependency>

<dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>

</dependencies>
```

2.在nacos中添加命名空间，并定义命名空间id（若不指定则系统默认生成uuid）
![](//www.asfx.xyz/statics/images/bg/202109/16/c2b5bef98869483eb6417196cefa7060.png)

3.在nacos对应的命名空间新建配置
![](//www.asfx.xyz/statics/images/bg/202109/16/0ca72bdc2f054ec2be587c970ef2de08.png)
![](//www.asfx.xyz/statics/images/bg/202109/16/1ccab079366a438c8ad9d52359aa5ac9.png)

4.新建几个配置文件，比如application-dev.properties和application-test.properties，里面指定不同的namespace

application-dev.properties:
```
nacos.config.server-addr=127.0.0.1:8848
nacos.config.namespace=ns_dev
```

application-test.properties:
```
nacos.config.server-addr=127.0.0.1:8848
nacos.config.namespace=ns_test
```

5.启动的时候指定环境，例如在application.properties中指定为开发环境：spring.profiles.active=dev

6.可实时更新的属性配置建议统一某个类中指定，这样方便管理和废弃。
```
import com.alibaba.nacos.api.config.annotation.NacosConfigurationProperties;
import com.alibaba.nacos.api.config.annotation.NacosValue;
import lombok.Data;
import org.springframework.context.annotation.Configuration;

@Data
@Configuration
@NacosConfigurationProperties(dataId = "example-d", autoRefreshed = true)
public class NacosProperties {

@NacosValue(value = "${say.hello:}", autoRefreshed = true)
    private String sayHi;
}
```

7.代码调用
```
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/hello")
public class HelloController {

@Autowired
    NacosProperties nacosProperties;

@GetMapping("/sayHi")
    public String sayHi() {
        return nacosProperties.getSayHi();
    }
}
```

这样，既能实现在不停服务的情况下实时更新配置，又能按照环境去隔离配置。后期还能按照命名空间去分配权限给其他人员进行隔离使用。