____________
package com;
import java.io.*;
import java.util.*;
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
 
public class SearchServlet extends HttpServlet
{
 
 private ServletConfig config;
 
  public void init(ServletConfig config)
    throws ServletException{
     this.config=config;
     }
  public void service(HttpServletRequest request, HttpServletResponse response) 
              throws ServletException,IOException{
 
    HttpSession ses=request.getSession();
     PrintWriter out = response.getWriter();
    String connectionURL = "jdbc:mysql://localhost/test";
    Connection connection=null;
    ResultSet rs;
    String mobileno=request.getParameter("mobileno");
    String password=request.getParameter("password");
    response.setContentType("text/html");
 
 
    try {
       // Load the database driver
      Class.forName("com.mysql.jdbc.Driver");
      // Get a Connection to the database
      connection = DriverManager.getConnection(connectionURL, "root", "DBpassword"); 
      //Add the data into the database
      String sql = "select mobileno,password from newuser";
      Statement s = connection.createStatement();
      s.executeQuery (sql);
      rs = s.getResultSet();
      while (rs.next ()){
        mobileno=rs.getString("mobileno");
        password=rs.getString("password");
      }
      rs.close ();
      s.close ();
      }catch(Exception e)
       {
      System.out.println("Exception is ;"+e);
      }
 
     if(mobileno.equals(request.getParameter("mobileno")) 
          && password.equals(request.getParameter("password"))){
        request.setAttribute("MOBILENO",mobileno);
        request.setAttribute("PASSWORD",password);
        mobileno = (String)ses.getAttribute("MOBILENO");
        out.print("<h1>You are Already Registerd </h1>");
  }
 
             else 
             {
 
          //    out.println("<h1>You are not a Valid User Please Register</h1>");
 
          //       response.sendRedirect("/ServletProject/ValidUser");
 
 
        request.setAttribute("MOBILENO",mobileno);
        request.setAttribute("PASSWORD",password);
         response.sendRedirect("LoginServlet");
 
           //out.println("<a href='newregister.jsp'><br>Register Here!!</a>");
         }
   } 
 
  }
 
 2nd servlet...
___________
 
package com;
import java.io.*;
import java.util.*;
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
 
public class LoginServlet extends HttpServlet{
 
  private ServletConfig config;
 
  public void init(ServletConfig config)
    throws ServletException{
     this.config=config;
     }
  public void doGet(HttpServletRequest request, HttpServletResponse response) 
              throws ServletException,IOException{
 
    PrintWriter out = response.getWriter();
    String connectionURL = "jdbc:mysql://localhost/test";
    Connection connection=null;
 
      HttpSession ses=request.getSession();
 
    String mobileno = (string)ses.getAttribute(mobileno); 
     String password = ses.getAttribute(password); 
 
    response.setContentType("text/html");
    try {
       // Load the database driver
      Class.forName("com.mysql.jdbc.Driver");
      // Get a Connection to the database
      connection = DriverManager.getConnection(connectionURL, "root", "DBpassword"); 
      //Add the data into the database
      String sql = "insert into  newuser values(" + mobileno  + ",'" + password  + "')";
      Statement s = connection.createStatement();
 
          int x = s.executeUpdate(sql);
        if(x==1)
        {
                out.println("<h1> Thanks For the Registration</h1>"); 
        out.println("<br><h1> Welcome to 4s Technologies</h1></br>"); 
        }
        else{
        out.println("<h1>+Your Registration is failed..Plase try again+</h1>");  
        out.println("<a href='newregister.jsp'><br>Register Here!!</a>");     
         } 
     s.close();
 
      }
      catch(Exception e)
    {
      System.out.println("Exception is ;"+e);
      }
    }  
}