A simple program that I wrote using JSTL or Java Server Pages Standard Tag Library that will ask the user to give a temperature in Celsius and then it will convert in Fahrenheit temperature. The code is very simple and easy to understand.
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Sample Program Output
Program Listing
celsius.jsp
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<html>
<head>
<title> Celsius To Fahrenheit Converter in JSTL</title>
</head>
<style>
body
{
font-family:arial;
font-weight:bold;
size:12px;
color:blue;
}
</style>
<body>
<h2> Celsius To Fahrenheit Converter in JSTL</h2>
<br>
<form method="post">
Give temperature in Celsius
<input type="text" name="cel" size="3" value="<c:out value="${param.cel}"/>" autofocus/><br>
<br> <br>
<input type="submit" value="Find Celsius" title="Click here to findout the temperature in fahrenheit." />
<br />
</form>
<c:if test="${pageContext.request.method=='POST'}">
<c:set var="convert" scope="session"
value="${ (9/5) * param.cel + 32}"/>
<br>
The Temperatue in Fahrenheit is <fmt:formatNumber value="${convert}" maxFractionDigits="2"/> °F.
</c:if>
</body>
</html>
