The files used to run the application are:
1. main.jsp
2. Login.jsp
3. process2.jsp
4. success.jsp
5. retry.jsp
Solution:
main.jsp
<html>
<head>
<title> </title>
</head>
<body>
<br>
<br><br>
<form action="process2.jsp” method = "post" >
<center>Account Id</center>
<input type = "text" name="acc_id>
<center>Pin Number</center>
<input type = "Pin Number" name = "pin_num">
<center><input type="submit" name="Submit" value="Login"></center>
</form>
</body>
</html>
Login.java
package Java_class;
import java.sql.*;
public class Login
{
private String account_id = "";
private String pin_number = "";
public Login()
{
}
public void setaccount_id(String acc_id)
{
this.acc_id = acc_id;
}
public void setPin_num(String pin_number)
{
this.pin_number = pin_number;
}
public boolean authenticate(String acc_id2, String pin_num2)
{
String query="select * from Registration";
String Dbacc_id="";
String DbPin_num="";
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection
con=DriverManager.getConnection("jdbc:odbc:regist
er");
Statement stat=con.createStatement();
ResultSet rst=stat.executeQuery(query);
while(rst.next())
{
Dbacc_id=rst.getString("account_id");
DbPin_num=rst.getString("pin_number");
if (acc_id2.equals(Dbacc_id) &&
pin_num2.equals(DbPin_num))
{
return true;
// break;
}
}
return false;
}
catch(Exception e)
{
e.printStackTrace();
return false;
}
}
}
process2.jsp
<%@ page import="java.util.*" %>
<jsp:useBean id="idHandler" class="Java_class.Login" scope="request">
<jsp:setProperty name="idHandler" property="*"/>
</jsp:useBean>
<%
String username = request.getParameter("account_id");
String password = request.getParameter("pin_number");
// If authenticated pass control to success.jsp
if (idHandler.authenticate(account_id, pin_number))
{
%>
<jsp:forward page="success.jsp"/>
<%
} else {
%>
<jsp:forward page="retry.jsp"/>
<%
}
%>
//success.jsp
<html>
<head>
<title> User Validation Page </title>
</head>
<body>
You have successfully logged in to our Website
</body>
</html>
retry.jsp
<html>
<head>
<title> User Validation Page </title>
</head>
<body>
Incorrect username or password!!!!
<A href="main.jsp"> Retry </A>
</body>
</html>
The output of the program is as shown in Figure 14.1.
Figure 14.1: Login FormAfter entering valid details, when the user clicks on Login button, a message is displayed to the user as shown in Figure 14.2.
Figure 14.2: Logon Success MessageIf the user enters invalid details in the login form, a message is displayed to the user informing that the details entered are invalid. The message appears as shown in Figure 14.3.
Figure 14.3: Invalid Login Message
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