解决nacos升级spring cloud 2020.0无法使用bootstrap.yml的问题

spring:
  application:
    # 应用名称
    name: xxx
  profiles:
    active: dev
  cloud:
    nacos:
      config:
        file-extension: yml
        server-addr: localhost:8848
        username: nacos
        password: nacos

/*
 * Copyright 2013-2020 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.cloud.util;
import org.springframework.core.env.Environment;
import org.springframework.util.ClassUtils;
public abstract class PropertyUtils {

 /**
  * Property name for checking if bootstrap is enabled.
  */
 public static final String BOOTSTRAP_ENABLED_PROPERTY = "spring.cloud.bootstrap.enabled";

 /**
  * Property name for spring boot legacy processing.
  */
 public static final String USE_LEGACY_PROCESSING_PROPERTY = "spring.config.use-legacy-processing";

 /**
  * Property name for bootstrap marker class name.
  */
 public static final String MARKER_CLASS = "org.springframework.cloud.bootstrap.marker.Marker";

 /**
  * Boolean if bootstrap marker class exists.
  */
 public static final boolean MARKER_CLASS_EXISTS = ClassUtils.isPresent(MARKER_CLASS, null);

 private PropertyUtils() {
  throw new UnsupportedOperationException("unable to instatiate utils class");
 }

 /**
  * 判断是否启用bootstrap.yml的时候默认设置成了false
  */
 public static boolean bootstrapEnabled(Environment environment) {
  return environment.getProperty(BOOTSTRAP_ENABLED_PROPERTY, Boolean.class, false) || MARKER_CLASS_EXISTS;
 }

 public static boolean useLegacyProcessing(Environment environment) {
  return environment.getProperty(USE_LEGACY_PROCESSING_PROPERTY, Boolean.class, false);
 }
}

<!--服务注册/发现-->
<dependency>
    <groupId>com.alibaba.cloud</groupId>
    <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
</dependency>
 
<!--配置中心来做配置管理-->
<dependency>
    <groupId>com.alibaba.cloud</groupId>
    <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
</dependency>

<!-- 若bootstrap配置不生效，加入以下依赖 -->
<dependency>
     <groupId>org.springframework.cloud</groupId>
     <artifactId>spring-cloud-starter-bootstrap</artifactId>
     <version>3.0.1</version>
</dependency>

@RefreshScope // 动态刷新nacos配置