禁止浏览器缓存

html

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> -->    < meta  http-equiv ="pragma"  content ="no-cache" >
   < meta  http-equiv ="cache-control"  content ="no-cache" >
   < meta  http-equiv ="expires"  content ="0" >

servlet

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> -->           response.setHeader( " pragma " , " no-cache " );
          response.setHeader( " cache-control " , " no-cache " );
          response.setDateHeader( " expires " ,  0 );