JAva webフィルタ

package Filter;

import javax.servlet.*;
import java.io.IOException;

public class LoginFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        String name  = request.getParameter("name");
        if (name == null){
            System.out.println("     ");
            response.getWriter().write("     ");
            return;
        }else {
            chain.doFilter(request,response);
        }

    }

    @Override
    public void destroy() {

    }
}

web.xml


   loginFilter
   Filter.LoginFilter


   loginFilter
   /login/in