Java

REST Stream Response to File (Streaming Download) (Amazon S3)

See more Amazon S3 (new) Examples

Demonstrates how to stream the response body directly to a file. (The example shows how to stream a JPG from the Amazon S3 service.) Chilkat2 Java

import com.chilkatsoft.chilkat2.AuthAws;
import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.Rest;
import com.chilkatsoft.chilkat2.Stream;

public class ChilkatExample {

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

        Rest rest = new Rest();

        // Connect to the Amazon AWS REST server.
        boolean bTls = true;
        int port = 443;
        boolean bAutoReconnect = true;
        rest.connect("s3.amazonaws.com", port, bTls, bAutoReconnect);

        // ----------------------------------------------------------------------------
        // Important: For buckets created in regions outside us-east-1,
        // there are three important changes that need to be made.
        // See Working with S3 Buckets in Non-us-east-1 Regions for the details.
        // ----------------------------------------------------------------------------

        // Provide AWS credentials for the REST call.
        AuthAws authAws = new AuthAws();
        authAws.setAccessKey("AWS_ACCESS_KEY");
        authAws.setSecretKey("AWS_SECRET_KEY");
        authAws.setServiceName("s3");
        rest.setAuthAws(authAws);

        // Set the bucket name via the HOST header.
        // In this case, the bucket name is "chilkat100".
        rest.setHost("chilkat100.s3.amazonaws.com");

        // Send the request to download the JPG.
        try {
            rest.sendReqNoBody("GET", "/starfish.jpg");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Read the response header.
        int responseStatusCode = rest.readResponseHeader();
        if (responseStatusCode < 0) {
            System.out.println(rest.getLastErrorText());
            return;
        }

        System.out.println("Response status code = " + responseStatusCode);

        // We expect a 200 response status if the JPG data is coming.
        // Otherwise, we'll get a string response body with an error message(or no response body).
        if (responseStatusCode == 200) {
            Stream bodyStream = new Stream();

            // The stream's sink will be a file.
            bodyStream.setSinkFile("qa_output/starfish.jpg");

            // Read the response body to the stream.  Given that we've
            // set the stream's sink to a file, it will stream directly
            // to the file.
            try {
                rest.readRespBodyStream(bodyStream, true);
            } catch (ChilkatException e) {
                System.out.println(e.getLastErrorText());
                return;
            }

            System.out.println("Successfully received the JPG file.");
        } else {
            String errResponse = null;
            try {
                errResponse = rest.readRespBodyString();
                System.out.println(errResponse);
            } catch (ChilkatException e) {
                System.out.println(e.getLastErrorText());
            }
        }
    }
}