不允许浏览器端或缓存服务器缓存当前页面信息

response.setHeader( "Pragma", "no-cache" );  
response.setDateHeader("Expires", 0);  

response.setHeader( "Cache-Control", "no-cache" );  
response.setHeader( "Cache-Control", "no-store" ); //该设置是防止Firefox 缓存 
response.setHeader( "Cache-Control", "must-revalidate" )