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="https://ad.doubleclick.net/jump/N409.somesite/B470;sz=468x60;ord='+ num +'?"><IMG SRC="https://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="https://ad.doubleclick.net/jump/N409.somesite/B470;sz=468x60;ord=[timestamp]?">
<IMG SRC="https://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="https://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="https://ad.doubleclick.net/adj/N409.somesite/B470;abr=!ie;sz=468x60;ord='+ num +'?"></SCR'+'IPT></IFRAME>');
// end hide from browsers ==>
</script>
<noscript>
<A HREF="https://ad.doubleclick.net/jump/N409.somesite/B470;abr=!ie4;abr=!ie5;sz=468x60;ord=?">
<IMG SRC="https://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。
|