jsp中如何清除缓存（转）

<%
response.setHeader("Cache-Control","no-cache"); //HTTP 1.1
response.setHeader("Pragma","no-cache"); //HTTP 1.0
response.setDateHeader ("Expires", 0); //prevents caching at the proxy server
%>

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> 
           
           
           <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： 
   
    
     
      
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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> 
           
           
           <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>