瀏覽器為了加速使用者的瀏覽速度，常會將瀏覽過的網頁快取到硬碟，下次瀏覽同一頁時，便去硬碟裡面去找，但現在的網頁常是動態，為了避免使用者抓到硬碟內到期的資料，JSP可用下面的方式來防止瀏覽器快取住網頁，此方法便可保證使用者到這個網頁時始終都可看到最新的資料。
1.JSP文法
<%
response.setHeader("Pragma","no-cache");
response.setHeader("Cache-Control","no-cache");
response.setDateHeader("Expires", 0);
%>
2.也可以用以下的HTML文法，可用在靜態網頁上
<meta http-equiv="Pragma" content="no-cache">
<meta http-equiv="Cache-Control" content="no-cache">
<meta http-equiv="Expires" content="0">
注意，這些HTML文法要下在<head></head>的標籤內。
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