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Create Salary Calculator using JSP Web forms and Servlet class

Salary Calculator program using JSP and Servlet
Code of JSP File:-
<%@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 bgcolor="gray">
    <center>
        <h1>Salary Calculator</h1>
        <form action="CalcSer" method="post">
            <input type="text" placeholder="Enter Basic" name="txtbasic" required="" />
            <br><br>
            <input type="text" placeholder="Enter TA" name="txtta" required="" />
            <br><br>
            <input type="text" placeholder="Enter DA" name="txtda" required=""/>
            <br><br>
            <input type="text" placeholder="Enter COMM"  name="txtcomm" required="" />
            <br><br>
            <input type="text" placeholder="Enter PF" name="txtpf" required=""  />
            <br><br>
            <input type="text" placeholder="Number of leave" name="txtlv" required=""  />
            <br><br>
            <input type="submit" name="btnsubmit" value="Calculate" />
        </form>
    </center>
    </body>
</html>
Code of Servlet:-
/*
 * 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 {  
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        try  {
          float basic = Float.parseFloat(request.getParameter("txtbasic"));
          float ta = Float.parseFloat(request.getParameter("txtta"));
          float da = Float.parseFloat(request.getParameter("txtda"));
          float comm = Float.parseFloat(request.getParameter("txtcomm"));
          float pf = Float.parseFloat(request.getParameter("txtpf"));
          float l = Float.parseFloat(request.getParameter("txtlv"));
          float tsal = basic+ta+da+comm;
          float nsal = tsal-(pf)-(tsal/30)*l;
          out.write("Salary is "+nsal);
        }
        catch(Exception ex)
        {
            out.print(ex.getMessage());
        }
    }
    // <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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