public class AuthenticationFilter extends UsernamePasswordAuthenticationFilter{

	@Autowired
	private UserService userService;

public AuthenticationFilter() 
{
        setFilterProcessesUrl("/login");
        setUsernameParameter("login");
        setPasswordParameter("password");
}

    public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws IOException, ServletException 
    {
		HttpServletRequest request = (HttpServletRequest) req;
		if ("POST".equals(request.getMethod())) 
		{
			super.doFilter(req, resp, chain);
		}
		else 
		{
			chain.doFilter(req, resp);
                        
		}
    }


    @Override
    public Authentication attemptAuthentication(HttpServletRequest request, HttpServletResponse response) throws AuthenticationException 
    {
    	String userName = obtainUsername(request);
    	if(StringUtils.isEmpty(userName))
    		throw new UsernameNotFoundException("username is not provided");
    	User user = userService.getByLogin(userName);
    	if(user == null)
    		throw new UsernameNotFoundException("username is not found");

    	return super.attemptAuthentication(request, response);
    }
}