Login With Session and Database.


import java.sql.*;
import javax.servlet.http.*;
import javax.servlet.*;
import java.io.*;

public class Login extends HttpServlet
{
public void doGet(HttpServletRequest request, HttpServletResponse response)
    throws IOException, ServletException
    {
try{
        response.setContentType("text/html");  
        PrintWriter out = response.getWriter();
String n=request.getParameter("name");
String p=request.getParameter("pass");
Class.forName("oracle.jdbc.driver.OracleDriver");
                   Connection con=DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:xe","navjyoti","jyoti7");
             System.out.println(""+con);
PreparedStatement pst=con.prepareStatement("select * from employee where password=?");
pst.setString(1,p);
ResultSet rs=pst.executeQuery();
            if(rs.next())
            {
  HttpSession ses=request.getSession(true);
  ses.setAttribute("user","p");
  out.println("id:'"+ses.getId()+"'");
  out.println("id:'"+ses.getAttributeNames()+"'");
  out.println("id:'"+ses.getCreationTime()+"'");
  out.println("id:'"+ses.getLastAccessedTime()+"'");
  //out.println("'"+ses.getValue('user')+"'");
out.println("welcome:'"+n+"'");
                RequestDispatcher rd=request.getRequestDispatcher("main.html");
                rd.include(request,response);
            }
            else
            {
                out.println("invalid username&password"+n);
                RequestDispatcher rd=request.getRequestDispatcher("index.html");
                rd.include(request,response);
            }
        }
        catch(Exception e)
        {
            System.out.println(e);
        }
}
}

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