'How to Loop form elements in JSP

I'm want to use some sort of loop to go over all input fields in my form . But I'm unable to find any proper documentation on how to do it. Is it possible to loop over all the elements in my form in some way as well as dealing with multiple checkboxes ?

I tried to follow some online sources . This one outputs null value.

<html>
   <body>
      
      <form action = "main.jsp" method = "POST" target = "_blank">
         <input type = "checkbox" name = "maths" checked = "checked" /> Maths
         <input type = "checkbox" name = "physics"  /> Physics
         <input type = "checkbox" name = "chemistry" checked = "checked" /> Chemistry
         <input type = "submit" value = "Select Subject" />
      </form>
      
   </body>
</html>

<%@ page import = "java.io.*,java.util.*" %>

<html>
   <head>
      <title>HTTP Header Request Example</title>
   </head>

   <body>
      <center>
         <h2>HTTP Header Request Example</h2>
         <table width = "100%" border = "1" align = "center">
            <tr bgcolor = "#949494">
               <th>Param Name</th>
               <th>Param Value(s)</th>
            </tr>
            <%
               Enumeration paramNames = request.getParameterNames();
               while(paramNames.hasMoreElements()) {
                  String paramName = (String)paramNames.nextElement();
                  out.print("<tr><td>" + paramName + "</td>\n");
                  String paramValue = request.getHeader(paramName);
                  out.println("<td> " + paramValue + "</td></tr>\n");
               }
            %>
         </table>
      </center>
   
   </body>
</html>

Is there any documentation source from where I can read about request object's methods ?

htmlformsjsp


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