本文实例总结了JSP清除页面缓存常用方法。分享给大家供大家参考,具体如下:
一、清除页面缓存
在jsp页里
<%response.setHeader("Pragma","No-cache"); response.setHeader("Cache-Control","no-cache"); response.setDateHeader("Expires", 0); response.flushBuffer();%>
在html页里:
<meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <META HTTP-EQUIV="Pragma" CONTENT="no-cache"> <META HTTP-EQUIV="Cache-Control" CONTENT="no-cache"> <META HTTP-EQUIV="Expires" CONTENT="0">
二、清除cookie
<% Cookie killMyCookie = new Cookie("mycookie", null); killMyCookie.setMaxAge(0); killMyCookie.setPath("/"); response.addCookie(killMyCookie); %>
三、清除session
清除session方法
<%@ page language="java" %> <% session.invalidate(); %>
在页面关闭时清除session,需要捕获windows.onclose事件,再调用清除session方法
补充:如何使用 JavaScript 代码清除缓存?
如果在服务器级不能生成随机数,您可以使用 JavaScript 代码在客户端(浏览器)级生成一个字符串。以下示例图解说明如何使用标准图像代码或 Iframe/JavaScript 代码执行缓存清除。
这些仅为示例。如果要使用该代码,请为特定 HTML 代码对示例作相应调整。您必须将实际代码粘贴到这些示例中的相应位置。
标准图像代码示例:
<SCRIPT LANGUAGE="JavaScript"> <!== hide from non-JavaScript browsers var axel = Math.random() + ""; var num = axel * 1000000000000000000; document.writeln('<A HREF="http://ad.doubleclick.net/jump/N409.somesite/B470;sz=468x60;ord='+ num +'"><IMG SRC="http://ad.doubleclick.net/ad/N409.somesite/B470;sz=468x60;ord='+ num +'" BORDER=0 WIDTH=468 HEIGHT=60 ALT="Click Here!"> Click Here!</A>'); // end hide from browsers ==> </SCRIPT> <NOSCRIPT> <A HREF="http://ad.doubleclick.net/jump/N409.somesite/B470;sz=468x60;ord=[timestamp]"> <IMG SRC="http://ad.doubleclick.net/ad/N409.somesite/B470;sz=468x60;ord=[timestamp]" BORDER=0 WIDTH=468 HEIGHT=60 ALT="Click Here!"> Click Here!</A> </NOSCRIPT>
Iframe/JavaScript 代码示例:
<SCRIPT LANGUAGE="JavaScript"> <!== hide from non-JavaScript browsers var axel = Math.random() + ""; var num = axel * 1000000000000000000; document.writeln('<IFRAME SRC="http://ad.doubleclick.net/adi/N409.somesite/B470;sz=468x60;ord='+ num +'" WIDTH=470 HEIGHT=62 MARGINWIDTH=0 MARGINHEIGHT=0HSPACE=0 VSPACE=0 FRAMEBORDER=0 SCROLLING=no BORDERCOLOR="#000000">'); document.writeln('<SCR'+'IPT language="JavaScript1.1" SRC="http://ad.doubleclick.net/adj/N409.somesite/B470;abr=!ie;sz=468x60;ord='+ num +'"></SCR'+'IPT></IFRAME>'); // end hide from browsers ==> </script> <noscript> <A HREF="http://ad.doubleclick.net/jump/N409.somesite/B470;abr=!ie4;abr=!ie5;sz=468x60;ord="> <IMG SRC="http://ad.doubleclick.net/ad/N409.somesite/B470;abr=!ie4;abr=!ie5;sz=468x60;ord=" BORDER=0 WIDTH=468 HEIGHT=60 ALT="Click Here!"> Click Here!</A> <noscript>
希望本文所述对大家JSP程序设计有所帮助。