How to download all files uploaded in directory of S3 bucket in single operation | Amazon S3 | java

Namaste everyone,

Today, we are learning, how to download all files available in a folder or directory of the S3 bucket in a single operation. This will also help you to answer how to download multiples files from a directory or S3 bucket.
For this, we are using a transfer manager client which is also another way of performing the S3 operations along with an S3 client.

This video will also give you a brief idea that how to download all files from the S3 bucket in a single operation.

#awsS3 #amazonS3 #s3Bucket #download #operation #smartyTechFizz #beSmartBeTechie

[SmartyTechFizz]

​ In S3 there is nothing like a folder or directory every file is unique with an index which is key. on UI AWS simulates it by grouping similar parts of the path of keys like folders, hence unless you list all files you will never know which is the last file inserted or modified( Never Do That ).

So, in order to do what you trying to achieve, you can do the below ways:-
1) Either you can list all the files from the directory, sort them in descending order and get the latest files from it. ( I'll not prefer this bcoz your directory maybe containing a large number of objects and that may affect performance ).

2) For every insert operation or all operation, you may store metadata or you can say object key in the table, that may help you to get files from S3. ( this is better than the above solution ).

3) (This is the same as 2nd one ) If you have used AWS lambda, add a Lambda which will subscribe to S3 events put or delete or add whatever operation you need, then on that lambda when you receive the S3 event, maintain a table where do the crud operation for files inserted in s3 in any database and then from DB you can do whatever you want.

*In Short, there is no such direct way of doing filtered operation, we need to replicate document metadata in some database table to access files from S3 based on metadata. Keep the object key in the table to access the file in S3.*

Hoping, this will help all of you.
Keep watching!!! Keep learning!!!

[devmishra]

Hi mam, need your help. I want to download single folder with all files inside folder, but downloading all the directory

[senthamizhanloganathan]

I am using a Spring boot application to read and write files on AWS S3. Currently, we are getting the presigned URL using S3 API to download and upload individual files. Now my requirement is to implement the ability to download the directory as a zip(zipping can be done at front end). Could you please suggest how can I create an API which will be used by front-end developers to download all the files of a particular directory and zip it?

[sushanthatkar]

How download s3 bucket from power shell

[pentyalaprashanth]

How to download from s3 signed url which is generated from our service java code

[pentyalaprashanth]

huge file from s3 location any recommended way or suggestions

[sags]

can yu please share the code for me please, its really urgent for me