<IMG src="/mywebapp/myimageservlet">

    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
    {

        File f = new File(System.getProperty("user.home")+"\\zoewrap.jpg");
        JPEGImageDecoder decoder = JPEGCodec.createJPEGDecoder(new FileInputStream(f));
        BufferedImage image =decoder.decodeAsBufferedImage() ;

        // Send back image
        ServletOutputStream sos = response.getOutputStream();
        JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(sos);
        encoder.encode(image);
    }

You can use either Java Advance Imaging JAI (com.sun.media.jai) or Java ImageIO (javax.imageio).

In case you are as confuse as I was about JAI and ImageIO, the short answer is: you should not use JAI anymore. It's old. JDK 1.4 shipped with javax.imageio to replace JAI. So, as long as you have JDK 1.4 or greater installed, no additional package is needed.

So, here's code to convert TIFF to whatever format in a JSP. In my example, to a GIF file.

<%@page import="javax.imageio.*"%>
<%@page import="java.awt.image.BufferedImage"%> 

<%
File myTifFile = new File("aTifFile.tif");

//Option1: write the converted gif file to disk
File myGifFile = new File("aGifFile.gif");
BufferedImage bufi = ImageIO.read(myTifFile);
ImageIO.write(bufi,"gif",myGifFile);

//Option2: send the converted gif file directly back to 
//browser. You must use setContentType, otherwise you will 
//end up with junk in your browser.
response.setContentType("image/gif"); 
ImageIO.write(bufi,"gif",response.getOutputStream());
%>

That's it! Isn't that easy!!! Another thing is, the documentation on Sun says ImageIO doesn't support writing to GIF format. But that's not the case, well, at least not in my case. I was able to convert a TIFF  file to a GIF file with no problem. The list of supported write formats may be obtained by:

<%
String[] writerFormatNames = ImageIO.getWriterFormatNames();

for (int i=0;i<writerFormatNames.length;i++) {
    System.out.println(writerFormatNames[i]);
}
%>

Here are some great  references:

• http://java.sun.com/developer/technicalArticles/Media/AdvancedImage/index.html
• http://java.sun.com/j2se/1.4.2/docs/guide/imageio/spec/apps.fm1.html

Hope this help.

Cheers,
Royce

CORRECTION:

The default javax.imageio comes with JDK 1.4.2 only supports limited image formats (both readers and writers).

In my previous post, I said "I was able to convert a TIFF file to a GIF file with no problem." because I didn't realize that I already have "Java Advanced Imaging Image I/O Tools" installed.

You can get Java Advanced Imaging Image I/O Tools at:
http://java.sun.com/products/java-media/jai/downloads/download-iio-1_0_01.html

If you don't have the tools package install, you will keep getting NULL from ImageIO.read(...) if you try to read in say a TIFF file.

On top of the your regular JDK, you will need the additional "Java Advanced Imaging Image I/O Tools" to read in your TIFF file. You can get it at:
http://java.sun.com/products/java-media/jai/downloads/download-iio-1_0_01.html


---The following is the JSP code---
<%@page import="javax.imageio.*"%>
<%@page import="java.awt.image.BufferedImage"%> 

<%
File myTifFile = new File("aTifFile.tif");

//Option1: write the converted gif file to disk
File myGifFile = new File("aGifFile.gif");
BufferedImage bufi = ImageIO.read(myTifFile);
ImageIO.write(bufi,"JPEG",myGifFile);

//Option2: send the converted gif file directly back to 
//browser. You must use setContentType, otherwise you will 
//end up with junk in your browser.
response.setContentType("image/JPEG"); 
ImageIO.write(bufi,"JPEG",response.getOutputStream());
%>

Good luck

but that will send only the image to the browser since you have set the response type to image/jpeg . how to embed the image along with other html tags.

for example i want to display the image along with an html form below the image