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Servlet displaying an image

Anthony Smith
Ranch Hand

Joined: Sep 10, 2001
Posts: 285
I want to use my servlet as the src for an <img> tag in a jsp page. That servlet should display a picture, that is not located in the webapp.
David O'Meara
Rancher

Joined: Mar 06, 2001
Posts: 13459

The short answer is that you need to get a java.awt.Image and a java.awt.Graphics context to draw on it, then get a separate package to convert it into the image type of choice.
I use the com.sun.image.codec.jpeg.* package that comes with Java, but it's unsupported and generally not recommended. You'd be able to find others out there.
The slightly longer answer is:

Dave
Anthony Smith
Ranch Hand

Joined: Sep 10, 2001
Posts: 285
Thanks for your help.
Along with this website and your help
http://developpeur.journaldunet.com/ressource/java/ja_effets_jpeggenerator.shtml
I can do a servlet called by an <IMG SRC> tag, but it shows a pic (Black box), but now I dont know how to use my own image calling the BufferedImage img or Image img class in java.
Anthony Smith
Ranch Hand

Joined: Sep 10, 2001
Posts: 285
Ok, I got it to work, but what about with GIFs?
Justin Chu
Ranch Hand

Joined: Apr 19, 2002
Posts: 209
    
    1
// FOR GIF, change content type accordingly. I'm not sure what's the content type of GIF files.
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class ImageLoader extends HttpServlet{
public ImageLoader() {}
public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
res.setContentType("image/jpeg");
File image = new File("/home/chu/image01.jpg");
FileInputStream fis = new FileInputStream(image);
OutputStream out = res.getOutputStream();
DataOutputStream ds = new DataOutputStream(out);
byte b[] = new byte [32*1024];
while (fis.read(b) != -1){
ds.write(b);
}
}
}
 
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