14.验证Nacos 配置加载顺序

application -> ext(n,1) -> share(n,1) 我们可以通过如下代码进行验证

创建bootstrap.yaml

代码语言：javascript复制

spring:
  application:
    name: order
  cloud:
    nacos:
      config:
        server-addr: 192.168.64.2:8848
        namespace: test
        file-extension: properties
        sharedConfigs:
          - dataId: share1.properties
            refresh: true
          - dataId: share2.properties
            refresh: true
        ext-config:
          - dataId: ext1.properties
            refresh: true
          - dataId: ext2.properties
            refresh: true
server:
  port: 8081

添加nacos配置

代码语言：javascript复制

# 配置内容和文件对应
source=order.properties
source=ext1.properties
source=ext2.properties
source=share1.properties
source=share2.properties

编写测试接口

代码语言：javascript复制

/**
 * @Author 乐哥聊编程
 * @Doc 关注公众号"乐哥聊编程"获取文档和源码
 * @Date 2023/5/21
 * @Description
 */
@RestController
@RefreshScope
public class IndexController {

    @Value("${source}")
    private String source;
    @GetMapping("/source")
    public String hello(){
        return source;
    }
}

通过修改nacos配置，验证接口返回值

核心源码

从源码可以看出首先加载share,其次ext,最后application，和我们验证顺序相同

代码语言：javascript复制

public PropertySource<?> locate(Environment env) {
  nacosConfigProperties.setEnvironment(env);
  ConfigService configService = nacosConfigManager.getConfigService();

  if (null == configService) {
   log.warn("no instance of config service found, can't load config from nacos");
   return null;
  }
  long timeout = nacosConfigProperties.getTimeout();
  nacosPropertySourceBuilder = new NacosPropertySourceBuilder(configService,
    timeout);
  String name = nacosConfigProperties.getName();

  String dataIdPrefix = nacosConfigProperties.getPrefix();
  if (StringUtils.isEmpty(dataIdPrefix)) {
   dataIdPrefix = name;
  }

  if (StringUtils.isEmpty(dataIdPrefix)) {
   dataIdPrefix = env.getProperty("spring.application.name");
  }

  CompositePropertySource composite = new CompositePropertySource(
    NACOS_PROPERTY_SOURCE_NAME);

  loadSharedConfiguration(composite);
  loadExtConfiguration(composite);
  loadApplicationConfiguration(composite, dataIdPrefix, nacosConfigProperties, env);
  return composite;
 }

nacos 编程 接口 配置 源码

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