package college.servlet;

import java.io.IOException;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class HelloServlet
 */
@WebServlet("/HelloServlet")
public class HelloServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

    /**
     * Default constructor. 
     */
    public HelloServlet() {
        super();
    	// TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub7
		
		String url = "/hello-world.jsp";
		
		String username = request.getParameter("user");
		if ((username==null) || (username.length()==0)) {
			url = "/user-login.jsp";
			request.setAttribute("error", "User must not be empty");			
		}
		
		ServletContext context = this.getServletContext();
		RequestDispatcher dispatcher = context.getRequestDispatcher(url);
		dispatcher.forward(request, response);
	}
		

}