在 Java 中读取 Azure Blob 存储中文件的文件属性

Question

下面是我使用

将文件上传到 Azure Blob Store 的代码

com.microsoft.azure.storage

图书馆

public class BlobUploader {
    private CloudBlobContainer blobContainer;
    private static Logger LOGGER = LoggerFactory.getLogger(BlobUploader.class);

    /**
     * Constructor of the BlobUploader
     * 
     * @param storageAccountName The storage account name where the files will be uploaded to.
     * @param storageAccountKey The storage account key of the storage account
     * @param containerName The container name where the files will be uploaded to.
     */
    public BlobUploader( String storageAccountName, String storageAccountKey, String containerName ) {

        String storageConnectionString = "DefaultEndpointsProtocol=http;AccountName=" + storageAccountName + ";AccountKey=" + storageAccountKey;

        CloudStorageAccount storageAccount;
        try {
            storageAccount = CloudStorageAccount.parse( storageConnectionString );
            CloudBlobClient blobClient = storageAccount.createCloudBlobClient();
            // Retrieve reference to a previously created container.
            this.blobContainer = blobClient.getContainerReference( containerName );
        } catch ( Exception e ) {
            LOGGER.error( "failed to construct blobUploader", e );
        }
    }

    public void upload( String filePath ) throws Exception {

        // Define the path to blob in the container
        String blobPath = "/uploads";
        File fileToBeUploaded = new File( filePath );
        String fileName = fileToBeUploaded.getName();

        String blobName = blobPath + fileName;

        // Create or overwrite the blob with contents from a local file.
        CloudBlockBlob blob = blobContainer.getBlockBlobReference( blobName );

        System.out.println( "start uploading file " + filePath + " to blob " + blobName );

        blob.upload( new FileInputStream( fileToBeUploaded ), fileToBeUploaded.length() );
        System.out.println( "upload succeeded." );
    }
}

我正在寻找一个 API，其中，给定上传到 Azure Blob Store 的文件的文件路径，它可以 return 我获取该文件的属性，特别是日期和上传时间。

Java中有支持这个的API吗？

Answer 1

I am looking for an API, where, given a file path to a file uploaded to the Azure Blob Store, it can return me the properties of that file, specifically, the date and time uploaded.

您要找的方法是downloadAttributes() which ~~returns an object of type BlobProperties~~ will set blob's properties that are of type BlobProperties。它将包含有关 blob 的信息。您想要使用的方法是 getLastModified().

然而，这将 return 上次更新 blob 时的 date/time。因此，如果您创建了一个 blob 并且未对其进行任何更改，则此属性可用于查明它的上传时间。但是，如果您在创建 blob 后对其进行任何更改（如设置 properties/metadata 等），则值 returned 是上次更改时的 date/time。

如果您有兴趣了解 blob 的创建时间，您可能希望将此信息作为自定义元数据与 blob 一起存储。

您可以在此处获取有关 SDK 的详细信息：http://azure.github.io/azure-storage-java/。

在 Java 中读取 Azure Blob 存储中文件的文件属性

Reading file properties of a file in Azure Blob Store in Java

java

azure

azure-blob-storage