Enterprise Application: Uploading files to Amazon S3 in C#, Java, and Golang

Estimated read time 3 min read

Uploading files to Amazon S3 requires the AWS SDK for the respective programming language. Below are examples of file upload to Amazon S3 using the AWS SDK in C#, Java, and Golang. Please make sure you have the appropriate AWS SDK installed for your language.

C# File Upload to AWS S3:

using Amazon.S3;
using Amazon.S3.Transfer;
using System;
using System.IO;
using System.Threading.Tasks;

class Program
    static async Task Main()
        string accessKey = "Your_AWS_Access_Key";
        string secretKey = "Your_AWS_Secret_Key";
        string bucketName = "Your_S3_Bucket_Name";
        string filePath = "Path_to_Your_File";

        var transferUtility = new TransferUtility(accessKey, secretKey, Amazon.RegionEndpoint.USWest2);

        using (var fileStream = new FileStream(filePath, FileMode.Open))
            await transferUtility.UploadAsync(fileStream, bucketName, Path.GetFileName(filePath));

        Console.WriteLine("File uploaded to AWS S3 in C#.");

Java File Upload to AWS S3:

import com.amazonaws.auth.AWSStaticCredentialsProvider;
import com.amazonaws.auth.BasicAWSCredentials;
import com.amazonaws.client.builder.AwsClientBuilder;
import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.AmazonS3ClientBuilder;
import com.amazonaws.services.s3.model.PutObjectRequest;

import java.io.File;

public class S3FileUploadExample {
    public static void main(String[] args) {
        String accessKey = "Your_AWS_Access_Key";
        String secretKey = "Your_AWS_Secret_Key";
        String bucketName = "Your_S3_Bucket_Name";
        String filePath = "Path_to_Your_File";

        BasicAWSCredentials credentials = new BasicAWSCredentials(accessKey, secretKey);

        AmazonS3 s3Client = AmazonS3ClientBuilder.standard()
                .withCredentials(new AWSStaticCredentialsProvider(credentials))
                .withEndpointConfiguration(new AwsClientBuilder.EndpointConfiguration("s3.amazonaws.com", "us-west-2"))

        s3Client.putObject(new PutObjectRequest(bucketName, new File(filePath).getName(), new File(filePath)));

        System.out.println("File uploaded to AWS S3 in Java.");

Golang (Go) File Upload to AWS S3:

package main

import (

func main() {
    accessKey := "Your_AWS_Access_Key"
    secretKey := "Your_AWS_Secret_Key"
    bucketName := "Your_S3_Bucket_Name"
    filePath := "Path_to_Your_File"

    sess, err := session.NewSession(&aws.Config{
        Region:      aws.String("us-west-2"),
        Credentials: credentials.NewStaticCredentials(accessKey, secretKey, ""),

    if err != nil {
        fmt.Println("Error creating session:", err)

    file, err := os.Open(filePath)
    if err != nil {
        fmt.Println("Error opening file:", err)
    defer file.Close()

    s3Client := s3.New(sess)

    _, err = s3Client.PutObject(&s3.PutObjectInput{
        Bucket: aws.String(bucketName),
        Key:    aws.String(file.Name()),
        Body:   file,
    if err != nil {
        fmt.Println("Error uploading file to AWS S3:", err)

    fmt.Println("File uploaded to AWS S3 in Golang.")

Remember to replace placeholders like “Your_AWS_Access_Key”, “Your_AWS_Secret_Key”, “Your_S3_Bucket_Name”, and “Path_to_Your_File” with your actual AWS credentials, S3 bucket name, and the local file path you want to upload. Additionally, ensure you have the necessary permissions configured in your AWS account.

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