"     WIDTH=6 HEIGHT=6 ALT=\"\">");

  }    

  public void doPost(HttpServletRequest request,

                     HttpServletResponse response)

      throws ServletException, IOException {

    doGet(request, response);

  }

}

Listing 7.7  ImageRetriever.java 

package coreservlets;

import java.io.*;

import javax.servlet.*;

import javax.servlet.http.*;

/** A servlet that reads a GIF file off the local system

 *  and sends it to the client with the appropriate MIME type.

 *  Includes the Content Length header to support the

 *  use of persistent HTTP connections unless explicitly

 *  instructed not to through "usePersistence=no".

 *  Used by the PersistentConnection servlet.

*/

public class ImageRetriever extends HttpServlet {

  public void doGet(HttpServletRequest request,

                    HttpServletResponse response)

      throws ServletException, IOException {

    String gifLocation = request.getParameter("gifLocation");

    if ((gifLocation == null) ||

        (gifLocation.length() == 0)) {

      reportError(response, "Image File Not Specified");

      return;

    }

    String file = getServletContext().getRealPath(gifLocation);

    try {

      BufferedInputStream in =

        new BufferedInputStream(new FileInputStream(file));

      ByteArrayOutputStream byteStream =

        new ByteArrayOutputStream(512);

      int imageByte;

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