Problem with showing a BLOB Image from DB

Question

Hi!
I am just trying to show an BLOB Image on my JSP site with the following Code in my getImage.jsp :
getImage.jsp:
response.setContentType("image/jpeg");
Blob blob = rs.getBlob("image");
if (blob != null)
int iLen = (int)blob.length();
ByteArrayOutputStream output = new ByteArrayOutputStream(iLen);
output.write(blob.getBytes(1, iLen), 0, iLen);
out.write(output.toString());
and my problem is following:
I just wrote the BLOB with the Stream on my browser window, and I compared the bytes with the original of a jpg.
the problem is, that it is the same, but when I use out.write( )... all "?" in the byte stream are shown in different signs, and so I am not able to show the Image!
Can anyone help me?
Yours, Klaus from Austria

Answer 1

Yes, as Tugdual said, a common way is to use Servlet to display binary output.
out.write(output.toString());Klaus, if you use ByteArrayOutputStream.toString(), then the platform's default character encoding is playing a role. If you use the jsp implicit variable "out", which is a java.io.writer, you are treating character stream instead of byte stream. These two kind of streams are totally different. So your browser are not receiving the same the bytes as in your original jpg. No wonder your are not able to see the image. That is one reason why JSP is not suitable for binary output.
Well, you can also use JSP tags to accomplish your task, like the Oracle® Application Server 10g Multimedia Tag Library for JSP User's Guide and Reference