¿Cómo descargar un objeto S3 en Java?

How to download an S3 object in Java?

To download an object, we’ll first use the getObject () method on s3client which will return an S3Object object. Once we get this, we’ll call getObjectContent () on this to get an S3ObjectInputStream object which behaves like a conventional Java InputStream.

1. Introduction In this tutorial, we’ll learn how to interact with the Amazon S3 (Simple Storage Service) storage system programmatically, from Java. Remember that S3 has a very simple structure – each bucket can store any number of objects which can be accessed using either a SOAP interface or an REST-style API.

An AmazonS3.getObject method gets an object from the S3 bucket. A bucket name and Object Key are only information required for getting the object. This method returns an object, which contains Object metadata and Object content as an HTTP stream.

There are several ways to upload files to a private AWS S3 bucket directly from browser, and can be challenging and confusing, but with a little effort, you will have a huge improvement in your performance. In my case the performance upgrade was about 200% thanks to the AWS S3 Transfer Acceleration endpoint.

To download a file, we can use getObject ().The data from S3 comes in a binary format. In the example below, the data from S3 gets converted into a String object with toString () and write to a file with writeFileSync method.

The pre-signed URL is generated with an expiration data, after which it can not used anymore by anyone else in case the URL somehow gets compromised. In this blog post we’re going to upload a file into a private S3 bucket using such a pre-signed URL.

Remember that S3 has a very simple structure – each bucket can store any number of objects which can be accessed using either a SOAP interface or an REST-style API. Going forward, we’ll use the AWS SDK for Java to create, list, and delete S3 buckets.