Converting byte array to jpg image file throughing exception

Question

Hi I have a byte array that I am converting to jpg image but that is giving exception as below please explain me wht is the problem with this.

ByteArrayInputStream bis = new ByteArrayInputStream(someByteArray);
                Iterator<?> readers = ImageIO.getImageReadersByFormatName("jpg");

            //ImageIO is a class containing static methods for locating ImageReaders
                //and ImageWriters, and performing simple encoding and decoding. 
                ImageReader reader = (ImageReader) readers.next();
                Object source = bis;
                ImageInputStream iis = ImageIO.createImageInputStream(source);
                reader.setInput(iis, true);
                ImageReadParam param = reader.getDefaultReadParam();

                BufferedImage image = reader.read(0, param);
            //got an image file

                BufferedImage bufferedImage = new BufferedImage(image.getWidth(null), image.getHeight(null), BufferedImage.TYPE_INT_RGB);
            //bufferedImage is the RenderedImage to be written

                Graphics2D g2 = bufferedImage.createGraphics();
                g2.drawImage(image, null, null);

                File imageFile = new File("D:\\newrose2.jpg");
                ImageIO.write(bufferedImage, "jpg", imageFile);

Exception:

javax.imageio.IIOException: Invalid JPEG file structure: SOS before SOF
    at com.sun.imageio.plugins.jpeg.JPEGImageReader.readImageHeader(Native Method)
    at com.sun.imageio.plugins.jpeg.JPEGImageReader.readNativeHeader(JPEGImageReader.java:550)
    at com.sun.imageio.plugins.jpeg.JPEGImageReader.readNativeHeader(JPEGImageReader.java:550)
    at com.sun.imageio.plugins.jpeg.JPEGImageReader.checkTablesOnly(JPEGImageReader.java:295)
    at com.sun.imageio.plugins.jpeg.JPEGImageReader.gotoImage(JPEGImageReader.java:427)
    at com.sun.imageio.plugins.jpeg.JPEGImageReader.readHeader(JPEGImageReader.java:543)
    at com.sun.imageio.plugins.jpeg.JPEGImageReader.readInternal(JPEGImageReader.java:986)
    at com.sun.imageio.plugins.jpeg.JPEGImageReader.read(JPEGImageReader.java:966)
    at Trnsport.writejpegfile(Trnsport.java:398)
    at Trnsport.getData(Trnsport.java:107)
    at Trnsport.run(Trnsport.java:63)
    at java.lang.Thread.run(Thread.java:722)

Edit:

FileOutputStream fos = new FileOutputStream("image" + new Date().getTime() + ".jpg");
fos.write(someByteArray);
    fos.close();

Answer 1

If your byte array already contains valid JPEG data, you do not need to invoke the JPEG reader or writer -- you can write the bytes to the file using ordinary file I/O.

If the byte array actually contains some format of raw pixel data, you will need to load it into a BufferedImage directly (such as via setRGB) and encode that as a JPEG.

The fact that you're getting an exception trying to decode it implies it is not JPEG data, but raw pixel data. Or, perhaps it is a different type of image altogether, or it has an image at some offset into the array instead of at the start the array, or it is not an image at all.