Springcloud获取nacos中的配置信息demo

谁践踏了优雅 2023-10-04 22:56 64阅读 0赞

## Nacos config ##

Data ID 的命名格式是：`{spring.application.name}.{file-extension}`  
其中的spring.application.name和file-extension在服务的yaml中配置。  
![在这里插入图片描述][9dd4100f7aa54cc59b0490e4f3196e9a.png]

## 测试代码 ##

### 1. 配置nacos地址 ###

spring:
      application:
        name: demo
      cloud:
        nacos:
          config:
            server-addr: localhost:8848
            file-extension: yaml
          discovery:
            server-addr: localhost:8848
      main:
        allow-bean-definition-overriding: true
    logging:
      level:
        com.alibaba.nacos.*: WARN

### 2. 获取配置并打印 ###

ConfigurableApplicationContext applicationContext = SpringApplication.run(DemoApplication.class, args);
    @SpringBootApplication
    @ServletComponentScan
    public class DemoApplication {
        
    
        public static void main(String[] args) throws InterruptedException {
        
    
            ConfigurableApplicationContext applicationContext = SpringApplication.run(DemoApplication.class, args);
            while (true) {
        
                //当动态配置刷新时，会更新到 Enviroment中，因此这里每隔一秒中从Enviroment中获取配置
                String userName = applicationContext.getEnvironment().getProperty("dubbo.protocol.name");
                String userAge = applicationContext.getEnvironment().getProperty("dubbo.protocol.port");
                System.out.println("配置信息，名称：{}，年龄：{}"+userName+" "+userAge);
                TimeUnit.SECONDS.sleep(1);
            }
        }
    }

![在这里插入图片描述][f874b516f8d642c3bb88223a3eddca39.png]

### Demo代码 ###

参考上面的测试代码，我们已经可以获得nacos中的配置信息，现在只需要创建专门一个config类，来获取即可。  
**注意下这里的value的包不要导错**`import org.springframework.beans.factory.annotation.Value;`

# nacos中dubbo的配置信息
    dubbo:
      scan:
        base-packages: com.example.demo.service
      protocol:
        name: dubbo
        port: 7702
      registry:
        address: nacos://localhost:8848
      consumer:
        timeout: 60000
        check: false
      application:
        name: ${
        spring.application.name}
      cloud:

import org.springframework.beans.factory.annotation.Value;
    import org.springframework.stereotype.Component;
    
    @Component
    public class DubboConfig {
        
    
        @Value("${dubbo.scan.base-packages}")
        private String scanBasePackages;
    
        @Value("${dubbo.protocol.name}")
        private String protocolName;
    
        @Value("${dubbo.protocol.port}")
        private int protocolPort;
    
        @Value("${dubbo.registry.address}")
        private String registryAddress;
    
        @Value("${dubbo.consumer.timeout}")
        private int consumerTimeout;
    
        @Value("${dubbo.consumer.check}")
        private boolean consumerCheck;
    
        @Value("${spring.application.name}")
        private String applicationName;
    
        // getters and setters
    
    }

这样我们就算配置成功了。

如果别的类还需要用到这些配置信息，我们还可以

import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Component;
    
    @Component
    public class SomeService {
        
    
        @Autowired
        private DubboConfig dubboConfig;
    
        public void someMethod() {
        
            String scanBasePackages = dubboConfig.getScanBasePackages();
            String protocolName = dubboConfig.getProtocolName();
            int protocolPort = dubboConfig.getProtocolPort();
            String registryAddress = dubboConfig.getRegistryAddress();
            int consumerTimeout = dubboConfig.getConsumerTimeout();
            boolean consumerCheck = dubboConfig.isConsumerCheck();
            String applicationName = dubboConfig.getApplicationName();
            // use these configuration properties
        }
    
    }

[9dd4100f7aa54cc59b0490e4f3196e9a.png]: https://img-blog.csdnimg.cn/9dd4100f7aa54cc59b0490e4f3196e9a.png
[f874b516f8d642c3bb88223a3eddca39.png]: https://img-blog.csdnimg.cn/f874b516f8d642c3bb88223a3eddca39.png