Skills azure-storage-blob-java
📦

azure-storage-blob-java

Safe

Manage Azure Blob Storage with Java SDK

Store and retrieve unstructured data efficiently using Azure Blob Storage. This skill provides complete Java SDK patterns for uploading, downloading, and managing blobs with proper authentication and error handling.

Supports: Claude Codex Code(CC)
🥉 72 Bronze
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Test it

Using "azure-storage-blob-java". Upload a JSON configuration file to a container named 'configs' with blob name 'app-settings.json'

Expected outcome:

  • Created BlobContainerClient for 'configs'
  • Uploaded app-settings.json (2.4 KB) with content-type: application/json
  • Blob URL: https://<account>.blob.core.windows.net/configs/app-settings.json

Using "azure-storage-blob-java". List all blobs in 'data/2024/' prefix and download each to local ./downloads folder

Expected outcome:

  • Found 15 blobs with prefix 'data/2024/'
  • Downloaded data/2024/report-q1.csv (1.2 MB)
  • Downloaded data/2024/report-q2.csv (1.5 MB)
  • Downloaded data/2024/summary.json (45 KB)
  • Total: 15 files downloaded to ./downloads

Security Audit

Safe
v1 • 2/25/2026

This skill is pure documentation for Azure Storage Blob SDK for Java. Static analyzer detected 49 'external_commands' patterns and 1 'network' pattern, but all are FALSE POSITIVES. The backticks are markdown code block delimiters (```java, ```xml, ```bash), not shell command execution. The URL is a documentation example for environment variable configuration. No executable code, no command injection vectors, no malicious patterns detected.

1
Files scanned
394
Lines analyzed
0
findings
1
Total audits
No security issues found
Audited by: claude

Quality Score

38
Architecture
100
Maintainability
87
Content
32
Community
100
Security
100
Spec Compliance

What You Can Build

Cloud Application Developer

Build scalable applications that store user uploads, logs, or media files in Azure Blob Storage with proper authentication using DefaultAzureCredential or connection strings.

Data Engineer

Implement data lake patterns with hierarchical blob listing, metadata management, and streaming operations for large datasets.

DevOps Engineer

Automate backup and archival workflows with SAS token generation, blob copy operations, and lifecycle management.

Try These Prompts

Basic Blob Upload 
Show me how to upload a text file to Azure Blob Storage using Java SDK with a connection string.
Container Management 
Create a blob container if it does not exist, then list all blobs with a specific prefix and download them to a local folder.
SAS Token Generation 
Generate a SAS token for a blob that allows read-only access for 24 hours, then show how to use it to download the blob without credentials.
Streaming Large Files 
Upload a large file using parallel upload with custom content type and metadata, handle retries on failure, and set appropriate HTTP headers for caching.

Best Practices

  • Use DefaultAzureCredential for production deployments to avoid hardcoded credentials
  • Set appropriate content-type and cache-control headers when uploading blobs
  • Use SAS tokens with minimal permissions and short expiry times for shared access
  • Implement retry policies and handle BlobStorageException for transient failures
  • Use parallel upload options for files larger than 100 MB

Avoid

  • Never commit connection strings or SAS tokens to source control
  • Avoid using account keys in application code - prefer managed identities or SAS tokens
  • Do not set SAS token expiry times longer than necessary for the use case
  • Avoid downloading entire containers without pagination for large datasets

Frequently Asked Questions

What authentication methods does Azure Blob Storage SDK support?
The SDK supports connection strings, Shared Access Signatures (SAS), Azure Active Directory credentials via DefaultAzureCredential, and account keys. For production, use DefaultAzureCredential with managed identities or service principals.
How do I handle large file uploads efficiently?
Use BlobParallelUploadOptions for files larger than 100 MB. The SDK automatically chunks the file and uploads in parallel. Configure chunk size and concurrency based on your network capacity.
What is the difference between BlobClient, BlobContainerClient, and BlobServiceClient?
BlobServiceClient manages the storage account level operations. BlobContainerClient manages a specific container within the account. BlobClient operates on a specific blob within a container.
How do I securely share blob access with external users?
Generate SAS tokens with specific permissions (read, write, etc.) and expiry times. Use container-level SAS for multiple blobs or blob-level SAS for single file access. Never share account keys.
Can I organize blobs in folders within a container?
Azure Blob Storage uses a flat namespace but supports hierarchical naming with forward slashes in blob names. Use the prefix parameter in listBlobs operations to simulate folder navigation.
How do I handle blob storage errors and retries?
Catch BlobStorageException to handle specific error codes (404 for not found, 409 for conflicts). The SDK includes built-in retry policies. Configure retry options in client builder for production resilience.

Developer Details

Author

sickn33

License

MIT

Repository

https://github.com/sickn33/antigravity-awesome-skills/tree/main/skills/azure-storage-blob-java

Ref

main

File structure

📄 SKILL.md