jsp中如何清除緩存（轉）

<%
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、清除頁面緩存

 在jsp頁里 
           
            
             
              
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                   <%response.setHeader( 
                   "Pragma" 
                   , 
                   "No-cache" 
                   );  
                   
                   
                   response.setHeader( 
                   "Cache-Control" 
                   , 
                   "no-cache" 
                   );  
                   
                   
                   response.setDateHeader( 
                   "Expires" 
                   ,  
                   0 
                   );  
                   
                   
                   response.flushBuffer();%> 
                   
                   
                
               
              
             
            
           在html頁里： 
           
            
             
              
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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();  
                   
                   
                   %> 
                   
                   
                
               
              
             
            
           在頁面關閉時清除session，需要捕獲windows.onclose事件，再調用清除session方法 補充：如何使用 JavaScript 代碼清除緩存？ 如果在服務器級不能生成隨機數，您可以使用 JavaScript 代碼在客戶端（瀏覽器）級生成一個字符串。以下示例圖解說明如何使用標准圖像代碼或 Iframe/JavaScript 代碼執行緩存清除。 這些僅為示例。如果要使用該代碼，請為特定 HTML 代碼對示例作相應調整。您必須將實際代碼粘貼到這些示例中的相應位置。 標准圖像代碼示例： 
           
            
             
              
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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 代碼示例： 
           
            
             
              
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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>