JSP / Servler Random Photo 1

tommyc7 · Mar 17, 2007

What I'm trying to do is probably very simple, but for some reason I'm drawing a complete blank on how to do it.

I am working on a web site that uses JSP / Servlets using Tomcat.

I have an image folder and let's say there are 5 images named photo1, photo2 ... photo5.

All I want to do is randomly display a different photo each time the page draws.

In Java, I understand how to use the File class and how to make things Random. I am pretty new at JSP, so I'm not sure if there's something there I can use.

The part that I'm stuck on, is how to structure the directory path so the File object can read the image directory inside the web server. (I've tried using a URI object, but have had no luck.)

Or, I don't mind dropping the whole File idea, if there's a better solution.

Thanks!

feherke · Mar 17, 2007

Hi

tommyc7 said:
All I want to do is randomly display a different photo each time the page draws.

You can just generate the image name in the JSP file :

Code:

[highlight bisque]   anything.jsp   [/highlight]
<html>
<body>
<% out.println("<img src=\"/path/to/image/photo"+((int) (Math.random()*5+1))+".jpg\">"); %>
</body>
</html>

Or generate it in the servlet and use it in the JSP :

Code:

[highlight bisque]   Anything.java   [/highlight]
[gray]//...[/gray]
request.setAttribute("imgNr",new Integer((int) (Math.random()*5+1)));
[gray]//...[/gray]



[highlight bisque]   anything.jsp   [/highlight]
<html>
<body>
<% out.println("<img src=\"/path/to/image/photo"+request.getAttribute("imgNr")+".jpg\">"); %>
</body>
</html>


[highlight bisque]   anything.jsp ( alternative using Struts Bean )  [/highlight]
<%@ taglib uri="struts-bean" prefix="bean" %>
<html>
<body>
<img src="/path/to/image/photo<bean:write name="imgNr"/>.jpg">
</body>
</html>


[highlight bisque]   anything.jsp ( alternative using Expression Language )  [/highlight]
<%@ page isELIgnored="false" %>
<html>
<body>
<img src="/path/to/image/photo${imgNr}.jpg">
</body>
</html>

Feherke.

http://rootshell.be/~feherke/

tommyc7 · Mar 17, 2007

Thanks!

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JSP / Servler Random Photo 1

tommyc7

Programmer

feherke

Programmer

tommyc7

Programmer

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