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automatic refresh of a jsp page

Posted on 2002-06-03
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Last Modified: 2009-12-16
hi all,
I have a problem regarding refreshing a jsp page. The first time I call the jsp file, the data from the database is displayed correctly. But when I update the DB, and call the jsp page, the data displayed in the browser is not updated. I still have to press "ctrl-r" to update the display. How would I update the display in the browser without using "ctrl-r"?

thanks.
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Question by:eaglesview
4 Comments
 
LVL 4

Accepted Solution

by:
pellep earned 200 total points
ID: 7050899
put these HTML statements on top of your page (ie inside the <head> section)

<HEAD>
<META HTTP-EQUIV="expires" CONTENT="Wed, 26 Feb 1997 08:21:57 GMT">
<META HTTP-EQUIV="Pragma" CONTENT="no-cache">
<META HTTP-EQUIV="cache-control" CONTENT="no-cache">
</HEAD>
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LVL 19

Expert Comment

by:cheekycj
ID: 7051220
Actually, the best thing that works in IE and Netscape is to have the following:
<%
response.addHeader("Pragma" , "No-cache") ;
response.addHeader("Cache-Control, "no-cache") ;
response.addDateHeader("Expires", 0);  
%>

BOTH in the head of the of page and bottom of the page (I read this in a message board and it seems
to work for me)

<html>
<head>
<%
// this prevents caching in NS and IE
response.addHeader("Pragma" , "No-cache") ;
response.addHeader("Cache-Control, "no-cache") ;
response.addDateHeader("Expires", 0);  
%>
<!-- this will refresh the page every 5 seconds -->
<META HTTP-EQUIV=Refresh CONTENT="5; URL=currentJSP.jsp"/>
</head>
<body>

....

</body>
<%
// this helps prevent caching in IE
response.addHeader("Pragma" , "No-cache") ;
response.addHeader("Cache-Control, "no-cache") ;
response.addDateHeader("Expires", 0);  
%>
</html>

Also what you can do is add a random number at the end of the URL when you do the meta refresh.

HTH,
CJ
0
 
LVL 1

Expert Comment

by:raid999
ID: 7052255
you can also set a timer in the JSP page and then use response.redirect(URL);
0
 

Author Comment

by:eaglesview
ID: 7052674
thanks.. it solved my problem.
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