Azure BlobStorage SDK Java V8 で BlobItemにテキストを追記(Append)する

BlobItem の TYPE が APPEND BLOBとして作成されていないとAppendできないところがポイントでした。

package hello.azure.blobstorage;

import java.util.Date;

import com.microsoft.azure.storage.CloudStorageAccount;
import com.microsoft.azure.storage.StorageException;
import com.microsoft.azure.storage.blob.BlobRequestOptions;
import com.microsoft.azure.storage.blob.CloudAppendBlob;
import com.microsoft.azure.storage.blob.CloudBlobClient;
import com.microsoft.azure.storage.blob.CloudBlobContainer;

public class WriteData2 {
    // copy from azure console
    public static final String storageConnectionString = "{yourString}";

    public static void main(String[] args) {
        CloudStorageAccount storageAccount;
        CloudBlobClient blobClient = null;
        CloudBlobContainer container = null;

        String containerName = "{yourContainerName}";
        String blobName = "{yourBlobName}";

        try {
            // Parse the connection string and create a blob client to interact with Blob
            // storage
            storageAccount = CloudStorageAccount.parse(storageConnectionString);
            blobClient = storageAccount.createCloudBlobClient();
            container = blobClient.getContainerReference(containerName);
            {
                CloudAppendBlob cab = container.getAppendBlobReference(blobName);
                if (cab.exists() == false) {
                    // BLOB TYPE : Append Blob として作成される
                    cab.createOrReplace();
                }
                BlobRequestOptions options = new BlobRequestOptions();
                options.setAbsorbConditionalErrorsOnRetry(true);
                // BLOB TYPE が Append Blob でないとエラーになる
                // Error returned from the service. Http code: 306 and error code:
                // IncorrectBlobType
                cab.appendText("Hello " + new Date() + "\n", "UTF-8", null, options, null);
            }
            System.err.println("finished.");
        } catch (StorageException ex) {
            ex.printStackTrace();
            System.err.println(
                    String.format("HttpStatusCode=%d,ErrorCode=%d", ex.getHttpStatusCode(), ex.getErrorCode()));
        } catch (Exception ex) {
            ex.printStackTrace();
        } finally {

        }
    }
}