Image Scaling using servlet

Question

Hi guys ,
I am facing problems where i have to download a image from a database and scale it to a thumbnail.
i am using below code to get the image from db and to write it to stream.
  conn = Utilities.getDBConnection();
           stream = response.getOutputStream();
           ps = conn.prepareStatement("query");
           rs = ps.executeQuery();
           while(rs.next())
               Blob attach = null;
               byte[] blobBytesArray = null;
               attach = rs.getBlob(1);
               int len = new Integer( new Long( attach.length()).toString() ).intValue();
               blobBytesArray = attach.getBytes(1,len);
               if (blobBytesArray != null)
                 if (blobBytesArray.length > 0 )
                      stream.write(blobBytesArray) ;
                      stream.flush();
                      stream.close();
              }How to scale this image?

Answer 1

Apparently you want to display this image in a webpage, so I'd say that CSS is the way to scale the displayed image.
If you want to do it in the servlet you'd have to turn the image into a BufferedImage (using the ImageIO class) and use the Graphics class to create a scaled instance of it, then output the binary image data of the scaled instance back to the servlet's outputstream using the ImageIO class again.