1. 实现EnvironmentPostProcessor

import cn.hutool.http.HttpUtil;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.env.EnvironmentPostProcessor;
import org.springframework.boot.env.YamlPropertySourceLoader;
import org.springframework.core.env.ConfigurableEnvironment;
import org.springframework.core.env.PropertySource;
import org.springframework.core.io.ByteArrayResource;
import org.springframework.core.io.Resource;

import java.io.IOException;


public class CustomEnvironmentPostProcessor implements EnvironmentPostProcessor {


    @Override
    public void postProcessEnvironment(ConfigurableEnvironment environment, SpringApplication application) {
        // 方法将被调用两次，加载配置文件之前，加载配置文件之后（加载文件之前就不调用）
        if (environment.getActiveProfiles().length == 0) {
            return;
        }
        // 获取配置
        String yamlContent = HttpUtil.get("");

        // 将YAML内容转换为字节数组，以便加载
        byte[] yamlBytes = yamlContent.getBytes();
        // 创建一个ByteArrayResource对象，用于加载YAML内容
        Resource resource = new ByteArrayResource(yamlBytes);
        YamlPropertySourceLoader loader = new YamlPropertySourceLoader();
        PropertySource<?> propertySource = null;
        try {
            propertySource = loader.load("remoteConfig", resource).get(0);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
        environment.getPropertySources().addFirst(propertySource);
    }
}

2. 添加配置
   
   resources->META-INF->spring.factories

org.springframework.boot.env.EnvironmentPostProcessor=\
com.你的包.CustomEnvironmentPostProcessor

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