Dr R Anurekha: Form data and Servlets

Simple program to demonstrate accessing form data in servlets. Factorial of a number

// Form to submit number to server

<html>

<head>

<title>HTML Forms and Servlets</title>

<style>

label

{

font-family:vivaldi;

font-size:x-large;

letter-spacing:2px;

line-height:40px;

}

</style>

</head>

<body>

<h2>HTML and Servlets</h2></br>

<label>Enter Number </label>

</br> </br>

<button class="btn" type="button " >Calculate!!! </button>

</center>

</form>

</body>

</html>

// Servlet to access form data and generate response to client browser

import javax.servlet.http.*;

import javax.servlet.*;

import java.io.*;

import java.util.*;

public class Fact extends HttpServlet

{

public void doGet(HttpServletRequest req,HttpServletResponse res)

throws ServletException, IOException

{

//setting the content type

res.setContentType("text/html");

//create the stream to write the data

PrintWriter pw=res.getWriter();

int N = Integer.parseInt(req.getParameter("Num"));

int f = 1;

//writing html in the stream

pw.println("<html><body>");

for(int i=1;i<=N;i++)

f = f*i;

pw.println("<H2>Factorial of "+N+" is "+ f +"</H2>");

pw.println("</body></html>");

//closing the stream

pw.close();

}

Dr R Anurekha

Form data and Servlets - Factorial of a number

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