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JSP Form with Multiple Buttons with Single Servlet Class:- use Netbeans IDE
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Create Java Web Project and Design JSP Web pages


<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
        <form action="CalcSer" method="post">
            <input type="text" name="txtnum1" />
            <br><br>
            <input type="text" name="txtnum2" />
            <br><br>
            <input type="submit" name="btnsubmit" value="+" />
            <input type="submit" name="btnsubmit" value="-" />
            <input type="submit" name="btnsubmit" value="*" />
            <input type="submit" name="btnsubmit" value="/" />
        </form>
    </body>
</html>


Step2nd:-   Create Servlet Class and Write Following Code to manage data operation:-


/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
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;

/**
 *
 * @author Hp
 */
public class CalcSer extends HttpServlet {

    /**
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
     * methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        try (PrintWriter out = response.getWriter()) {
           int num1 = Integer.parseInt(request.getParameter("txtnum1"));
           int num2 = Integer.parseInt(request.getParameter("txtnum2"));
           int num3;
           if(request.getParameter("btnsubmit").equals("+"))
           {
           num3 =num1+num2;
           }
           else if(request.getParameter("btnsubmit").equals("-"))
           {
            num3 =num1-num2;
           }
            else if(request.getParameter("btnsubmit").equals("*"))
           {
           num3 =num1*num2;
           }
           else
           num3=num1/num2;     
            
            
            
           out.print(num3);
        }
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP <code>GET</code> 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 <code>POST</code> 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";
    }// </editor-fold>

}

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