Async HTTP Upload to S3 using presignedURL (with progress indicator) - amazon-web-services

Question

The code below provides the ability to upload a zip archive to a AWS s3 presigned URL. I resorted to using HttpURLConnection to conduct the upload, but it seems to block on getResponse. I am looking to implement a feedback loop so that I can print the progress of upload completed.
How I can go about capturing progress of upload that I can print to stdout?
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.AmazonClientException;
import com.amazonaws.AmazonServiceException;
import com.amazonaws.HttpMethod;
import com.amazonaws.auth.profile.ProfileCredentialsProvider;
import com.amazonaws.services.s3.AmazonS3ClientBuilder;
import com.amazonaws.services.s3.model.GeneratePresignedUrlRequest;
public class App {
private static String bucketName = "XXXXX";
private static String objectKey = "XXXX/file.zip";
public static void main(String[] args) throws Exception {
URL url = getPresignedUrl();
uploadToUrlHTTP(url,new File("/XXX/XXXX/file.zip"));
}
public static URL getPresignedUrl() {
AmazonS3 s3Client = AmazonS3ClientBuilder.standard()
.withCredentials(new ProfileCredentialsProvider("default")).build();
try {
System.out.println("Generating pre-signed URL.");
java.util.Date expiration = new java.util.Date();
long milliSeconds = expiration.getTime();
milliSeconds += 1000 * 60 * 60; // Add 1 hour.
expiration.setTime(milliSeconds);
GeneratePresignedUrlRequest generatePresignedUrlRequest =
new GeneratePresignedUrlRequest(bucketName, objectKey);
generatePresignedUrlRequest.setMethod(HttpMethod.PUT);
generatePresignedUrlRequest.setExpiration(expiration);
URL url = s3Client.generatePresignedUrl(generatePresignedUrlRequest);
System.out.println("Pre-Signed URL = " + url.toString());
return url;
} catch (AmazonServiceException exception) {
System.out.println("Caught an AmazonServiceException, " +
"which means your request made it " +
"to Amazon S3, but was rejected with an error response " +
"for some reason.");
System.out.println("Error Message: " + exception.getMessage());
System.out.println("HTTP Code: " + exception.getStatusCode());
System.out.println("AWS Error Code:" + exception.getErrorCode());
System.out.println("Error Type: " + exception.getErrorType());
System.out.println("Request ID: " + exception.getRequestId());
return null;
} catch (AmazonClientException ace) {
System.out.println("Caught an AmazonClientException, " +
"which means the client encountered " +
"an internal error while trying to communicate" +
" with S3, " +
"such as not being able to access the network.");
System.out.println("Error Message: " + ace.getMessage());
return null;
}
}
public static void uploadToUrlHTTP(URL url, File file) {
HttpURLConnection connection;
try {
InputStream inputStream = new FileInputStream(file);
connection = (HttpURLConnection) url.openConnection();
connection.setDoOutput(true);
connection.setRequestMethod("PUT");
OutputStream out =
connection.getOutputStream();
byte[] buf = new byte[1024];
int count;
int total = 0;
long fileSize = file.length();
while ((count =inputStream.read(buf)) != -1)
{
if (Thread.interrupted())
{
throw new InterruptedException();
}
out.write(buf, 0, count);
total += count;
int pctComplete = new Double(new Double(total) / new Double(fileSize) * 100).intValue();
System.out.print("\r");
System.out.print(String.format("PCT Complete: %d", pctComplete));
}
System.out.println();
out.close();
inputStream.close();
System.out.println("Finishing...");
int responseCode = connection.getResponseCode();
if (responseCode == 200) {
System.out.printf("Successfully uploaded.");
}
} catch (IOException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}