Паттерн Front Controller

/*
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 * and open the template in the editor.
 */
package controller;
 
import java.io.IOException;
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.servlet.http.HttpSession;
 
/**
 *
 * @author 
 */
public class FrontController extends HttpServlet {
 
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
 
        HttpSession sesion = request.getSession(true);
        Bean userBean = (Bean)sesion.getAttribute("userbean");
        
        if(userBean == null){
        
            String username = request.getParameter("Username");
            String password = request.getParameter("Password");
            userBean = new Bean(username, password);
        }
        String nexPage;
        String user = "log";
        String pass = "123";
        boolean result = false;
        
        if(user.equals(userBean.getUsername()) && pass.equals(userBean.getPassword())){
 
            nexPage = "/Welcom.jsp";           
        } else {
        
            nexPage = "/Error.jsp";
        }
       dispatch(request, response, nexPage);
    }
    
  protected void dispatch(HttpServletRequest request, HttpServletResponse response, String page) 
  throws  javax.servlet.ServletException,java.io.IOException {
    RequestDispatcher dispatcher = getServletContext().getRequestDispatcher(page);
    dispatcher.forward(request, response);
  }
}

/*
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 */
package controller;
 
/**
 *
 * @author 
 */
public class Bean {
    
    private String username;
    private String password;
    
    public Bean(){
    
    }
    
    public Bean(String username, String password){
    
        this.username = username;
        this.password = password;
        
    }
    
    public String getUsername(){
    
        return username;
    }
    
    public void setUsername(String username){
    
        this.username = username;
    }
    
    public String getPassword(){
    
        return password;
    }
    
    public void setPassword(String password){
    
        this.password = password;
    }
    
}