Dang, Kishore, you are relentless! I like that!
You have the option of setting each tag with the value you want for
these and programming them in, if you like.
<snip>
On Sat, 29 Jan 2005 14:40:26 -0600, Kishore Senji <[EMAIL PROTECTED]> wrote:
> > response.setContentType(type);
> > response.setHeader("Cache-Control", "");
> > response.setHeader("Pragma", "");
> > response.setHeader("Expires", "");
> > response.addHeader("Content-Disposition","filename=" + name);
>
> With the above headers, is caching turned on or off. Cache-Control is
> set to empty string. If the browsers intrepret this as "no-cache" then
> fetching the same image, js or a css file (through the resource
> action) over and again might a performance drawback as apposed to
> getting those files only once (which is what I guess most browsers do,
> cache the images, js, css with static links to resources). Isn't it?
</snip>
Here is something you could do, for example.
public final class ResourceAction
extends Action {
public ActionForward execute(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response)
throws IOException,
ServletException {
String file = request.getParameter("file");
String ext = file.substring(file.lastIndexOf('.') + 1);
String type = null;
String path = null;
if ("gif".equals(ext)) {
type = "image/gif";
path = path("gif");
} else if ("jpg".equals(ext)) {
type = "image/jpeg";
path = path("jpeg");
} else if ("css".equals(ext)) {
type = "text/css";
path = path("css");
} else if ("flash".equals(ext)) {
type = "application/x-shockwave-flash";
path = path("flash");
} else if ("text".equals(ext)) {
type = "text/plain";
path = path("text");
} else if ("js".equals(ext)) {
type = "text/javascript";
path = path("js");
} else if ("png".equals(ext)) {
type = "image/png";
path = path("png");
} else if ("html".equals(ext)) {
type = "text/html";
path = path("html");
} else if ("applet".equals(ext)) {
type = "application/x-java-applet";
path = applet();
}
String fileName = "filename=" + Classpath.WEB_INF + path + file;
response.setContentType(type);
/* E.g. cache = "post-check=120,pre-check=240",
= "max-age=86400,private"
post-checks are the time after the initial cache at which you
have an immediate view without any update. The time from the
post to the pre-check is the time whem you get an immediate
view but an update. The time after the pre-check time is when
you get an update prior to a view.
Cf.
http://msdn.microsoft.com/workshop/author/perf/perftips.asp#Use_Cache-Control_Extensions
*/
String cache = request.getParameter("cache"); /* HTTP 1.1:
Numbers are seconds for cache. */
String pragma = request.getParameter("pragma"); /* HTTP 1.0:
Numbers are seconds for pragma. */
String expires = request.getParameter("expires");/* HTTP 1.0:
Numbers are minutes for expires. */
response.setHeader("Cache-Control", ((cache == null) ?
"no-check" : cache));
response.setHeader("Pragma", ((pragma == null) ?
"no-check" : pragma));
response.setHeader("Expires", ((expires == null) ?
"1440" : expires));
response.addHeader("Content-Disposition",(fileName));
try {
FileInputStream fis = new FileInputStream(fileName);
BufferedInputStream bis = new BufferedInputStream(fis);
byte[] bytes = new byte[bis.available()];
OutputStream os = response.getOutputStream();
bis.read(bytes);
os.write(bytes);
os.flush();
os.close();
} catch (IOException ioe) {
StdOut.log(SiteConstant.ERROR_LOG,"ResourceAction: problem file
is: " + fileName + "\n" + StackTrace.trace(ioe) + "\n" +
ioe.getMessage());
}
return null;
}
private String path(String fileType) {
return "resource" + File.separator + "content_type" +
File.separator + fileType + File.separator;
}
private String applet() {
return "classes" + File.separator + "com" + File.separator +
"crackwillow" + File.separator + "applet";
}
} ///;-)
Jack
--
"You can lead a horse to water but you cannot make it float on its back."
~Dakota Jack~
"You can't wake a person who is pretending to be asleep."
~Native Proverb~
"Each man is good in His sight. It is not necessary for eagles to be
crows. We are poor . . . but we are free."
~Hunkesni (Sitting Bull), Hunkpapa Sioux~
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