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Upload an Object Using Pre-Signed URL - AWS SDK for Java

The following tasks guide you through using the Java classes to upload an object using a pre-signed URL.

Uploading Objects

Create an instance of the AmazonS3 class by providing your AWS credentials. These credentials are used in creating a signature for authentication when you generate a pre-signed URL.

Generate a pre-signed URL by executing the AmazonS3.generatePresignedUrl method.

You provide a bucket name, an object key, and an expiration date by creating an instance of the GeneratePresignedUrlRequest class. You must specify the HTTP verb PUT when creating this URL if you want to use it to upload an object.

Anyone with the pre-signed URL can upload an object.

The upload creates an object or replaces any existing object with the same key that is specified in the pre-signed URL.

The following Java code sample demonstrates the preceding tasks.

AWSCredentials myCredentials = new BasicAWSCredentials(
                                myAccessKeyID, mySecretKey);
AmazonS3 s3Client = new AmazonS3Client(myCredentials); 

java.util.Date expiration = new java.util.Date();
long msec = expiration.getTime();
msec += 1000 * 60 * 60; // Add 1 hour.
expiration.setTime(msec);

GeneratePresignedUrlRequest generatePresignedUrlRequest = new GeneratePresignedUrlRequest(bucketName, objectKey);
generatePresignedUrlRequest.setMethod(HttpMethod.PUT); 
generatePresignedUrlRequest.setExpiration(expiration);
             
URL s = s3client.generatePresignedUrl(generatePresignedUrlRequest); 

// Use the pre-signed URL to upload an object.

Example

The following Java code example generates a pre-signed URL The example code then uses the pre-signed URL to upload sample data as an object. For instructions about how to create and test a working sample, see Testing the .NET Code Examples

import java.io.IOException;
import java.net.URL;

import com.amazonaws.AmazonClientException;
import com.amazonaws.AmazonServiceException;
import com.amazonaws.HttpMethod;
import com.amazonaws.auth.PropertiesCredentials;
import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.AmazonS3Client;
import com.amazonaws.services.s3.model.GeneratePresignedUrlRequest;
import java.net.*;
import java.io.*;

public class S3Sample {
	private static String bucketName = "ExampleBucket"; 
	private static String objectKey = "JavaObj.xml";

	public static void main(String[] args) throws IOException {
		AmazonS3 s3client = new AmazonS3Client(new PropertiesCredentials(
			S3Sample.class.getResourceAsStream("AwsCredentials.properties")));

		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); 

			UploadObject(url);

			System.out.println("Pre-Signed URL = " + url.toString());
		} 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());
		} 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());
		}
	}

	public static void UploadObject(URL url) throws IOException
	{
		HttpURLConnection connection=(HttpURLConnection) url.openConnection();
		connection.setDoOutput(true);
		connection.setRequestMethod("PUT");
		OutputStreamWriter out = new OutputStreamWriter(
				connection.getOutputStream());
		out.write("This text uploaded as object.");
		out.close();
		int responseCode = connection.getResponseCode();

	}
}

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