Show Image stored in byte array form in java servlet

Question

I have image stored as a byte[]. Now I want to display it from a Java servlet. I am using this code:

response.setContentType("image/gif");
OutputStream out = response.getOutputStream();
out.write(img); // image is of byte[] type.
out.flush();
out.close();

But I am getting the error "The image cannot be displayed because it contains an error."

How have you validated that your byte array is valid? Have you tried fetching the URL using curl, and checking the results against the original data? — Jon Skeet
– Jon Skeet, Commented Mar 17, 2015 at 12:22
It is correct. Actually I am storing the image to Hbase from reading it from disk in byte array form. And then reading the data from hbase again in byte array form and displaying it to browser through servlet. — Harsh Sharma
– Harsh Sharma, Commented Mar 17, 2015 at 12:31
are you shure that you array actually contains the data for a gif image? Or could it be a JPEG, or PNG? Where do you get the data from? — Alexander
– Alexander, Commented Mar 17, 2015 at 12:38
Actually it is a jpg image. I have tried response.setContentType("image/jpeg"); also, but getting the same error. — Harsh Sharma
– Harsh Sharma, Commented Mar 17, 2015 at 12:41
So have you tried fetching the URL with curl (or wget) as I suggested? — Jon Skeet
– Jon Skeet, Commented Mar 17, 2015 at 12:50

Harsh Sharma · Accepted Answer · 2015-03-18 10:09:10Z

Actually the reason was totally different for this error.I am performing my task in two steps =>

First to convert image into byte[] and storing into hbase. And then getting the byte[] from hbase and showing it through browser.

In the question I mentioned the code of 2nd part, but the actual problem that was causing the error was in 1st part. The reason of the error was:

Initially I was converting the image into byte[] using the code

    File imgPath = new File(ImageName);
    BufferedImage bufferedImage = ImageIO.read(imgPath);

    // get DataBufferBytes from Raster
    WritableRaster raster = bufferedImage.getRaster();
    DataBufferByte data = (DataBufferByte) raster.getDataBuffer();

    return (data.getData());

Which was causing the error

"Exception in thread "main" java.lang.IllegalArgumentException: image == null!
    at javax.imageio.ImageTypeSpecifier.createFromRenderedImage(ImageTypeSpecifier.java:925)
    at javax.imageio.ImageIO.getWriter(ImageIO.java:1591)
    at javax.imageio.ImageIO.write(ImageIO.java:1520)
    at com.medianet.hello.HbaseUtil.main(HbaseUtil.java:138)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)
"

When I changed the code to

    ByteArrayOutputStream baos=new ByteArrayOutputStream();
    BufferedImage img=ImageIO.read(new File(ImageName));
    ImageIO.write(img, "jpg", baos);
    baos.flush();

    return baos.toByteArray();

It worked.

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