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Why is it not working ?

Posted on 2003-02-25
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Last Modified: 2013-11-24
Hi,
 Here's the result (below), but where's the (picture/gifs) ?


My Local Host -(Http://Local/servlet/coreservlets.PersistentConnection)

/servlet/coreservlets/bullets/b01lis.gif  /servlet/coreservlets/bullets/b02lis.gif  /servlet/coreservlets/bullets/b03lis.gif  /servlet/coreservlets/bullets/b04lis.gif  /servlet/coreservlets/bullets/b05lis.gif  /servlet/coreservlets/bullets/b06lis.gif  /servlet/coreservlets/bullets/b07lis.gif  /servlet/coreservlets/bullets/b08lis.gif  /servlet/coreservlets/bullets/b09lis.gif  /servlet/coreservlets/bullets/b010lis.gif  /servlet/coreservlets/bullets/b011lis.gif  /servlet/coreservlets/bullets/b012lis.gif  /servlet/coreservlets/bullets/b013lis.gif  /servlet/coreservlets/bullets/b014lis.gif  /servlet/coreservlets/bullets/b015lis.gif  /servlet/coreservlets/bullets/b016lis.gif  /servlet/coreservlets/bullets/b017lis.gif  /servlet/coreservlets/bullets/b018lis.gif  /servlet/coreservlets/bullets/b019lis.gif  /servlet/coreservlets/bullets/b020lis.gif  /servlet/coreservlets/bullets/b021lis.gif  /servlet/coreservlets/bullets/b022lis.gif  /servlet/coreservlets/bullets/b023lis.gif  /servlet/coreservlets/bullets/b024lis.gif  /servlet/coreservlets/bullets/b025lis.gif  /servlet/coreservlets/bullets/b026lis.gif  /servlet/coreservlets/bullets/b027lis.gif  /servlet/coreservlets/bullets/b028lis.gif  /servlet/coreservlets/bullets/b029lis.gif


And here's the codes..



[PersistentConnection.java]
package coreservlets;

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;

/** Illustrates the value of persistent HTTP Connections for
*   pages that include many images, applet classes, or
*   other auxiliary content that would otherwise require
*   a separate connection to retrieve.
*/

public class PersistentConnection extends HttpServlet {
  public void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
     response.setContentType("text/html");
     ByteArrayOutputStream byteStream = new ByteArrayOutputStream(7000);
      PrintWriter out = new PrintWriter(byteStream,true);
      String persistenceFlag = request.getParameter("usePersistence");
       boolean usePersistence = ((persistenceFlag == null) ||
                                (!persistenceFlag.equals("no")));
       String title;
       if (usePersistence) {
         title = "PRUWeb is Using Persistent Connection";
         } else {
         title = "PRUWeb Not Using Persistent Connection";
         }

         out.println(ServletUtilities.headWithTitle(title) +
            "<BODY BGCOLOR=\"#FDF5E6\">\n" +
            "<H1 ALIGN=\"CENTER\">" + title + "</H1>");
         int numImages = 30;

         int n = 1;
//       String le = "/servlet/coreservlets.ImageRetriever?gifLocation=" +
//                   "servlet/coreservlets/bullet/b0" + n + "lis.gif";

         String le = "/servlet/coreservlets/bullets/b0" + n + "lis.gif";


         for(int i=1; i<numImages; i++) {
           out.println(makeImage(i, usePersistence));
//           le = "/servlet/coreservlets.ImageRetriever?gifLocation=" +
//                "servlet/coreservlets/bullets/b0" + i + "lis.gif";
           le = "/servlet/coreservlets/bullets/b0" + i + "lis.gif";


           out.println(le);
           
         }

         out.println("</BODY></HTML>");
         if (usePersistence) {
           response.setContentLength(byteStream.size());
         }
           byteStream.writeTo(response.getOutputStream());
        }

        private String makeImage(int n, boolean usePersistence) {
           String file = "/servlet/coreservlets.ImageRetriever?gifLocation=" +
                       "/bullets/b0" + n + "lis.gif";        

//      String file = "/servlet/coreservlets/bullets/b0" + n + "lis.gif";        


         if (!usePersistence)
            file = file + "&usePersistence=no";
            return("<IMG SRC=\"" + file + "\"\n" +
                   "     WIDTH=6 HEIGHT=6 ALT=\"\">");          

        }

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




[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;

        while((imageByte = in.read()) != -1) {
               byteStream.write(imageByte);
        }

        in.close();
        String persistenceFlag = request.getParameter("usePersistence");
        boolean usePersistence = (( persistenceFlag == null) ||
                                  (!persistenceFlag.equals("no")));
        response.setContentType("image/gif");
        if (usePersistence) {
                response.setContentLength(byteStream.size());
        }


        byteStream.writeTo(response.getOutputStream());
       } catch(IOException ioe) {
         reportError(response, "Error:  " + ioe);
      }
     }

     public void reportError(HttpServletResponse response, String message)
        throws IOException {
           response.sendError(response.SC_NOT_FOUND, message);
     }
    }




Thanx




0
Comment
Question by:wzm
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6 Comments
 

Expert Comment

by:lEx
ID: 8015648
Can you put source code of output HTML file...?
0
 

Expert Comment

by:reliant_energy
ID: 8017032
The output of HTML file like IEx state please.
0
 

Author Comment

by:wzm
ID: 8021790
Here it is..

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD><TITLE>Web is Using Persistent Connection</TITLE></HEAD>
<BODY BGCOLOR="#FDF5E6">
<H1 ALIGN="CENTER">PRUWeb is Using Persistent Connection</H1>
<IMG SRC="/servlet/coreservlets.ImageRetriever?gifLocation=/bullets/b01lis.gif"
     WIDTH=6 HEIGHT=6 ALT="">
/servlet/coreservlets/bullets/b01lis.gif
<IMG SRC="/servlet/coreservlets.ImageRetriever?gifLocation=/bullets/b02lis.gif"
     WIDTH=6 HEIGHT=6 ALT="">
/servlet/coreservlets/bullets/b02lis.gif
<IMG SRC="/servlet/coreservlets.ImageRetriever?gifLocation=/bullets/b03lis.gif"
     WIDTH=6 HEIGHT=6 ALT="">
/servlet/coreservlets/bullets/b03lis.gif
<IMG SRC="/servlet/coreservlets.ImageRetriever?gifLocation=/bullets/b04lis.gif"
     WIDTH=6 HEIGHT=6 ALT="">
/servlet/coreservlets/bullets/b04lis.gif
<IMG SRC="/servlet/coreservlets.ImageRetriever?gifLocation=/bullets/b05lis.gif"
     WIDTH=6 HEIGHT=6 ALT="">
/servlet/coreservlets/bullets/b05lis.gif
<IMG SRC="/servlet/coreservlets.ImageRetriever?gifLocation=/bullets/b06lis.gif"
     WIDTH=6 HEIGHT=6 ALT="">
/servlet/coreservlets/bullets/b06lis.gif
<IMG SRC="/servlet/coreservlets.ImageRetriever?gifLocation=/bullets/b07lis.gif"
     WIDTH=6 HEIGHT=6 ALT="">
/servlet/coreservlets/bullets/b07lis.gif
<IMG SRC="/servlet/coreservlets.ImageRetriever?gifLocation=/bullets/b08lis.gif"
     WIDTH=6 HEIGHT=6 ALT="">
/servlet/coreservlets/bullets/b08lis.gif
<IMG SRC="/servlet/coreservlets.ImageRetriever?gifLocation=/bullets/b09lis.gif"
     WIDTH=6 HEIGHT=6 ALT="">
/servlet/coreservlets/bullets/b09lis.gif
<IMG SRC="/servlet/coreservlets.ImageRetriever?gifLocation=/bullets/b010lis.gif"
     WIDTH=6 HEIGHT=6 ALT="">
/servlet/coreservlets/bullets/b010lis.gif
<IMG SRC="/servlet/coreservlets.ImageRetriever?gifLocation=/bullets/b011lis.gif"
     WIDTH=6 HEIGHT=6 ALT="">
/servlet/coreservlets/bullets/b011lis.gif
<IMG SRC="/servlet/coreservlets.ImageRetriever?gifLocation=/bullets/b012lis.gif"
     WIDTH=6 HEIGHT=6 ALT="">
/servlet/coreservlets/bullets/b012lis.gif
<IMG SRC="/servlet/coreservlets.ImageRetriever?gifLocation=/bullets/b013lis.gif"
     WIDTH=6 HEIGHT=6 ALT="">
/servlet/coreservlets/bullets/b013lis.gif
<IMG SRC="/servlet/coreservlets.ImageRetriever?gifLocation=/bullets/b014lis.gif"
     WIDTH=6 HEIGHT=6 ALT="">
/servlet/coreservlets/bullets/b014lis.gif
<IMG SRC="/servlet/coreservlets.ImageRetriever?gifLocation=/bullets/b015lis.gif"
     WIDTH=6 HEIGHT=6 ALT="">
/servlet/coreservlets/bullets/b015lis.gif
<IMG SRC="/servlet/coreservlets.ImageRetriever?gifLocation=/bullets/b016lis.gif"
     WIDTH=6 HEIGHT=6 ALT="">
/servlet/coreservlets/bullets/b016lis.gif
<IMG SRC="/servlet/coreservlets.ImageRetriever?gifLocation=/bullets/b017lis.gif"
     WIDTH=6 HEIGHT=6 ALT="">
/servlet/coreservlets/bullets/b017lis.gif
<IMG SRC="/servlet/coreservlets.ImageRetriever?gifLocation=/bullets/b018lis.gif"
     WIDTH=6 HEIGHT=6 ALT="">
/servlet/coreservlets/bullets/b018lis.gif
<IMG SRC="/servlet/coreservlets.ImageRetriever?gifLocation=/bullets/b019lis.gif"
     WIDTH=6 HEIGHT=6 ALT="">
/servlet/coreservlets/bullets/b019lis.gif
<IMG SRC="/servlet/coreservlets.ImageRetriever?gifLocation=/bullets/b020lis.gif"
     WIDTH=6 HEIGHT=6 ALT="">
/servlet/coreservlets/bullets/b020lis.gif
<IMG SRC="/servlet/coreservlets.ImageRetriever?gifLocation=/bullets/b021lis.gif"
     WIDTH=6 HEIGHT=6 ALT="">
/servlet/coreservlets/bullets/b021lis.gif
<IMG SRC="/servlet/coreservlets.ImageRetriever?gifLocation=/bullets/b022lis.gif"
     WIDTH=6 HEIGHT=6 ALT="">
/servlet/coreservlets/bullets/b022lis.gif
<IMG SRC="/servlet/coreservlets.ImageRetriever?gifLocation=/bullets/b023lis.gif"
     WIDTH=6 HEIGHT=6 ALT="">
/servlet/coreservlets/bullets/b023lis.gif
<IMG SRC="/servlet/coreservlets.ImageRetriever?gifLocation=/bullets/b024lis.gif"
     WIDTH=6 HEIGHT=6 ALT="">
/servlet/coreservlets/bullets/b024lis.gif
<IMG SRC="/servlet/coreservlets.ImageRetriever?gifLocation=/bullets/b025lis.gif"
     WIDTH=6 HEIGHT=6 ALT="">
/servlet/coreservlets/bullets/b025lis.gif
<IMG SRC="/servlet/coreservlets.ImageRetriever?gifLocation=/bullets/b026lis.gif"
     WIDTH=6 HEIGHT=6 ALT="">
/servlet/coreservlets/bullets/b026lis.gif
<IMG SRC="/servlet/coreservlets.ImageRetriever?gifLocation=/bullets/b027lis.gif"
     WIDTH=6 HEIGHT=6 ALT="">
/servlet/coreservlets/bullets/b027lis.gif
<IMG SRC="/servlet/coreservlets.ImageRetriever?gifLocation=/bullets/b028lis.gif"
     WIDTH=6 HEIGHT=6 ALT="">
/servlet/coreservlets/bullets/b028lis.gif
<IMG SRC="/servlet/coreservlets.ImageRetriever?gifLocation=/bullets/b029lis.gif"
     WIDTH=6 HEIGHT=6 ALT="">
/servlet/coreservlets/bullets/b029lis.gif
</BODY></HTML>
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Expert Comment

by:lEx
ID: 8024181
First : "/servlet/coreservlets.ImageRetriever?gifLocation=/bullets/b029lis.gif" - it's not a gif file source, if you use it in <img> tag result is nothing.
------------------------------------------------------

Second : I think what You want should be done this way :

return("<A SRC=\"" + file + "\"\n" +
                  "     WIDTH=6 HEIGHT=6 ALT=\"\"></A");  

NOT!!

return("<IMG SRC=\"" + file + "\"\n" +
                  "     WIDTH=6 HEIGHT=6 ALT=\"\">");

(may be I'm wrong)

-------------------------------------------------------

Any way <img> tag should contain Image path, not any else(Servlet too).
Can You describe what you trying to do with your ImageRetriever servlet??
0
 

Expert Comment

by:modulo
ID: 8194715
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