Byte Array to Image object

Question

I am given a byte[] array in Java which contains the bytes for an image, and I need to output it into an image. How would I go about doing this?

Much thanks

Answer 1

BufferedImage img = ImageIO.read(new ByteArrayInputStream(bytes));

Answer 2

If you know the type of image and only want to generate a file, there's no need to get a BufferedImage instance. Just write the bytes to a file with the correct extension.

try (OutputStream out = new BufferedOutputStream(new FileOutputStream(path))) {
    out.write(bytes);
}

Answer 3

From Database.
Blob blob = resultSet.getBlob("pictureBlob");               
byte [] data = blob.getBytes( 1, ( int ) blob.length() );
BufferedImage img = null;
try {
img = ImageIO.read(new ByteArrayInputStream(data));
} catch (IOException e) {
    e.printStackTrace();
}
drawPicture(img);  //  void drawPicture(Image img);

Answer 4

Since it sounds like you already know what format the byte[] array is in (eg RGB, ARGB, BGR etc.) you might be able to use BufferedImage.setRGB(...) , or a combination of BufferedImage.getRaster() and WritableRaster.setPixels(...) or WritableRaster.setSamples(...) . Unforunately both of these methods require you transform your byte[] into one of int[], float[] or double[] depending on the image format.

Answer 5

根据 Java 文档，看起来您需要使用MemoryImageSource 类将字节数组放入内存中的对象中，然后接下来使用 Component.createImage(ImageProducer) （传入实现 ImageProducer 的 MemoryImageSource）。