Servlet to display images in .jsp?

There is a lot of code already on this site. Search for ImageIO class.  For gif I used  code from acme.com but in Java 6 I think( ? )  this will no longer be necessary. You can run this code just to see the output.
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import javax.imageio.*;
import java.util.Arrays;
public class GetFormats {
  public static void main(String args[]) {
    String readFormats[] = ImageIO.getReaderMIMETypes();
    String writeFormats[] = ImageIO.getWriterMIMETypes();
    System.out.println("Readers: " +
        Arrays.asList(readFormats));
    System.out.println("Writers: " +
        Arrays.asList(writeFormats));
  }
}
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package tester. import Acme.JPM.Encoders.*;
import java.io.*;
import java.awt.*;
import java.awt.image.*;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.imageio.*;
public class Img2 extends HttpServlet {
      public void doGet(HttpServletRequest request,
                        HttpServletResponse response) throws IOException, ServletException
        {
             ServletOutputStream sos = response.getOutputStream();
             //The "Images" folder is presumed to be in your context's root folder.
             File imgFile = new File(getServletContext().getRealPath("/Images/smile.gif"));
             BufferedImage bi = ImageIO.read(imgFile);
             response.setContentType("image/gif");
             GifEncoder encoder = new GifEncoder(bi,sos);
             encoder.encode();
      }

}
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For jpeg I had the following JSP handy for testing.
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<%@ page import="java.awt.*, java.awt.image.*, java.util.*, java.io.*,javax.imageio.*,javax.imageio.stream.*" %><%
  int width=200, height=200;
  BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
  Graphics g = bi.getGraphics();
  g.setColor(Color.BLUE);
  g.fillRect(0, 0, width, height);
  g.dispose();
  response.setContentType("image/jpg");
  Iterator writers = ImageIO.getImageWritersByFormatName("jpg");
  ImageWriter writer = (ImageWriter)writers.next();
  ImageOutputStream ios = ImageIO.createImageOutputStream(response.getOutputStream());
  writer.setOutput(ios);
  writer.write(bi);
  ios.close();
  if(out!=null)return; %>
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Here is a another JSP.  You can rewrite to servlet.
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<%@ page import="java.io.*,javax.imageio.ImageIO"%><%
ImageIO.write(ImageIO.read(new File(application.getRealPath("/") + "MyPic.jpg")),"jpg",response.getOutputStream());%>
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>Should I be thinking of writing a separate servlet for each file type?  
You could do it either way. You will have to tell us more of your requirements.    rrz