Java Requires Chilkat v11.0.0+

Generate an AWS (S3) Pre-Signed URL to Download File

See more Amazon S3 (new) Examples

Demonstrates how to generate a pre-signed URL to download a file from the Amazon S3 service. Chilkat2 Java

import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.Http;

public class ChilkatExample {

    public static void main(String[] args) {
        // This example assumes the Chilkat API to have been previously unlocked.
        // See Global Unlock Sample for sample code.

        Http http = new Http();

        http.setAwsAccessKey("AWS_ACCESS_KEY");
        http.setAwsSecretKey("AWS_SECRET_KEY");

        // Make sure to set your AWS region correctly
        http.setAwsRegion("us-east-1");

        String bucketName = "chilkat100";
        String objectName = "starfish/starfish.jpg";
        String localFilePath = "qa_output/starfish.jpg";
        String awsService = "s3";

        // The signed URL will be valid for this number of seconds:
        int numSecondsValid = 86400;

        // Choose between a URL beginning with "http://" or "https://"...
        boolean bUseHttps = false;

        // Generate the pre-signed URL
        String preSignedUrl;
        try {
            preSignedUrl = http.s3GenPresignedUrl("GET", bUseHttps, bucketName, objectName, numSecondsValid, awsService);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // The following URL can be copy-and-pasted into a browser..
        System.out.println("Pre-Signed AWS S3 URL: " + preSignedUrl);

        // Here's an example of a pre-signed URL.
        // This URL will only work within 1 day (86400 seconds) after the time this example was published.
        //
        //     http://chilkat100.s3.amazonaws.com/starfish/starfish.jpg?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=16QXXDGY83AJJR6RVQ02%2F20170111%2Fus-west-2%2Fs3%2Faws4_request&X-Amz-Date=20170111T161959Z&X-Amz-Expires=86400&X-Amz-SignedHeaders=host&X-Amz-Signature=72bf4fd9a15d7bbcdd313a3318d937a778905f62a3fbff9b789d8dc28acd9232

        // Now try to do an HTTP Download using the signed URL.
        try {
            http.download(preSignedUrl, "c:/temp/qa_output/starfish.jpg");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        System.out.println("Success.");
    }
}