Calculator Program Using Jsp And Servlet
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How to create a simple calculator program using JSP and Servlet
In this tutorial, we will learn how to create a simple calculator program using Java Server Pages (JSP) and Servlet. JSP is a technology that allows us to create dynamic web pages with Java code embedded in HTML. Servlet is a Java class that runs on the server and handles HTTP requests and responses.
The calculator program will perform basic arithmetic operations such as addition, subtraction, multiplication and division. It will have two input fields for the operands and four buttons for the operators. It will also display the result of the calculation on the same page.
To create the calculator program, we need to follow these steps:
Create a JSP file named calculator.jsp that contains the HTML code for the user interface of the calculator.
Create a Servlet class named CalculatorServlet that handles the logic of the calculation and sends the result back to the JSP file.
Configure the web.xml file to map the URL of the JSP file to the Servlet class.
Run the program on a web server such as Tomcat and test it on a browser.
Let's see each step in detail.
Step 1: Create calculator.jsp
The calculator.jsp file contains the HTML code for the user interface of the calculator. It has two input fields for the operands, four buttons for the operators, and a span element for displaying the result. It also has a form element that submits the data to the Servlet class using the POST method. The code for calculator.jsp is shown below:
<%@ page contentType=\"text/html;charset=UTF-8\" language=\"java\" %>
<html>
<head>
<title>Calculator Program</title>
</head>
<body>
<h1>Calculator Program</h1>
<form action=\"CalculatorServlet\" method=\"post\">
<p>Enter first number: <input type=\"number\" name=\"num1\" required></p>
<p>Enter second number: <input type=\"number\" name=\"num2\" required></p>
<p>Choose an operator:</p>
<p>
<input type=\"submit\" name=\"op\" value=\"+\">
<input type=\"submit\" name=\"op\" value=\"-\">
<input type=\"submit\" name=\"op\" value=\"*\">
<input type=\"submit\" name=\"op\" value=\"/\">
</p>
<p>Result: <span id=\"result\"></span></p>
</form>
</body>
</html>
The <%@ page %> directive specifies the content type, character encoding and scripting language of the JSP file. The <form> element has an action attribute that specifies the URL of the Servlet class that will handle the data. The method attribute specifies that the data will be sent using the POST method. The <input> elements have name and value attributes that will be used by the Servlet class to get the data. The <span> element has an id attribute that will be used by the Servlet class to set the result.
Step 2: Create CalculatorServlet
The CalculatorServlet class is a Java class that extends the HttpServlet class and overrides its doPost method. The doPost method takes two parameters: an HttpServletRequest object that represents the request from the client, and an HttpServletResponse object that represents the response to be sent back to the client. The code for CalculatorServlet is shown below:
// Import required packages
import java.io.IOException a474f39169