servlet过滤器与监听器

对登录过滤不能直接访问main主页面

path排除登录的情况

public class LoginFilter implements Filter{

	public void destroy() {
		// TODO Auto-generated method stub
		
	}

	public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse,
			FilterChain filterChain) throws IOException, ServletException {
		HttpServletRequest request=(HttpServletRequest)servletRequest;
		HttpSession session=request.getSession();
		Object o=session.getAttribute("currentUser");
		String path=request.getServletPath();
		if(o==null&&path.indexOf("login")