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 :-
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>
}
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