网上图书商城11--后台登录过滤器

1.web.xml

AdminLoginFiltercn.itcast.goods.admin.web.filter.AdminLoginFilterAdminLoginFilter/adminjsps/admin/*/admin/*

2.AdminLoginFilter

public void doFilter(ServletRequest request, ServletResponse response,
		FilterChain chain) throws IOException, ServletException {
	HttpServletRequest req = (HttpServletRequest) request;
	Object admin = req.getSession().getAttribute("admin");
	if(admin == null) {
		request.setAttribute("msg", "您还没有登录，不要瞎遛达！");
		request.getRequestDispatcher("/adminjsps/login.jsp").forward(request, response);
	} else {
		chain.doFilter(request, response);
	}
}