Menu
Build blob storage applications using the Azure Storage Blob SDK for Java.
The review-first prompt is selected by default. You can switch to a direct command or download a local copy.
Read SKILL.md and any companion files shown by SkillsMP before deciding whether to install.
Install with Codex or Claude Copy this prompt, paste it into Codex, Claude, or another assistant, and let it review the skill page and install it for you.
A direct command skips the review prompt. Inspect the source before running it.
npx skills add https://github.com/BEKO2210/Firstbrain --skill azure-storage-blob-javaThe command stays on one line. Scroll horizontally to inspect it before copying.
Prefer a local copy? Download the files currently available to SkillsMP.
Showing SKILL.md
Based on SOC occupation classification
| name | azure-storage-blob-java |
| description | Build blob storage applications using the Azure Storage Blob SDK for Java. |
| type | skill |
| created | 2026-02-27T00:00:00.000Z |
| domain | cloud-infrastructure |
| category | azure |
| risk | unknown |
| source | community |
| tags | ["skill","cloud-infrastructure","azure","storage","blob"] |
Build blob storage applications using the Azure Storage Blob SDK for Java.
<dependency>
<groupId>com.azure</groupId>
<artifactId>azure-storage-blob</artifactId>
<version>12.33.0</version>
</dependency>
import com.azure.storage.blob.BlobServiceClient;
import com.azure.storage.blob.BlobServiceClientBuilder;
// With SAS token
BlobServiceClient serviceClient = new BlobServiceClientBuilder()
.endpoint("<storage-account-url>")
.sasToken("<sas-token>")
.buildClient();
// With connection string
BlobServiceClient serviceClient = new BlobServiceClientBuilder()
.connectionString("<connection-string>")
.buildClient();
import com.azure.identity.DefaultAzureCredentialBuilder;
BlobServiceClient serviceClient = new BlobServiceClientBuilder()
.endpoint("<storage-account-url>")
.credential(new DefaultAzureCredentialBuilder().build())
.buildClient();
import com.azure.storage.blob.BlobContainerClient;
// From service client
BlobContainerClient containerClient = serviceClient.getBlobContainerClient("mycontainer");
// Direct construction
BlobContainerClient containerClient = new BlobContainerClientBuilder()
.connectionString("<connection-string>")
.containerName("mycontainer")
.buildClient();
import com.azure.storage.blob.BlobClient;
// From container client
BlobClient blobClient = containerClient.getBlobClient("myblob.txt");
// With directory structure
BlobClient blobClient = containerClient.getBlobClient("folder/subfolder/myblob.txt");
// Direct construction
BlobClient blobClient = new BlobClientBuilder()
.connectionString("<connection-string>")
.containerName("mycontainer")
.blobName("myblob.txt")
.buildClient();
// Create container
serviceClient.createBlobContainer("mycontainer");
// Create if not exists
BlobContainerClient container = serviceClient.createBlobContainerIfNotExists("mycontainer");
// From container client
containerClient.create();
containerClient.createIfNotExists();
import com.azure.core.util.BinaryData;
// Upload string
String data = "Hello, Azure Blob Storage!";
blobClient.upload(BinaryData.fromString(data));
// Upload with overwrite
blobClient.upload(BinaryData.fromString(data), true);
blobClient.uploadFromFile("local-file.txt");
// With overwrite
blobClient.uploadFromFile("local-file.txt", true);
import com.azure.storage.blob.specialized.BlockBlobClient;
BlockBlobClient blockBlobClient = blobClient.getBlockBlobClient();
try (ByteArrayInputStream dataStream = new ByteArrayInputStream(data.getBytes())) {
blockBlobClient.upload(dataStream, data.length());
}
import com.azure.storage.blob.models.BlobHttpHeaders;
import com.azure.storage.blob.options.BlobParallelUploadOptions;
BlobHttpHeaders headers = new BlobHttpHeaders()
.setContentType("text/plain")
.setCacheControl("max-age=3600");
Map<String, String> metadata = Map.of("author", "john", "version", "1.0");
try (InputStream stream = new FileInputStream("large-file.bin")) {
BlobParallelUploadOptions options = new BlobParallelUploadOptions(stream)
.setHeaders(headers)
.setMetadata(metadata);
blobClient.uploadWithResponse(options, null, Context.NONE);
}
import com.azure.storage.blob.models.BlobRequestConditions;
BlobParallelUploadOptions options = new BlobParallelUploadOptions(inputStream, length)
.setRequestConditions(new BlobRequestConditions().setIfNoneMatch("*"));
blobClient.uploadWithResponse(options, null, Context.NONE);
// Download to BinaryData
BinaryData content = blobClient.downloadContent();
String text = content.toString();
// Download to file
blobClient.downloadToFile("downloaded-file.txt");
try (ByteArrayOutputStream outputStream = new ByteArrayOutputStream()) {
blobClient.downloadStream(outputStream);
byte[] data = outputStream.toByteArray();
}
import com.azure.storage.blob.specialized.BlobInputStream;
try (BlobInputStream blobIS = blobClient.openInputStream()) {
byte[] buffer = new byte[1024];
int bytesRead;
while ((bytesRead = blobIS.read(buffer)) != -1) {
// Process buffer
}
}
import com.azure.storage.blob.specialized.BlobOutputStream;
try (BlobOutputStream blobOS = blobClient.getBlockBlobClient().getBlobOutputStream()) {
blobOS.write("Data to upload".getBytes());
}
import com.azure.storage.blob.models.BlobItem;
// List all blobs
for (BlobItem blobItem : containerClient.listBlobs()) {
System.out.println("Blob: " + blobItem.getName());
}
// List with prefix (virtual directory)
import com.azure.storage.blob.models.ListBlobsOptions;
ListBlobsOptions options = new ListBlobsOptions().setPrefix("folder/");
for (BlobItem blobItem : containerClient.listBlobs(options, null)) {
System.out.println("Blob: " + blobItem.getName());
}
import com.azure.storage.blob.models.BlobListDetails;
String delimiter = "/";
ListBlobsOptions options = new ListBlobsOptions()
.setPrefix("data/")
.setDetails(new BlobListDetails().setRetrieveMetadata(true));
for (BlobItem item : containerClient.listBlobsByHierarchy(delimiter, options, null)) {
if (item.isPrefix()) {
System.out.println("Directory: " + item.getName());
} else {
System.out.println("Blob: " + item.getName());
}
}
blobClient.delete();
// Delete if exists
blobClient.deleteIfExists();
// Delete with snapshots
import com.azure.storage.blob.models.DeleteSnapshotsOptionType;
blobClient.deleteWithResponse(DeleteSnapshotsOptionType.INCLUDE, null, null, Context.NONE);
import com.azure.storage.blob.models.BlobCopyInfo;
import com.azure.core.util.polling.SyncPoller;
// Async copy (for large blobs or cross-account)
SyncPoller<BlobCopyInfo, Void> poller = blobClient.beginCopy("<source-blob-url>", Duration.ofSeconds(1));
poller.waitForCompletion();
// Sync copy from URL (for same account)
blobClient.copyFromUrl("<source-blob-url>");
import com.azure.storage.blob.sas.*;
import java.time.OffsetDateTime;
// Blob-level SAS
BlobSasPermission permissions = new BlobSasPermission().setReadPermission(true);
OffsetDateTime expiry = OffsetDateTime.now().plusDays(1);
BlobServiceSasSignatureValues sasValues = new BlobServiceSasSignatureValues(expiry, permissions);
String sasToken = blobClient.generateSas(sasValues);
// Container-level SAS
BlobContainerSasPermission containerPermissions = new BlobContainerSasPermission()
.setReadPermission(true)
.setListPermission(true);
BlobServiceSasSignatureValues containerSasValues = new BlobServiceSasSignatureValues(expiry, containerPermissions);
String containerSas = containerClient.generateSas(containerSasValues);
import com.azure.storage.blob.models.BlobProperties;
// Get properties
BlobProperties properties = blobClient.getProperties();
System.out.println("Size: " + properties.getBlobSize());
System.out.println("Content-Type: " + properties.getContentType());
System.out.println("Last Modified: " + properties.getLastModified());
// Set metadata
Map<String, String> metadata = Map.of("key1", "value1", "key2", "value2");
blobClient.setMetadata(metadata);
// Set HTTP headers
BlobHttpHeaders headers = new BlobHttpHeaders()
.setContentType("application/json")
.setCacheControl("max-age=86400");
blobClient.setHttpHeaders(headers);
import com.azure.storage.blob.specialized.BlobLeaseClient;
import com.azure.storage.blob.specialized.BlobLeaseClientBuilder;
BlobLeaseClient leaseClient = new BlobLeaseClientBuilder()
.blobClient(blobClient)
.buildClient();
// Acquire lease (-1 for infinite)
String leaseId = leaseClient.acquireLease(60);
// Renew lease
leaseClient.renewLease();
// Release lease
leaseClient.releaseLease();
import com.azure.storage.blob.models.BlobStorageException;
try {
blobClient.download(outputStream);
} catch (BlobStorageException e) {
System.out.println("Status: " + e.getStatusCode());
System.out.println("Error code: " + e.getErrorCode());
// 404 = Blob not found
// 409 = Conflict (lease, etc.)
}
import com.azure.core.http.ProxyOptions;
import com.azure.core.http.netty.NettyAsyncHttpClientBuilder;
import java.net.InetSocketAddress;
ProxyOptions proxyOptions = new ProxyOptions(
ProxyOptions.Type.HTTP,
new InetSocketAddress("localhost", 8888));
BlobServiceClient client = new BlobServiceClientBuilder()
.endpoint("<endpoint>")
.sasToken("<sas-token>")
.httpClient(new NettyAsyncHttpClientBuilder().proxy(proxyOptions).build())
.buildClient();
AZURE_STORAGE_CONNECTION_STRING=DefaultEndpointsProtocol=https;AccountName=...
AZURE_STORAGE_ACCOUNT_URL=https://<account>.blob.core.windows.net
This skill is applicable to execute the workflow or actions described in the overview.