aws-sdk-java-v2-s3

This skill is a curated reference of Amazon S3 usage patterns built on the AWS SDK for Java 2.x. It addresses the recurring problem of getting S3 object storage right in Java applications: how to create and manage buckets, upload and download objects with the correct request builders, handle large files, generate temporary access URLs, and wire all of this into a Spring Boot application. Rather than leaving developers to piece together the SDK's fluent builder API from scattered docs, it provides ready-to-adapt code snippets with sensible defaults such as server-side encryption and storage-class selection.

The material covers the core object lifecycle (createBucket with waiters, putObject via RequestBody.fromFile, getObject to a path, batched deleteObjects), presigned URL generation with the S3Presigner and a bounded expiration, and the S3 Transfer Manager for optimized large-file transfers. Reference files go deeper on client setup with retry policies, object operations, transfer patterns, and multi-environment Spring Boot integration including sync/async clients, reactive service templates, metadata-aware uploads, prefix listing, and batch deletes. A quick-reference table maps each operation to its SDK method and storage classes to their use cases.

It targets Java backend developers and cloud engineers integrating S3 into services, particularly Spring Boot teams who need production-oriented configuration examples. Typical use cases include building file-storage features, migrating to SDK v2, adding presigned-URL sharing, and tuning large-file transfers. Credentials are handled through standard providers and externalized environment variables, following normal AWS practice.