标签:keyword class index invalid 在服务器 caching 使用 lang 缓存
一、清除页面缓存
在jsp页里
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<%response.setHeader( "Pragma" , "No-cache" ); response.setHeader( "Cache-Control" , "no-cache" ); response.setDateHeader( "Expires" , 0 ); response.flushBuffer();%> |
在html页里:
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< 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
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<% Cookie killMyCookie = new Cookie( "mycookie" , null ); killMyCookie.setMaxAge( 0 ); killMyCookie.setPath( "/" ); response.addCookie(killMyCookie); %> |
三、清除session
清除session方法
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<%@ 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:
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<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> <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:
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<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> <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> |
标签:keyword class index invalid 在服务器 caching 使用 lang 缓存
原文地址:https://www.cnblogs.com/xihong2014/p/9654936.html