Saving binary data as images on the client machine

[Srikanth Madasu]

Hi All, I have an application where user uploads a file and then we need to process the file and after that pull some images from from DB(binary data) and save this data as images on the client machine. I have some prob in saving the images on client machine.

I am using the following code in my action class : but this saves files on the server :

            byte[] buf = getfromDB(.......);
            File f = new File("C:\\Images\image1.TIF"); \\fixed path on client machine
            FileOutputStream fos = new FileOutputStream(f);
            DataOutputStream dos = new DataOutputStream(fos);
            dos.write(buf);            
            dos.close();
            fos.close();

I did some research and found that ServletOutputStream is actually used in downloading files from server to client. But I am not sure if I could use this class to save the binary data.

Any help would be greatly appreciated

Thanks in advance..

--Srik

[Bear Bibeault]

You cannot directly write files to a client system. Think of the nightmarish security implications if you could!

Rather, you must make the file available for download, and the user can choose to save the file or not.

[Lorand Komaromi]

Yes, you could write it to the servlet's output stream to send it to the client (after sending the appropriate Content-type header), but if you're using Struts 2, you can use the stream result (struts 2 stream result)!

[Srikanth Madasu]

Thank you guys for your replies..