Dynamic images with JSP

Hello,
I am using NetBeans to make a WebApp. I have an image to display on Page3.jsp that is generated during the navigation from the previous page, Page2.jsp. This image is a png file, and is unique graph generated for each visitor. Is there a simple way to display dynamically created images? I have searched for tutorials and asked my good pal Google but to no avail.
(FYI: At present, I am saving the images in a folder I have created beneath the 'web' folder, called 'web/images'. Netbeans asks me if I want to reload the image only after the previous, old image has been sent out by the server. I am producing and creating the image with the button_action method of Page2.jsp that then sends the user to Page3.jsp, where the image is to be displayed. Once the image is reloaded, I can refresh the web page and the correct image appears.)
Any help would be greatly appreciated.
Thanks,
Taivo

Although I have never implemented this, I know it is possible and I can point you in the right direction. If you already have the code to create the .png image, it shouldn't be too difficult to modify the image code into a servlet to serve nothing but the image (and leave rest of the html in place). Just as the page is writen to an output stream from the request for page.jsp (by the servlet created by the jsp parser), a request for an image can be handled by a servlet.
//this is in page3.jsp as plain HTML
<img src="/servlet/graph?user=aUser" />This servlet (graph.class) draws ths image, but instead of writing it to a file, writes it to the response stream.
Hope this helps,
Bamkin

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Dynamic images in JSP

Hi!
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Thanks!!

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X--spYro--X

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Dynamic imaging in jsp doesnt work

          Hi,
          The following piece of code works in tomcat but does not work in weblogic. can
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          ServletOutputStream sos = response.getOutputStream();
          JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(sos);
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          %>
          Thanx in advance.
          regards,
          Subramaniam


          Thanx a lot.Just read your solution again. Didnt get it the first time .Its pretty
          interesting.I think i will opt for the servlets solution.
          Dimitri Rakitine <[email protected]> wrote:
          >I thought I did. This version works (on 6.1 at least) :
          >
          >----------
          ><%@ page contentType="image/jpeg" import="java.awt.*,java.awt.image.*,com.sun.image.codec.jpeg.*,java.util.*"%><%
          >
          >// Create image
          >int width=200, height=200;
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          >
          >// Get drawing context
          >Graphics g = image.getGraphics();
          >
          >// Fill background
          >g.setColor(Color.white);
          >g.fillRect(0, 0, width, height);
          >
          >// Create random polygon
          >Polygon poly = new Polygon();
          >Random random = new Random();
          >for (int i=0; i < 5; i++) {
          > poly.addPoint(random.nextInt(width),
          > random.nextInt(height));
          >}
          >
          >// Fill polygon
          >g.setColor(Color.cyan);
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          >ServletOutputStream sos = response.getOutputStream();
          >JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(sos);
          >encoder.encode(image);
          >%>
          >----------
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          >Subramaniam <[email protected]> wrote:
          >
          >> Hi,
          >
          >> There is out.println("\n")'s in the java file generated by weblogic.
          >There is
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          >as to what
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          >> Thanx in advance,
          >
          >> Subramaniam
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          >> Dimitri Rakitine <[email protected]> wrote:
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          >>>JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(sos);
          >>>encoder.encode(image);
          >>>%>
          >>>
          >>>Subramaniam <[email protected]> wrote:
          >>>
          >>>> Hi,
          >>>
          >>>> The following piece of code works in tomcat but does not work in
          >weblogic.
          >>>can
          >>>> anybody please help me with this.
          >>>
          >>>
          >>>
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          >>>> Graphics g = image.getGraphics();
          >>>
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          >>>> g.setColor(Color.white);
          >>>> g.fillRect(0, 0, width, height);
          >>>
          >>>> // Create random polygon
          >>>> Polygon poly = new Polygon();
          >>>> Random random = new Random();
          >>>> for (int i=0; i < 5; i++) {
          >>>> poly.addPoint(random.nextInt(width),
          >>>> random.nextInt(height));
          >>>> }
          >>>
          >>>> // Fill polygon
          >>>> g.setColor(Color.cyan);
          >>>> g.fillPolygon(poly);
          >>>
          >>>> // Dispose context
          >>>> g.dispose();
          >>>
          >>>> // Send back image
          >>>> ServletOutputStream sos = response.getOutputStream();
          >>>> JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(sos);
          >>>> encoder.encode(image);
          >>>> %>
          >>>
          >>>
          >>>> Thanx in advance.
          >>>> regards,
          >>>> Subramaniam
          >>>
          >>>--
          >>>Dimitri
          >
          >
          >--
          >Dimitri

Dynamic checkboxes with jsp

Hi,
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hi,
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* @author n48edf
* TODO To change the template for this generated type comment go to
* Window - Preferences - Java - Code Style - Code Templates
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Uploading images with jsp-PLEASE HELP

Hi
I would like to allow users to upload images(photos) from the website im doing.
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This is the jsp File which helps me to upload the file
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Bye for now
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Dynamic dropdown with jsp

Hi,
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i have one dropdown list box,which is holding source values, on selecting source the second dropdown list box should display destination values from database.
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<option value="">Select Source</option>
<option value="jfk">JFK</option>
<option value="heathrow">Heathrow</option>
<option value="cst">Mumbai</option>
<option value="chennai">Chennai</option>
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<%
while(rs.next())
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%>
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Here is my try which I done with [html tutorial|http://phpforms.net/tutorial/tutorial.html]. You can try to use it.
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<head>
<script language="javascript" type="text/javascript" >

</script>
</head>
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<option value="chennai">Chennai</option>
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hi jaspre,
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<welcome-file-list>
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main.jsp
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<img src="/ImageServlet" border="0" > If you could just tell me what i'm doing wrong here , or if you could show me your own solutions to that problem , i would be very greatful ,cos i'm realy stuck here , and i'm rather pressed for time too. Hope someone can help.

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Displaying an Image in an Excel Spreadsheet with JSP - URGENT

Hi Peoples
I can transfer the table I am using in to excel with JSP by doing:
<%@ page contentType ="application/vnd.ms-excel" %>
this works fine, though I have an image that sits within the table that I want to be displayed as well.
Can this be done?? If so how???
Thanks

Try to insert the image into sheet from it's URL not from it's local file path
Best regards

Problem with placing dynamic images.

I have a 800x600 file. It is being used for a PhotoSlide
show.
The images are displayed dynamically, as external files.
Some of the photos will be taken 1 hour before the
presentation, so I have
it set up to display img001.jpg, img002.jpg, img003.jpg as
external files.
Once the photos are taken, they'll be renamed, and placed in
the appropriate
folder, so that they'll appear in the presentation, without
having to
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I have the display icons for the images set to display the
image at 400,300,
which will center the image on-screen.
The problem is that when i change the images out, from a
verticle to a
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on screen
changes.
So how can I set the linked external file to ALWAYS display
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That doesn't change anything from when I had X = 400 and
Y=300.
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This is going to be a photo slideshow to be shown after a
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The problem is that the image's placement on-screen changes
when a different
size image is put in place.
For example, if i publish the authorware file, and i was
using a 720 x 480
image, everything works fine. But if i replace the external
image with a 480
x 720 image, the placement on screen is no longer set for the
center of the
image to appear at the dead center of the screen (400,300). I
need it to
work like this, since I don't know if the wedding photos
being added will be
set to portrait or landscape.
"Steve Howard **AdobeCommunityExpert**"
<steve@$NoSpam$tomorrows-key.com>
wrote in message news:e4t1rv$iv1$[email protected]..
>
>> So how can I set the linked external file to ALWAYS
display centered on
>> screen, no matter the orientation, or size of the
picture.
>
>
>
> Set the display icon Positioning property to On Screen.
Set the Initial X
> location to WindowWidth/2
> Set the Initial Y location to WindowHeight/2
>
>
> Steve
>
>
> --
> ACE - Adobe Community Expert, Authorware
> My blog -
http://stevehoward.blogspot.com/
> Authorware tips -
http://www.tomorrows-key.com

Create dynamic image, dump on server someplace and reference in JSP?

I was thinking about creating dynamic images and referencing them on a JSP
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Assign an ID (e.g. 1234) to the uploaded file. You should abstract the store
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          http://www.tangosol.com/coherence.jsp
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          "PHenry" <[RemoveBeforeSending][email protected]> wrote in message
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          > stream, how do you reference it in the html/jsp file? I just thought
          about
          > that now as I was getting a cup of coffee. (I need to cut back! :>)
          >
          > Thanks.
          >
          >
          >
          >
          > "Cameron Purdy" <[email protected]> wrote in message
          > news:[email protected]...
          > > If you write it to a file, you are writing it to an OutputStream, right?
          > >
          > > Instead, just write it to the OutputStream that comes from the
          HttpRequest
          > > object. For example:
          > >
          > > <img src="http://www.mysite.com/myapp/my.jsp?name=whatever">
          > >
          > > That would hit your JSP (it would be better to use a Servlet in this
          case
          > > though), and you would stream back the image.
          > >
          > > Peace,
          > >
          > > Cameron Purdy
          > > Tangosol, Inc.
          > > http://www.tangosol.com/coherence.jsp
          > > Tangosol Coherence: Clustered Replicated Cache for Weblogic
          > >
          > >
          > > "PHenry" <[RemoveBeforeSending][email protected]> wrote in message
          > > news:[email protected]...
          > > > Interesting. I'm still a bit new to this stuff. Do you have/know
          where
          > > to
          > > > find some examples?
          > >
          > >
          > >
          >
          >

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If this post answers your question or helps. please mark it as such

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