Convert an image from file to byte[]

gistfile1.java

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.*;

/**
 * User: najum
 * Date: 01.08.12
 * Time: 12:51
 */
public class ImageToByteArray {

    /**
     * @param args
     */
    public static void main(String[] args) throws Exception {
        File file = new File("/Users/najum/Desktop/test.png");
        loadFileFromPersistentStore(file);

        BufferedImage bufferedImage = ImageIO.read(file);
        loadImageFromMemory(bufferedImage);
    }

    /**
     * @param file
     * @throws IOException
     */
    private static void loadImageFromMemory(BufferedImage image) throws IOException {
        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
        ImageIO.write(image, "jpeg", byteArrayOutputStream);
        byte[] imageData = byteArrayOutputStream.toByteArray();
        System.out.println(imageData.length);
    }


    /**
     * @throws Exception
     * @throws FileNotFoundException
     */
    private static void loadFileFromPersistentStore(File file) throws Exception, FileNotFoundException {
        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
        copyStream(new FileInputStream(file), byteArrayOutputStream);
        byte[] data = byteArrayOutputStream.toByteArray();
        System.out.println(data.length);
    }


    private static void copyStream(InputStream src, OutputStream dest) throws Exception {
        byte[] buffer = new byte[16384];
        int len;
        while ((len = src.read(buffer)) > 0) {
            dest.write(buffer, 0, len);
        }
        src.close();
        dest.close();
    }
}