Download |best| Csv File From S3 Bucket Java May 2026

If you need to save the CSV file to your local file system, the S3Client provides a straightforward method that handles the file stream for you.

import software.amazon.awssdk.core.ResponseInputStream; import software.amazon.awssdk.services.s3.model.GetObjectResponse; import java.io.BufferedReader; import java.io.InputStreamReader; // ... (s3 client and request setup as above) ResponseInputStream s3Stream = s3.getObject(getObjectRequest); try (BufferedReader reader = new BufferedReader(new InputStreamReader(s3Stream))) { String line; while ((line = reader.readLine()) != null) { // Process each CSV row String[] columns = line.split(","); System.out.println("Column 1: " + columns[0]); } } catch (Exception e) { e.printStackTrace(); } Use code with caution. Performance Considerations download csv file from s3 bucket java

import software.amazon.awssdk.regions.Region; import software.amazon.awssdk.services.s3.S3Client; import software.amazon.awssdk.services.s3.model.GetObjectRequest; import java.nio.file.Paths; public class S3DownloadFile { public static void main(String[] args) { String bucketName = "my-data-bucket"; String key = "reports/data.csv"; String downloadPath = "./downloaded_data.csv"; S3Client s3 = S3Client.builder() .region(Region.US_EAST_1) .build(); GetObjectRequest getObjectRequest = GetObjectRequest.builder() .bucket(bucketName) .key(key) .build(); // Downloads the object directly to the specified file path s3.getObject(getObjectRequest, Paths.get(downloadPath)); System.out.println("File downloaded successfully to: " + downloadPath); } } Use code with caution. Method 2: Download and Process in Memory If you need to save the CSV file

: Know the region (e.g., us-east-1 ) where your bucket is located. Method 1: Download to Local Disk Performance Considerations import software

: Your AWS credentials must have s3:GetObject permissions for the target bucket and file.