You
can define commonly used constants and functions in one file and
include that file into specific jsp file. The code included using
'include' directive included at compile time.
common.jsp
<%! final double PI = 3.14; double getArea(int r){ return PI*r*r; } %>
common.jsp
file contains, the java code to calculate area of the circle.
circle.jsp
<%@page contentType="text/html" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Area Of Circle</title> </head> <body> <%@ include file="common.jsp" %> <h1>Area of circle is <% int r = Integer.parseInt(request.getParameter("radius")); %> <%=getArea(r)%> </h1> </body> </html>
By
using include tag, java code is included in 'circle.jsp' file.
<%@
include file="common.jsp" %>
index.html
<!DOCTYPE html> <html> <head> <title>Area Of Circle</title> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> </head> <body> <form method="get" action="circle.jsp"> Enter radius <input type="text" name="radius" required="required"/><br /> <input type="submit" /> </form> </body> </html>
Output
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