使用代理獲取Azure Blob存儲值Java

Question

我可以使用代理連接到Azure Blob存儲。 現在，我想從Azure blob存儲讀取所有圖像。

            // ConnectionString
        String storageConnectionString =
                "DefaultEndpointsProtocol=https;" +
                "AccountName=xxxxxxx;" +
                "AccountKey=xxxxxxddfcfdcddrc==";

        //Authetication
        Authenticator.setDefault(new Authenticator() {
              protected PasswordAuthentication getPasswordAuthentication() {
                return new
                   PasswordAuthentication(proxyName,passowrd.toCharArray());
            }});

        //Set Proxy Host name and Port
        Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress("xxxxxxxxx", 8080));
        OperationContext op = new OperationContext();
        op.setProxy(proxy);

        // Retrieve storage account from connection-string.
        CloudStorageAccount storageAccount = CloudStorageAccount.parse(storageConnectionString);

        // Create the blob client.
       CloudBlobClient blobClient = storageAccount.createCloudBlobClient();

       // Get a reference to a container.
       // The container name must be lower case
       CloudBlobContainer container = blobClient.getContainerReference("test");

       // Create the container if it does not exist with public access.
       System.out.println("Creating container: " + container.getName());


       // Create the container if it does not exist.
       //container.createIfNotExists(BlobContainerPublicAccessType.CONTAINER, new BlobRequestOptions(), op);

       // Delete the blob.
       //container.deleteIfExists(null, null, op);
        LinkedList<String> blobNames = new LinkedList<>();
        Iterable<ListBlobItem> blobs = container.listBlobs();
        blobNames = new LinkedList<>();

       **// the line that hit an error**
        for(ListBlobItem blob: blobs) { 
            blobNames.add(((CloudBlockBlob) blob).getName());
        }

        System.out.println(blobNames.size());

        System.out.println("********Success*********");

當我在腳本上方運行時，出現以下問題：

java.util.NoSuchElementException: An error occurred while enumerating the result, check the original exception for details.java.util.NoSuchElementException: An error occurred while enumerating the result, check the original exception for details.
at com.microsoft.azure.storage.core.LazySegmentedIterator.hasNext(LazySegmentedIterator.java:113)
at com.microsoft.azure.storage.StorageException: An unknown failure occurred : Connection refused: connect
at com.microsoft.azure.storage.StorageException.translateException(StorageException.java:66)
at com.microsoft.azure.storage.core.ExecutionEngine.executeWithRetry(ExecutionEngine.java:209)
at com.microsoft.azure.storage.core.LazySegmentedIterator.hasNext(LazySegmentedIterator.java:109)
... 1 moreCaused by: java.net.ConnectException: Connection refused: connect

我不知道為什么會發生此錯誤，但它引發了以上異常並且拒絕了連接。

Answer 1

您需要通過以下重載將OperationContext傳遞給container.listBlobs（）調用：

public Iterable<ListBlobItem> listBlobs(final String prefix, final boolean useFlatBlobListing, final EnumSet<BlobListingDetails> listingDetails, BlobRequestOptions options, OperationContext opContext)

在您的情況下，這意味着

Iterable<ListBlobItem> blobs = container.listBlobs(null, false, EnumSet.noneOf(BlobListingDetails.class), null, op);

Answer 2

在for each循環中，應再次使用blobs而不是container.listBlobs() 。

然后，您可以檢查所接收的Iterable中是否包含元素。

無論如何，用完整的堆棧和源代碼的行號來回答將更容易。