Java获取七牛云存储空间中图片外链

<!-- https://mvnrepository.com/artifact/com.qiniu/qiniu-java-sdk -->
<dependency>
    <groupId>com.qiniu</groupId>
    <artifactId>qiniu-java-sdk</artifactId>
    <version>7.11.0</version>
</dependency>

#七牛云参数
qiniu:
  accessKey: IrgJ4tvtYwWMr # AK
  accessSecretKey: J-0wUai568ul7L # SK
  bucket: yunpicos # 空间
  prefix: word/ # 文件名路径前缀，用于过滤，默认为空
  domain: http://img.roman.top/ # 域名

@Getter
@Configuration
public class QiNiuConfig {

    //七牛云 ak
    @Value("${qiniu.accessKey}")
    private String accessKey;

    //七牛云sk
    @Value("${qiniu.accessSecretKey}")
    private String secretKey;

    //指定七牛云空间
    @Value("${qiniu.bucket}")
    private String bucket;

    //文件名路径前缀
    @Value("${qiniu.prefix:}")
    private String prefix;

    //指定目录分隔符，列出所有公共前缀（模拟列出目录效果）。缺省值为空字符串
    @Value("${qiniu.delimiter:}")
    private String delimiter;

    //七牛云空间的域名
    @Value("${qiniu.domain:}")
    private String domain;

}

public List<String> imgUrls(){
  //参数
  String accessKey = qiNiuConfig.getAccessKey();
  String secretKey = qiNiuConfig.getSecretKey();
  String bucket = qiNiuConfig.getBucket();
  String prefix = qiNiuConfig.getPrefix();
  String delimiter = qiNiuConfig.getDelimiter();
  String domain = qiNiuConfig.getDomain();

  //构造一个带指定 Region 对象的配置类
  Configuration cfg = new Configuration(Region.region0());

  Auth auth = Auth.create(accessKey, secretKey);

  BucketManager bucketManager = new BucketManager(auth, cfg);

  //每次迭代的长度限制，最大1000，推荐值 1000
  int limit = 1000;

  //列举空间文件列表
  BucketManager.FileListIterator fileListIterator = bucketManager.createFileListIterator(bucket, prefix, limit, delimiter);
  while (fileListIterator.hasNext()) {
    //处理获取的file list结果
    FileInfo[] items = fileListIterator.next();
    //stream流过滤掉掉多余的元素，并将其余元素的所有文件路径和域名进行拼接，返回所有图片外链的集合
    List<String> collect = Arrays.stream(items).filter(f -> !f.key.equals(prefix)).map(f -> domain+f.key).collect(Collectors.toList());
    return collect;
  }
  return null;
}