我的代码是这样的:
<%
response.setHeader("Cache-Control", "no-cache");
response.setHeader("Cache-Control", "no-store");
response.setDateHeader("Expires", 0);
response.setHeader("Pragma", "no-cache");
%>
${Sess_Var}
<c:if test="${empty Sess_Var}" >
<%
response.sendRedirect("doLogin.obj");
%>
它不起作用,因为单击后退按钮会显示上一页.. 我该怎么办?