Java 服务：亚马逊S3；状态代码：404；错误代码：NoSuchBucket；从IBM云对象存储获取文件时遇到问题

我正在尝试从IBM云对象存储中的存储桶中获取文件。为此，首先我尝试读取一个bucket中所有可用的文件

private static List<String> listBuckets(AmazonS3 cosClient) {
    final List<Bucket> bucketList = cosClient.listBuckets();
    List<String> bucketNames = new ArrayList<String>();
    for (final Bucket bucket : bucketList) {
        bucketNames.add(bucket.getName());
    }
    return bucketNames;
}

public InputStream getCOSFile(AmazonS3 cosClient, String bucketName, String objectName){
    List<String> bucketNames = listBuckets(cosClient);
    if (bucketNames.contains(bucketName)){
        LOGGER.info(bucketName+" exists");
        getBucketContentsV2(cosClient, bucketName, 2);
       }

我还尝试用文档中的V1代码检索bucket中的所有文件，并得到相同的NoSuchBucket错误

下面是该方法的实现：

public static void listBuckets(AmazonS3 cosClient, String bucketName) {
    System.out.printf("Retrieving bucket contents from: %s\n", bucketName);
    ObjectListing objectListing = cosClient.listObjects(new ListObjectsRequest().withBucketName(bucketName));
    for (S3ObjectSummary objectSummary : objectListing.getObjectSummaries()) {
        System.out.printf("Item: %s (%s bytes)\n", objectSummary.getKey(), objectSummary.getSize());
    }
    System.out.println();
}

所以我尝试用代码来复制错误。我能够列出桶中的对象。我的第一个客户可能是配置错误

字符串bucketName=”“；//例如我唯一的桶名
字符串newBucketName=“”；//例如，我的另一个独特的桶名
字符串apiKey=“”；//例如“W00YiRnLW4k3fTjMB-oiB-2YSFTRFBIQWANC——P3byk”
字符串serviceInstanceId=”
public static void listBuckets(AmazonS3 cosClient, String bucketName) {
    System.out.printf("Retrieving bucket contents from: %s\n", bucketName);
    ObjectListing objectListing = cosClient.listObjects(new ListObjectsRequest().withBucketName(bucketName));
    for (S3ObjectSummary objectSummary : objectListing.getObjectSummaries()) {
        System.out.printf("Item: %s (%s bytes)\n", objectSummary.getKey(), objectSummary.getSize());
    }
    System.out.println();
}