EjercitarWeb/src/control/LogInFilter.java


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package control;

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
 
/**
 * @author Samu
 */
public class LogInFilter implements Filter {
 
    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        //Obtenemos un HttpServletRequest con un casting
        HttpServletRequest requestMod = ((HttpServletRequest) request);
        if (isPermited(requestMod) == false){
            requestMod.getSession().setAttribute("requestedPage", requestMod.getRequestURL().toString());
            RequestDispatcher rd = request.getRequestDispatcher("/login.jsp");
            rd.forward(request, response);
        }else{
            //Continua la secuencia de ejecución normal
            chain.doFilter(request, response);
        }
    }
 
    private boolean isPermited(HttpServletRequest request) {
        if (request.getSession().getAttribute("usuario") == null) {
            return false;
        } else{
            return true;
        }
    }
 
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }
 
    @Override
    public void destroy() {
    }
}