login through jsp and servlet.

<!DOCTYPE html>
<html>

  <meta charset="UTF-8">

   <title>Login</title>

     <link rel="stylesheet" href="newcss.css" media="screen" type="text/css" />


<head>

 <meta charset="utf-8">

 <title>Login</title>

     
        <script type="text/javascript">
            function check()
            {
                var a=document.getElementById("name").value;
                var b=document.getElementById("pass").value;
                if(a=="")
                {
                alert("Enter your username!!");
                return false;
                }
                else if(a.length<5)
                {
                    alert("Pls fill correct username!!");
                }
                if(b=="")
                {
                  alert("Enter your password!!");  
                  return false;
                }
                return true;
            }
            </script>


 </head>

 <body>
<center> <h1>Inventory Management System</h1></center>
<center><div><img src="images.jpg"/></div></center>
    <div id="login">

         <form action="Loginact" method="post" onsubmit="return check();">

             <fieldset class="clearfix">

                 <p><input type="text"  id="name" name="name" placeholder="username"></p> <!-- JS because of IE support; better: placeholder="Username" -->
                <p><input type="password"   id="pass" name="pass" placeholder="password"></p> <!-- JS because of IE support; better: placeholder="Password" -->
                <p><input type="submit" value="Sign In" ></p>

             </fieldset>

         </form>

         <p>Not a member? <a href="#">Sign up now</a><span class="fontawesome-arrow-right"></span></p>

     </div> <!-- end login -->
    
</body>
</html>




Loginact.java

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

 package Connect;

 import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.swing.JOptionPane;

 /**
 *
 * @author NAVJYOTI
 */
public class Loginact extends HttpServlet {

     /**
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
     * methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
       try
       {
           PrintWriter out=response.getWriter();
           
         databse d=new databse();
         Connection con=d.connectit();
         String sql="select * from register where name='"+request.getParameter("name")+"' and password='"+request.getParameter("pass")+"'";
         PreparedStatement pst=con.prepareStatement(sql);
         out.print(pst);
         ResultSet rs=pst.executeQuery();
          int count = 0;
               while(rs.next())
               {
                   count = count + 1;
               }
           if(count == 1)
           {
             out.print("<script type='text/javascript'>alert('access granted!!');</script>");
             //out.print(request.getParameter("name"));
             RequestDispatcher rd=request.getRequestDispatcher("index.html");
                 rd.forward(request, response);
           }
           else if(count > 1){
                out.print("<script type='text/javascript'>alert('Duplicate User!!');</script>");
                //out.print(request.getParameter("pass"));
                 RequestDispatcher rd=request.getRequestDispatcher("login");
                 rd.forward(request, response);
           }
           else{
                out.print("<script type='text/javascript'>alert('User not Found!!');</script>");
                 response.sendRedirect("login");
           }

          
       }
       catch(Exception e)
       {
           System.out.println(e);
       }
    }

     // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

     /**
     * Handles the HTTP <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

     /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

 }







after sucess of login







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