To download all files from an Amazon S3 bucket using Java, the most efficient and modern approach is to use the provided by the AWS SDK for Java 2.x . This tool simplifies complex operations like recursive directory downloads by handling multi-threaded transfers and object listing automatically. Prerequisites
The Transfer Manager's downloadDirectory method is the simplest way to synchronize an entire bucket or folder to a local path. Step-by-Step Code Example: download all files from s3 bucket java
If you need granular control—such as filtering files based on custom logic or metadata—you can manually list objects and download them one by one. aws/aws-sdk-java-v2 - s3-transfer-manager - GitHub To download all files from an Amazon S3