Storing images in database

Question

want to store images in database for security. I c an't remember the steps to take advantae of the security feature in the DAD section of the em tool

Answer 1

I suggest that you convert the Images to jpg (or png or another format that is understood by a browser). Depending on the creation/read ration (normaly you create an image that is read several times), I suggest doing the convertion before storing it in the database
// BufferedImage bi is created before...
// out is your OutputStream to the Blob-field
com.sun.image.codec.jpeg.JPEGImageEncoder encoder = com.sun.image.codec.jpeg.JPEGCodec.createJPEGEncoder(out) ;
// get the EncodingParameters
com.sun.image.codec.jpeg.JPEGEncodeParam jep = encoder.getDefaultJPEGEncodeParam(bi) ;
jep.setQuality(compress,true) ;
encoder.setJPEGEncodeParam(jep) ;
encoder.encode(bi) ;
// System.out.println("Fertig codiert") ;
// flush the OutputStream and close it
out.flush() ;
out.close() ;you should have an unique identifier for each image, that is kept in the key column(s) of your image table.
To retrieve the image write a servlet, to which you pass this unique key as a parameter (or several if it is a multi column key) . This servlet should than access the database, select the row, open the Blob field and read it and write the bytes to an OutputStream you get from the response argument of doGet or doPost.
If you expect large images, you can stream the result, i.e. not read it in fully before writing it to the output stream but rather write each chunk you read to the output stream immediately.