- 14. A web application for implementation: The user is first served a login page which takes user's name and password. After Submitting the details the server checks these values against the data from a database and takes the following decisions.
- • If name and password matches, serves a welcome page with user's full name.
- • If name matches and password doesn't match, then serves “password mismatch” page
- • If name is not found in the database, serves a registration page, where user’s full name is asked and on submitting the full name, it stores, the login name, password and full name in the database (hint: use session for storing the submitted login name and password)
Aim: A web application that takes name and age from an HTML page. If the age is less than 18, it should send a page with “Hello , you are not authorized to visit this site” message, where should be replaced with the entered name. Otherwise it should send “Welcome to this site” message.
File: login7.html
<form name="login" method="post" action="hello7.jsp">
<table width="370" border="1" align="center" style="background: silver;">
<tr height="25">
<th colspan="4" align="center">User Login</th>
</tr>
<tr>
<td>User Name</td>
<td><input type="text" name="uname" required></td>
</tr>
<tr>
<td>Age</td>
<td><input type="number" name="age" required></td>
</tr>
<tr align="center">
<td colspan="2">
<input type="submit" name="ok" value="Submit">
</td>
</tr>
</table>
</form>
File: hello7.jsp
<%@page import="javax.servlet.RequestDispatcher" %>
<%
String uname = request.getParameter("uname");
session.setAttribute("uname", uname);
int age = Integer.parseInt(request.getParameter("age"));
if (age < 18) {
out.println("<h4 align='center'>Hello " + uname + ", you are not authorized to visit this site.</h4>");
RequestDispatcher rd = request.getRequestDispatcher("login7.html");
rd.include(request, response);
} else {
out.println("<h2 align='center'>Hello " + uname + ", Welcome to this site!</h2>");
}
%>
Output:
