1. JSP/Servlet
<%
response.setHeader("Pargma", "No-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0);
%>
2. HTML
<head>
<meta http-equuiv="Pragma" content="no-cache">
<meta http-equuiv="Cache-Control" content=no-cache">
<meta http-equuiv="expires" content="0">
</head>