I want this login page with multiple user, such as if the admin is logged in, i need to go to adminhome.java and if it's a user go to user.java

<form action="servlet1" method="post">  
Name:<input type="text" name="username"/><br /><br />  
Password:<input type="password" name="userpass"/><br /><br />  
<input type="submit" value="login"/>  
</form>  

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;  
  
  
public class FirstServlet extends HttpServlet {  
public void doPost(HttpServletRequest request, HttpServletResponse response)  
        throws ServletException, IOException {  
  
    response.setContentType("text/html");  
    PrintWriter out = response.getWriter();  
          
    String n=request.getParameter("username");  
    String p=request.getParameter("userpass");  
          
    if(LoginDao.validate(n, p)){  
        RequestDispatcher rd=request.getRequestDispatcher("servlet2");  
        rd.forward(request,response);  
    }  
    else{  
        out.print("Sorry username or password error");  
        RequestDispatcher rd=request.getRequestDispatcher("index.html");  
        rd.include(request,response);  
    }  
          
    out.close();  
    }  
}  
LoginDao.java
import java.sql.*;  
  
public class LoginDao {  
public static boolean validate(String name,String pass){  
boolean status=false;  
try{  
Class.forName("oracle.jdbc.driver.OracleDriver");  
Connection con=DriverManager.getConnection(  
"jdbc:oracle:thin:@localhost:1521:xe","system","oracle");  
      
PreparedStatement ps=con.prepareStatement(  
"select * from userreg where name=? and pass=?");  
ps.setString(1,name);  
ps.setString(2,pass);  
      
ResultSet rs=ps.executeQuery();  
status=rs.next();  
          
}catch(Exception e){System.out.println(e);}  
return status;  
}  
}  
WelcomeServlet.java
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;  
  
public class WelcomeServlet extends HttpServlet {  
public void doPost(HttpServletRequest request, HttpServletResponse response)  
    throws ServletException, IOException {  
  
    response.setContentType("text/html");  
    PrintWriter out = response.getWriter();  
          
    String n=request.getParameter("username");  
    out.print("Welcome "+n);  
          
    out.close();  
    }  
  
}