SpringBoot不读取bootstrap.yml/properties文件问题

<dependency>
   <groupId>com.fasterxml.jackson.dataformat</groupId>
   <artifactId>jackson-dataformat-yaml</artifactId>
   <version>2.11.2</version>
</dependency>

import org.springframework.util.ResourceUtils;
import org.yaml.snakeyaml.Yaml; 
import java.io.File;
import java.io.FileReader;
import java.io.Reader;
import java.util.Map; 
public class YmlUtil {  
   public static Map<String,Object> getYaml(String filePath){
      Yaml yml = new Yaml();
      Reader reader = null;
      try {
//       String filePath = ResourceUtils.getURL("classpath:").getPath() + "/application.yml";
         reader = new FileReader(new File(filePath));
      } catch (Exception e) {
         // TODO: handle exception
         e.printStackTrace();
      }
      return yml.loadAs(reader, Map.class);
   }
 
   public static Object getPropValue(Map<String,Object> map,String key){
      Map<String,Object> temp = map;
      int length = key.split("\\.").length;
      for (int i = 0; i < length; i++) {
         if(i==length-1){
            //叶子节点直接获取
            return temp.get(key.split("\\.")[i]);
         }else{
            temp = (Map<String, Object>)temp.get(key.split("\\.")[i]);
         }
      }
      return null;
   }
 
//使用方法
   public static void main(String[] args) {
      try{
         Map<String,Object> map = getYaml(ResourceUtils.getURL("classpath:").getPath() + "/application.yml");
         Object val = getPropValue(map,"spring.profiles.active");
      }catch (Exception e){ 
      }
   }
}