validation.java

Servlet for user authenticatiom using session

/*Assign NO:3   
  Roll No  :J 20
  Prob Statmt:Write a Servlet program for user authentication using sessions
*/
import java.io.*;
import javax.servlet.*;
import java.util.*;
import javax.servlet.http.*;

public class Validation extends HttpServlet
{	public void doGet(HttpServletRequest req,HttpServletResponse res)
		 throws ServletException,IOException
	{
        	String UserName = req.getParameter("name1");
		String PassWord = req.getParameter("password1");
		String oldUser,oldPassword;
		res.setContentType("text/html");
		PrintWriter out = res.getWriter();
		HttpSession MySession = req.getSession(true);
		String User = (String) MySession.getAttribute(UserName); 
		if(User == null)
		{
			MySession.setAttribute(UserName,PassWord);
			out.println("welcome=> ");
			out.println(UserName );
			out.println(" Your Session ID=>" );
		        out.println(MySession.getId());
		        out.println("<br>creation time");
		        out.println(new Date(MySession.getCreationTime()));
		        out.println("<br>last acess time=>");
		        out.println(new Date(MySession.getLastAccessedTime()));
		        out.println("<br> getv maximum inactive interval=>");
		        out.println(MySession.getMaxInactiveInterval());
		}
		else
		{	oldUser = (String)MySession.getAttribute(UserName);
			if(oldUser.equals(UserName))
			{
				out.println("Already Logged in");
			}
                        else
                        {
                          MySession.setAttribute(UserName,PassWord);
			  out.println("welcome to ur account");
		           out.println(MySession.getId());
		           out.println("<br>creation time=>");
		           out.println(new Date(MySession.getCreationTime()));
		           out.println("<br>last acess time=>");
		           out.println(new Date(MySession.getLastAccessedTime()));
		           out.println("<br> getv maximum inactive interval=>");
		           out.println(MySession.getMaxInactiveInterval());
                        }
		}
	}
}