If you running the Web application using the Tomcat (Web-Server)
Follow:
1.try to search "Apache Software Foundation" then "Tomcat"
2.Create you Project folder inside of "Tomcat" (Ex:c:\..\Apache Software Foundation\Tomcat\webappps\Root\MyProject)
3.Inside of MyProject creating one folders .Don't Change the folder name it's case sensitive too.The folder name is WEB-INF
4.Then after creating two folders are classes and lib .
5. c:\..\Apache Software Foundation\Tomcat\webappps\Root\MyProject\WEB-INF\classes and c:\..\Apache Software Foundation\Tomcat\webappps\Root\MyProject\WEB-INF\lib
(Don't change the folder name WEB-INF it should be case-sensitive too.)
6.Creating the xml file the file name as web.xml
7.web.xml is the file it's described your deployment descriptor which are the preferences to the set in your web project.
8.For example, the session timeout,index page,database username ,database passwords,servlet etc.
9.Then creating the jsp file using the separate folder that folder is named for as your own wish.
10.But that is user understandable. (Ex.Jsp-folder name)
11.The style sheet (.css) and images (.img..jpeg,.gif) are maintained in the separate folder.
12.For example,css,images
13.All the css files are stored inside of the css folder and all the images are stored in the images folder.
14.Strucute are c:\..\Apache Software Foundation\Tomcat\MyProject\css and c:\..\Apache Software Foundation\Tomcat\MyProject\images
15.lib folder contains the supporting libraries and should be placed in the lib folder.
16.css can be using in the jsp files example (<link HREF="../theme/screens.css" REL="stylesheet" TYPE="text/css" >)