SpringMVC GenericFilterBean Sınıfı

Giriş
WebSecurityConfigurerAdapter sınıfı aracılığıyla HttpSecurity nesnesine eklenir.

doFilter metodu
Örnek 
Şöyle yaparız.

@Override
public void doFilter (ServletRequest request,
                      ServletResponse response,
                      FilterChain chain)
throws IOException,
      ServletException
{
  Customer customer = (Customer)SecurityContextHolder.getContext().getAuthentication()
    .getPrincipal();
  // some more logic 

  // call next filter in the filter chain
  chain.doFilter(request, response);
}