java - How to retrieve "Grouped" items from HTML form using Servlet?

I am having an issue with retriving "grouped" data from
HTML form to servlet. I will describve the scenario
below.

In companies, they record the salary of the
employees once a month.When they record it, they do not do it by visiting each an every
employees personal "profile" (or whatever according to the system). Instead what they do
is apply the salaries of all of them in one page.

To do the
above thing they prefer excel like tabular sheets.

Now, I
have a html form, where the form content is a table. One row is dedicated to a one
employee.

Below is my
form.

<%--
 Document :
            index2
 Created on : Mar 5, 2015, 10:04:45
            AM
--%>
<%@page contentType="text/html"
            pageEncoding="UTF-8"%>
            html>

 
             http-equiv="Content-Type" content="text/html; charset=UTF-8">

            
 

            
 
Hello World!
             method="post" action="EmployeeSampleServlet">
             style="width:100%">







            name="tableBody" value="1">
 
















            value="3">

















            value="5">








 
            
Name
 
Position
            
Salary
 
 
 
            type="text" name="nameTxt" style="width:100%"/>
            
            style="width:100%"/>
 
            name="salaryTxt" style="width:100%"/>
 
            
 
            
 
            style="width:100%"/>
 
            name="positionTxt" style="width:100%"/>
 
            type="text" name="salaryTxt" style="width:100%"/>
            
 
 
 
 
            name="nameTxt" style="width:100%"/>
 
            type="text" name="positionTxt" style="width:100%"/>
            
            style="width:100%"/>
 
            
 
            
 
            style="width:100%"/>
 
            name="positionTxt" style="width:100%"/>
 
            type="text" name="salaryTxt" style="width:100%"/>
            
 
 
 
 
            name="nameTxt" style="width:100%"/>
 
            type="text" name="positionTxt" style="width:100%"/>
            
            style="width:100%"/>
 
            
 
 
             value="Submit">
 

            

As
you can see, I have wrapped every row with a . The
value attribute of the
will contain the employee id.

Once the form is submitted,
the below servlet will capture it.

import
            java.io.IOException;
import java.io.PrintWriter;
import
            javax.servlet.ServletException;
import
            javax.servlet.http.HttpServlet;
import
            javax.servlet.http.HttpServletRequest;
import
            javax.servlet.http.HttpServletResponse;
public class EmployeeSampleServlet
            extends HttpServlet {
 protected void processRequest(HttpServletRequest
            request, HttpServletResponse response)
 throws ServletException, IOException
            {
 response.setContentType("text/html;charset=UTF-8");
 PrintWriter
            out = response.getWriter();
 String[]empId =
            request.getParameterValues("tableBody");
 for(int
            i=0;i {
 out.println(empId[i]);

            }
 }
 // 

            /**
 * Handles the HTTP GET method.

            *
 * @param request servlet request
 * @param response servlet
            response
 * @throws ServletException if a servlet-specific error
            occurs
 * @throws IOException if an I/O error occurs
 */

            @Override
 protected void doGet(HttpServletRequest request,
            HttpServletResponse response)
 throws ServletException, IOException
            {
 processRequest(request, response);
 }
 /**
 *
            Handles the HTTP POST method.
 *
 * @param
            request servlet request
 * @param response servlet response
 *
            @throws ServletException if a servlet-specific error occurs
 * @throws
            IOException if an I/O error occurs
 */
 @Override

            protected void doPost(HttpServletRequest request, HttpServletResponse
            response)
 throws ServletException, IOException {

            processRequest(request, response);
 }
 /**
 * Returns a
            short description of the servlet.
 *
 * @return a String containing
            servlet description
 */
 @Override
 public String
            getServletInfo() {
 return "Short description";
 }//
            
}

What
I was trying is get the value attribute of
(so I can identify the id of the employee) and
get the data inside that . However this didn't
work, because I ended up with NullpointerException because it
failed to read the
value.

So, how can I pass the data from table to servlet
where it can clearly understand that one row is representing data belong to a one
employee? If this is not the way to do it, I am also open for other
methods.