Login form in servlet with Attribute & RequestDispatcher

login.html

<html>
  <head>
    <title></title>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        
  </head>
  <body>
   <form method="post" action="login">
        User Name:<input type="text" name="name" /><br/>
        Password:<input type="password" name="pass" /><br/>
        <input type="submit" value="login" />
        </form>
  </body>
</html>

login.java

package Code;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *
 * @author Dilip
 */
public class login extends HttpServlet {

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {

        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        try {
           String name = request.getParameter("name");
        String pass = request.getParameter("pass");
        request.setAttribute("user",name );
        if(Validate1.checkUser(name, pass))
        {
            RequestDispatcher rs = request.getRequestDispatcher("Welcome1");
            rs.forward(request, response);
        }
        else
        {
           out.println("Username or Password incorrect");
           RequestDispatcher rs = request.getRequestDispatcher("login.html");
           rs.include(request, response);
        }
        } finally { 
            out.close();
        }
    } 
}

Welcome1.java

package Code;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
 *
 * @author Dilip
 */
public class Welcome1 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");
        PrintWriter out = response.getWriter();
        String n=(String)request.getAttribute("user");
        try {
           
        out.println("Welcome user:"+n);
        } finally { 
            out.close();
        }
    } 
}

Validate1.java

package Code;
import java.sql.*;
/**
 *
 * @author Dilip
 */
public class Validate1 {
public static boolean checkUser(String uname,String pass)
     {
      boolean st =false;
      try{
                
         Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
          Connection con=DriverManager.getConnection("jdbc:odbc:mydb","sa","niitbpl123");
         PreparedStatement ps =con.prepareStatement("select * from student where name=? and pass=?");
         ps.setString(1, uname);
         ps.setString(2, pass);
         ResultSet rs =ps.executeQuery();
         st = rs.next();

      }catch(Exception e)
      {
          e.printStackTrace();
      }
         return st;
}

}

Output

If user is and password are correct then output will be

If user is and password are incorrect then output will be