Create a simple calculator application using servlet.

byBsc IT March 19, 2022

index.html

<html>
<head>
<title>Calculator App</title>
</head>
<body>
<form action="CalculatorServlet" >
Enter First Number : <input type="text" name="txtN1" ><br> <br> Enter Second Number : <input type="text" name="txtN2" ><br> <br> Select an Operation :
<input type="radio" name="opr" value="+">ADDTION
<input type="radio" name="opr" value="-">SUBSTRACTION
<input type="radio" name="opr" value="*">MULTIPLY
<input type="radio" name="opr" value="/">DIVIDE <br> <br>
<input type="reset" value="Reset">
<input type="submit" value="Calculate" >
</form>
</body>
</html>

CalculatorServlet.java

package mypack;

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 CalculatorServlet extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response)                   throws ServletException, IOException {               response.setContentType("text/html;charset=UTF-8");            PrintWriter out = response.getWriter();

        double n1 = Double.parseDouble(request.getParameter("txtN1"));

        double n2 = Double.parseDouble(request.getParameter("txtN2"));

        double result =0;

        String opr=request.getParameter("opr");

if(opr.equals("+")) result=n1+n2;

if(opr.equals("-")) result=n1-n2;

if(opr.equals("")) result=n1n2;

if(opr.equals("/")) result=n1/n2;

out.println("<h1> Result = "+result);

    }

}

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