Java, .NET, PHP, PYTHON, ANGULAR, .NET, ML, Data Scince, Testing, CI Tutorials in Easy Languages.

"Best Software Training, Internship, Project Development center of Indore India, Helpline 780506-3968"

Simple Calculator Program in JSP To Servlet,Create Calculator using JSP and Servlet

Create a Java Web Project:-

Create Index.jsp for designing:-



<%@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" value="<% if(request.getParameter("q")!=null) out.print(request.getParameter("q"));    %>" />
            <br><br>
            <input type="submit" name="btnsubmit" value="1" />
            <input type="submit" name="btnsubmit" value="2" />
            <input type="submit" name="btnsubmit" value="3" />
            <input type="submit" name="btnsubmit" value="4" />
            <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>


Create Servlet Class for :-

/*
 * 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 {

    static int num1,num2;
    /**
     * 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()) {
            if(request.getParameter("btnsubmit").equals("+"))
            {
              num1 = Integer.parseInt(request.getParameter("txtnum1"));
               
               response.sendRedirect("index.jsp?q1="+num1);
               
            }
            else if(request.getParameter("btnsubmit").equals("="))
            {
               
               int num3 = num1+Integer.parseInt(request.getParameter("txtnum1"));
               response.sendRedirect("index.jsp?q="+num3);
               
            }
             else if(request.getParameter("txtnum1")!=null)
               response.sendRedirect("index.jsp?q="+(request.getParameter("txtnum1")+request.getParameter("btnsubmit")));
             
           
           else
             {
                 if(request.getParameter("q1")!=null)
                 response.sendRedirect("index.jsp?q="+request.getParameter("btnsubmit")+"&q1="+request.getParameter("q1"));
                 else
                 response.sendRedirect("index.jsp?q="+request.getParameter("btnsubmit"));
             }
          
         
        }
    }

    // <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>

}







Post a Comment

If you have any doubt in programming or join online classes then you can contact us by comment .

Previous Post Next Post