在Java中读取Azure Blob存储区中文件的文件属性

Question

下面是我使用

com.microsoft.azure.storage

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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，在这里，给定上传到Azure Blob商店的文件的文件路径，它可以返回该文件的属性，特别是上传的日期和时间

Java中是否有支持这一点的API

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.

您正在寻找的方法是^{}，它返回类型为^{}的对象将设置类型为^{}的blob属性。它将包含关于blob的信息。你想在那里使用的方法是getLastModified()

但是，这将返回上次更新blob的日期/时间。因此，如果您创建了一个blob，并且没有对其进行任何更改，那么可以使用此属性来确定它是何时上载的。但是，如果在创建blob后对其进行任何更改（如设置属性/元数据等），则返回的值是上次更改的日期/时间

如果您对查找blob是何时创建的感兴趣，您可能希望将此信息与blob一起存储为自定义元数据

你可以在这里获得关于SDK的详细信息：http://azure.github.io/azure-storage-java/