Spring@Value使用获取配置信息为null的操作

@Component
public class AliyunOssConstants implements InitializingBean{ 
 /**
  * 阿里云OSS地域节点
  */
 @Value("${aliyunOss.file.endpoint}")
    private String endpoint;
 
 /**
  * 阿里云OSSaccessKeyId
  */
    @Value("${aliyunOss.file.keyid}")
    private String accessKeyId;
 
    /**
     * 阿里云OSSaccessKeySecret
     */
    @Value("${aliyunOss.file.keysecret}")
    private String accessKeySecret;
 
    /**
     * 阿里云OSSbucket名称
     */
    @Value("${aliyunOss.file.bg.bucketname}")
    private String bg_bucketname;
 
    /**
     * 阿里云OSSBucket域名
     */
    @Value("${aliyunOss.file.filehost}")
    private String filehost;    
    public  static  String SPRING_FILE_ENDPOINT;
    public  static  String SPRING_FILE_ACCESS_KEY_ID;
    public  static  String SPRING_FILE_ACCESS_KEY_SECRET;
    public  static  String SPRING_FILE_BG_BUCKET_NAME;
    public  static  String SPRING_FILE_FILE_HOST;
 
 @Override
 public void afterPropertiesSet() throws Exception {
  SPRING_FILE_ENDPOINT = endpoint;
  SPRING_FILE_ACCESS_KEY_ID = accessKeyId;
  SPRING_FILE_ACCESS_KEY_SECRET = accessKeySecret;
  SPRING_FILE_BG_BUCKET_NAME = bg_bucketname;
  SPRING_FILE_FILE_HOST = filehost;
 } 
}

@Slf4j
public class AliyunOSSUtil { 
 private static String endpoint=AliyunOssConstants.SPRING_FILE_ENDPOINT;
 private static String accessKeyId=AliyunOssConstants.SPRING_FILE_ACCESS_KEY_ID;
 private static String accessKeySecret=AliyunOssConstants.SPRING_FILE_ACCESS_KEY_SECRET;
 private static String bucketname=AliyunOssConstants.SPRING_FILE_BG_BUCKET_NAME;
 private static String filehost=AliyunOssConstants.SPRING_FILE_FILE_HOST; 
    // 阿里云OSS上传文件方法
}

@Value("${tag}")
private String tagValue;

@Component //遗漏
class TestValue{
    @Value("${tag}")
    private String tagValue;
}

@Component 
class TestValue{
    @Value("${tag}")
    private String tagValue;
} 
class Test{
    ...
    TestValue testValue = new TestValue()