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


This is the best example if you are a beginner on JSP and servlet, using this article you can easily know how JSP and Servlet will implement on an application.
I have explained two examples with multiple buttons under JSP and try to implement code under the servlet class.
If you want to know more about JSP and Servlet then you can read my previous articles then you can easily know.
Create a Java Web Project using Eclipse or Netbeans IDE and do the following step.

Now I am providing a simple example of JSP and Servlet with multiple buttons 

Example1:-

Step1st:- 

Create additionexample.jsp file and write following code:-

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body bgcolor="cyan">
<center>
<h1>Addition Program </h1>
<form action="Addser" method="post">

<input type="text" name="txtnum1" placeholder="Enter First Number" />
<br>
<br>
<input type="text" name="txtnum2" placeholder="Enter Second Number" />
<br>
<br>
<input type="submit" name="btnsubmit" value="+"  />
<br>
<br>
<input type="submit" name="btnsubmit" value="-"  />
<br>
<br>
<input type="submit" name="btnsubmit" value="*"  />
<br>
<br>
<input type="submit" name="btnsubmit" value="/"  />
<br>
</form>
<%
if(request.getParameter("q")!=null)
{
out.print("result is "+request.getParameter("q"));
}
%>
</center>
</body>
</html>

2) create servlet class and write the following code:-

package scs;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/Addser")
public class Addser extends HttpServlet {
private static final long serialVersionUID = 1L;        
    public Addser() {
        super();
        // TODO Auto-generated constructor stub
    }
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//PrintWriter out = response.getWriter();
int a = Integer.parseInt(request.getParameter("txtnum1"));
int b = Integer.parseInt(request.getParameter("txtnum2"));
int c=0;
if(request.getParameter("btnsubmit").equals("+"))
{
c= a+b;
}
else if(request.getParameter("btnsubmit").equals("-"))
{
c=a-b;
}
else if(request.getParameter("btnsubmit").equals("*"))
{
  c=a*b;
}
else if(request.getParameter("btnsubmit").equals("/"))
{
c=a/b;
}
response.sendRedirect("additionexample.jsp?q="+c);
//out.print(c);
}
}

Example 2:-

Create a Simple Calculator using Multiple Button:-

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 coding :-
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 CalcSer extends HttpServlet {
    static int num1,num2;
       protected void doPostt(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"));
             }        
           }
    }  
}

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