HTML Form
- index.jsp (put it in the “web” folder)
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Calculator</title>
</head>
<body bgcolor="aqua">
<form method="post" action="GreetingServlet">
<h3 style="text_align:center;">Choose an operation:
<input type="radio" name="r1" value="add" />addition
<input type="radio" name="r2" value="sub" />subtraction
<input type="radio" name="r3" value="mul" />multiplication
<input type="radio" name="r4" value="div" />division
</h3>
</label>
<label>Choose 1<sup>st</sup> number:</label>
<input type="text" name="n1" />
<br>
<label>Choose 2<sup>nd</sup> number:</label>
<input type="text" name="n2" />
<br>
<label>
<input type="submit" value="Submit" style="background-color: hotpink">
</label>
</form>
</body>
</html>
- FormServlet.java (put it in the “src” folder)
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("/FormServlet")
public class GreetingServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
try
{
response.setContentType("text/html");
PrintWriter out= response.getWriter();
out.println("<body style='background-color:black;color:yellow;'>");
out.println("<h3 style='color:red;'>Output of your inputs </h3>");
int a1= Integer.parseInt(request.getParameter("n1"));
int a2= Integer.parseInt(request.getParameter("n2"));
if(request.getParameter("r1")!=null)
{
out.println("<p>Addition</p>"+(a1+a2));
}
if(request.getParameter("r2")!=null)
{
out.println("<p>Subtraction</p>"+(a1-a2));
}
if(request.getParameter("r3")!=null)
{
out.println("<p>Multiplication</p>"+(a1*a2));
}if(request.getParameter("r1")!=null)
{
out.println("<p>Division</p>"+(a1/a2));
}
}
catch(Exception e)
{
System.out.println("error" + e.getMessage());
}
}
}
Note: To run this program type: localhost:8080 in the browser URL.
Click here if you don’t don’t how to set up a NetBeans servlet project.
