Java CloudBlockBlob.download方法代码示例

import com.microsoft.azure.storage.blob.CloudBlockBlob; //导入方法依赖的package包/类
@Test
public void testRetryOn304() throws StorageException, IOException, URISyntaxException {
    OperationContext operationContext = new OperationContext();
    operationContext.getRetryingEventHandler().addListener(new StorageEvent<RetryingEvent>() {
        @Override
        public void eventOccurred(RetryingEvent eventArg) {
            fail("Request should not be retried.");
        }
    });

    CloudBlobContainer container = BlobTestHelper.getRandomContainerReference();
    try {
        container.create();
        CloudBlockBlob blockBlobRef = (CloudBlockBlob) BlobTestHelper.uploadNewBlob(container, BlobType.BLOCK_BLOB,
                "originalBlob", 1024, null);
        AccessCondition accessCondition = AccessCondition.generateIfNoneMatchCondition(blockBlobRef.getProperties().getEtag());
        blockBlobRef.download(new ByteArrayOutputStream(), accessCondition, null, operationContext);
        
        fail("Download should fail with a 304.");
    } catch (StorageException ex) {
        assertEquals("The condition specified using HTTP conditional header(s) is not met.", ex.getMessage());
    } finally {
        container.deleteIfExists();
    }
}
 

import com.microsoft.azure.storage.blob.CloudBlockBlob; //导入方法依赖的package包/类
/**
 * Retrieves a file from Azure, stores it in the local file system and
 * returns its absolute path.
 * 
 * @throws StorageException
 * @throws URISyntaxException
 */
@Override
public String retrieve(String str) throws IOException,
		GeneralSecurityException, StorageException, URISyntaxException {
	String localFileName = Constants.AZURE_DIRECTORY + "/" + str + System.currentTimeMillis();
	File localCopy = new File(localFileName);
	if (!localCopy.exists()) {
		localCopy.getParentFile().mkdirs();
		localCopy.createNewFile();
	}
	// System.out.println(localCopy.getAbsolutePath());
	CloudBlockBlob blobSource = container.getBlockBlobReference(str);
	if (blobSource.exists()) {
		blobSource.download(new FileOutputStream(localCopy));
	}
	LogUtils.debug(LOG_TAG, "File " + str + " was downloaded to "
			+ Constants.AZURE_DIRECTORY + " .");
	return localFileName;
}
 

import com.microsoft.azure.storage.blob.CloudBlockBlob; //导入方法依赖的package包/类
private byte[] downloadImage(CloudBlockBlob imgBlob){
  	LOG.debug("downloadImage");
  	ByteArrayOutputStream bos = new ByteArrayOutputStream();
  	try {
	imgBlob.download(bos);
} catch (StorageException e) {
	// TODO Auto-generated catch block
	e.printStackTrace();
}
  	return bos.toByteArray();
  }
 

import com.microsoft.azure.storage.blob.CloudBlockBlob; //导入方法依赖的package包/类
private byte[] downloadImage(CloudBlockBlob imgBlob){
	ByteArrayOutputStream bos = new ByteArrayOutputStream();
	try {
		imgBlob.download(bos);
	} catch (StorageException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}
	return bos.toByteArray();
}
 

import com.microsoft.azure.storage.blob.CloudBlockBlob; //导入方法依赖的package包/类
public byte[] getFromAzureBlobStorage(String name) throws Exception {
	CloudStorageAccount storageAccount = CloudStorageAccount.parse(azureConnectionString);
	CloudBlobClient blobClient = storageAccount.createCloudBlobClient();
	CloudBlobContainer container = blobClient.getContainerReference(containerName);
	CloudBlockBlob blob = container.getBlockBlobReference(name);

	ByteArrayOutputStream outStream = new ByteArrayOutputStream();
	blob.download(outStream);
	byte[] image = outStream.toByteArray();
	return image;
}
 

import com.microsoft.azure.storage.blob.CloudBlockBlob; //导入方法依赖的package包/类
public byte[] getFromStorageAccount(String name) throws Exception {
	CloudStorageAccount storageAccount = CloudStorageAccount.parse(connectionString);
	CloudBlobClient blobClient = storageAccount.createCloudBlobClient();
	CloudBlobContainer container = blobClient.getContainerReference("images");
	CloudBlockBlob blob = container.getBlockBlobReference(name);

	ByteArrayOutputStream outStream = new ByteArrayOutputStream();
	blob.download(outStream);
	byte[] image = outStream.toByteArray();
	return image;
}
 

import com.microsoft.azure.storage.blob.CloudBlockBlob; //导入方法依赖的package包/类
public static void main(String[] args) throws InvalidKeyException,
        URISyntaxException, StorageException, NoSuchAlgorithmException,
        IOException {
    Utility.printSampleStartInfo("BlobBasicsEncryption");

    // Retrieve storage account information from connection string
    // How to create a storage connection string -
    // https://azure.microsoft.com/en-us/documentation/articles/storage-configure-connection-string/
    CloudStorageAccount account = CloudStorageAccount
            .parse(Utility.storageConnectionString);
    CloudBlobClient blobClient = account.createCloudBlobClient();

    // Get a reference to a container
    // The container name must be lower case
    // Append a random UUID to the end of the container name so that
    // this sample can be run more than once in quick succession.
    CloudBlobContainer container = blobClient
            .getContainerReference("blobencryptioncontainer"
                    + UUID.randomUUID().toString().replace("-", ""));

    try {
        // Create the container if it does not exist
        container.createIfNotExists();

        int size = 5 * 1024 * 1024;
        byte[] buffer = new byte[size];

        Random rand = new Random();
        rand.nextBytes(buffer);

        CloudBlockBlob blob = container.getBlockBlobReference("blockBlob");

        // Create the IKey used for encryption.
        final KeyPairGenerator keyGen = KeyPairGenerator.getInstance("RSA");
        keyGen.initialize(1024);
        final KeyPair wrapKey = keyGen.generateKeyPair();
        RsaKey key = new RsaKey("rsaKey1", wrapKey);

        // Create the encryption policy to be used for upload.
        BlobEncryptionPolicy uploadPolicy = new BlobEncryptionPolicy(key,
                null);

        // Set the encryption policy on the request options.
        BlobRequestOptions uploadOptions = new BlobRequestOptions();
        uploadOptions.setEncryptionPolicy(uploadPolicy);

        System.out.println("Uploading the encrypted blob.");

        // Upload the encrypted contents to the blob.
        ByteArrayInputStream inputStream = new ByteArrayInputStream(buffer);
        blob.upload(inputStream, size, null, uploadOptions, null);

        // Download the encrypted blob.
        // For downloads, a resolver can be set up that will help pick the
        // key based on the key id.
        // Create the encryption policy to be used for download.
        LocalResolver resolver = new LocalResolver();
        resolver.add(key);
        BlobEncryptionPolicy downloadPolicy = new BlobEncryptionPolicy(
                null, resolver);

        // Set the decryption policy on the request options.
        BlobRequestOptions downloadOptions = new BlobRequestOptions();
        downloadOptions.setEncryptionPolicy(downloadPolicy);

        System.out.println("Downloading the encrypted blob.");

        // Download and decrypt the encrypted contents from the blob.
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        blob.download(outputStream, null, downloadOptions, null);
    } finally {
        // Delete the container
        container.deleteIfExists();
        Utility.printSampleCompleteInfo("BlobBasicsEncryption");
    }
}
 

import com.microsoft.azure.storage.blob.CloudBlockBlob; //导入方法依赖的package包/类
public void getImage(String name, OutputStream imageStream, long imageLength) throws Exception {
    CloudBlobContainer container = getContainer();

    CloudBlockBlob blob = container.getBlockBlobReference(name);

    if (blob.exists()) {
        blob.downloadAttributes();

        imageLength = blob.getProperties().getLength();

        blob.download(imageStream);
    }
}
 

import com.microsoft.azure.storage.blob.CloudBlockBlob; //导入方法依赖的package包/类
public static void GetImage(String name, OutputStream imageStream, long imageLength) throws Exception {
    CloudBlobContainer container = getContainer();

    CloudBlockBlob blob = container.getBlockBlobReference(name);

    if(blob.exists()){
        blob.downloadAttributes();

        imageLength = blob.getProperties().getLength();

        blob.download(imageStream);
    }
}