RE: jCharts in Struts

Given your analysis it makes no sense whatsoever for you to use
servlets. In my case we have one or two people looking at realtime
graphs so the servlet might have been ideal. The problem is it needs to
be embedded in the page with other HTML items. Anybody know if the
servlet output be the target of an image tag? If not we will have to
save the realtime image to a file and create a dynamic reference to it.
That leaves the problem of writing file resources from a bundled up WAR
or EAR file. 


-----Original Message-----
From: Chris Ward [mailto:[email protected]] 
Sent: Friday, November 05, 2004 1:11 PM
To: [email protected]
Subject: Re: [jCharts-users] jCharts in Struts


On Friday 05 November 2004 04:09 am, Chris McKay wrote:
> Plus you need to write a file collector as well to tidy up the cache 
> directory ...
>
> C

In my case, I don't need to delete a 'cache' folder, as it never grows
beyond 
a set size of images. The image names are reused each time the graphs
are 
created, so that static names can be used on web pages.

It may not be the case for most people, but I have to generate my data
from a 
database for each chart, and I have from 2 to 8 charts on a page, with
my 
final result being a PDF of 30-40 pages. In my case, I think the cost of

generating the graphs is high, with the individual graphs changing 
infrequently.

I have used the servlet in an img tag before, and it appears that most
people 
here like that method and recomend it first, but I have always liked the
idea 
of reducing server load to the web server. If you have highly dynamic
graphs, 
I guess you have no choice. I have also contemplated moveing the servlet

graph generators to a seperate 'image' server, but decided that still
would 
be best with more dynamic charts than I have. Mine only change when a
user 
changes input data, not with an automatic process such as recording 
temperature data.

All things said, if the servlet in an image tag is the preferred method
of 
this list, I don't need to confuse new people by suggesting saving to a
file 
again, but I did put thought into it before making my decision.

Chris


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