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Java Image processing and Servlets

3 replies on 1 page. Most recent reply: Aug 12, 2002 6:36 AM by Jay Kandy

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MadanGopal Mathur

Posts: 3
Nickname: mgm
Registered: Aug, 2002

Java Image processing and Servlets

Posted: Aug 8, 2002 11:08 PM

Hi all,

I need help. Right now, I have a java program which is creating,manipulating and displaying images on the screen.
What I want to do next is to use servlets(tomcat) to send this image to a web browser to be displayed there using either a doGet() or doPost().

I am confused as to how I would compile this code, if I cannot have a main() which is very necessary for image generation...,I am lost.

If you guys can let me know any ideas on how to go about it, I will really appreciate it.

Any links or example code is very welcome.

Thanks
MGM

Don Hill

Posts: 70
Nickname: ssswdon
Registered: Jul, 2002

Re: Java Image processing and Servlets

Posted: Aug 9, 2002 1:09 PM

You will need to do a servlet mapping in the web.xml, this is a mapping from the java class to a url.The servlet container will call the goGet, doPost. You will need to write the html to the response outputstream.

HTH

MadanGopal Mathur

Posts: 3
Nickname: mgm
Registered: Aug, 2002

Re: Java Image processing and Servlets

Posted: Aug 10, 2002 12:04 AM

Hi Don,

Thanks a lot for a reply.I will look up on servlet mapping some more.It would help me to a great extent, if u could send me an example code if any or point me to a link to such examples on the web. Because I am using Java Servlet Programming text by Hunter & Crawford and I didn't see much about servlet mapping in it to solve my problem.

Thanks
MGM

Jay Kandy

Posts: 77
Nickname: jay
Registered: Mar, 2002

Re: Java Image processing and Servlets

Posted: Aug 12, 2002 6:36 AM

Mathur,

Heres what you need to do:

You said you have code to "manipulate" images. My guess is since images are binary, you write to an OutputStream to display on the screen (using a Panel or a container).

What you need to do is, set this stream to servlet's stream:

OutputStream ostream = response.getOutputStream();

get the stream and draw onto it.

and set the content type as the image type. For example, if you draw a PNG,
response.setContentType("image/png");

If you posted a piece of code, it would be easy to show!

Jay

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