For resources that make good candidates for caching, like images and CSS files, it's worth looking at using a servlet that overrides getLastModified. Obligatory JSTL plug:
<%@ page contentType="text/css" %> <%@ taglib prefix="c" uri="http://java.sun.com/jstl/core"; %> .cssMainBody { background-color : <c:out value="${styleData.backgroundColor}"/>; color : <c:out value="${styleData.textColor}"/>; font-family : <c:out value="${styleData.fontFamily}"/>; font-size : <c:out value="${styleData.fontSize}"/>; font-weight : <c:out value="${styleData.fontWeight}"/>; } Even better with JSP2.0: <%@ page contentType="text/css" %> .cssMainBody { background-color : ${styleData.backgroundColor}; color : ${styleData.textColor}; font-family : ${styleData.fontFamily}; font-size : ${styleData.fontSize}; font-weight : ${styleData.fontWeight}; } Quoting Frank Zammetti <[EMAIL PROTECTED]>: > I don't at present use any taglibs whatsoever in the app I'm doing this in, > so I don't know if there is any added complexity involved there. But as far > > as what I AM doing goes, I'm not sure what will really be helpful, so let me > > get as detailed as I can and you can ignore the superfolous parts... > > First, the application I'm doing this in allows users to set their own color > > scheme, font scheme, and some other style elements (within a defined set of > things they can possibly change). So, I have a UserScheme table with > columns like BackgroundColor, FontSize, TextColor, etc. > > So, in each JSP I have the line: > > <link rel="StyleSheet" href="/app/styles.act" type="text/css"> > > This is mapped to an Action called StylesAction. All it does is reads in > all the columns from the above table for the current user. I then dump all > those values into a HashMap (I simply key it off the column name in the > table). > > Next, in the styles.jsp, I do things like this: > > <% HashMap styleData = (HashMap)request.get("styleData"); %> > .cssMainBody { > background-color : <%=(String)styleData.get("backgroundColor")%>; > color : <%=(String)styleData.get("textColor")%>; > font-family : <%=(String)styleData.get("fontFamily")%>; > font-size : <%=(String)styleData.get("fontSize")%>; > font-weight : <%=(String)styleData.get("fontWeight")%>; > } > > ...and so on. Then, I just use those style classes in my other JSP's like > I would any other style tag (I always do className="xxx" where xxx is the > classname like cssMainBody above). > > That's all there is to it. Without knowing more about the taglibs your > using I can't really say if this will work as-is or not, but it certainly > works were taglibs are not involved. Hope that helps! > > Frank > > >From: "Voinea, Marina" <[EMAIL PROTECTED]> > >Reply-To: "Struts Users Mailing List" <[EMAIL PROTECTED]> > >To: "Struts Users Mailing List" <[EMAIL PROTECTED]> > >Subject: RE: How to use dynamically generated CSS style with Struts tags > >Date: Wed, 23 Jun 2004 10:06:32 -0400 > > > > > >Thank you very much for your answer, Frank,This is the second time you come > > >to my help! > > > >I don't want to seem lazy, but could you please give an example from the > >code... > >(the style sheet jsp and an example of a tag , for ex: html:text or > >anything else which is using the info from the syle sheet : do you use JSTL > > >or Struts tags are enough? > > ( > >(I am curious how you pass info from the jsp stylesheet to the style and > >styleCLass attibutes of the STruts html tag.... > > > > I am just starting this, so I am sure I'll benefit from your proven > >experience...(instead of fighting my mistakes for a couple of days) > > > > > > ALso, regarding performance: do you think there is a significant > >performance hit to generate the styles inline in the tags (there are some > >concerns here...), as opposed to using a style sheet file > >(generated/refreshed from time to time and maybe cashed in the browser...). > > >The tags are dynamically generated anyway, so I'm thinking additional style > > >at run time may not be that bad, what do you think? Did you do any > >comparisons/benchmarks? > > > > > >Thank you very much, > >Marina > > > >-----Original Message----- > >From: Frank Zammetti [mailto:[EMAIL PROTECTED] > >Sent: Tuesday, June 22, 2004 1:53 PM > >To: [EMAIL PROTECTED] > >Subject: Re: How to use dynamically generated CSS style with Struts tags > > > > > >I had to do something almost identical... My solution was to make my CSS > >file a JSP, and when I referenced that stylesheet in all the other JSP's, I > >did: > > > > > >where styles.act is actually an ActionMapping. I then had my StylesAction > >class, just like any other Action, that got some info out of the database > >and passed it along to the JSP, then I just used all the normal JSP/taglib > >functionality to dynamically build the CSS content. > > > >Frank > > > > >From: Bill Siggelkow <[EMAIL PROTECTED]> > > >Reply-To: "Struts Users Mailing List" <[EMAIL PROTECTED]> > > >To: [EMAIL PROTECTED] > > >Subject: Re: How to use dynamically generated CSS style with Struts tags > > >Date: Tue, 22 Jun 2004 13:28:47 -0400 > > > > > >Sounds like a custom JSP tag would work pretty well here ... > > > > > >Voinea, Marina wrote: > > > > > >> > > >>Hi everybody, > > >>Can you please help with the following question: > > >> > > >> What are the possible ways (and best) to modify the style sheet at > >run > > >>time using Struts framework? > > >> Our application is using Struts tags which refer to a static style > > >>sheet elements as presented below: > > >> > > >> <html-el:link styleClass="<%=style%>" .... > > >> > > >> We need at run time to extract user settings from DB (fonts, colors) > >and > > >>generate a style sheet accordingly . > > >> We could generate the style sheet text file for the user and store it > > >>somewhere on the disk and then refer to it, but then we may have too > >many > > >>files (for all active users). There must be a more dynamic and elegant > > >>soultion... > > >> Can we use the Struts html:link and pass a String to the "style" > > >>attribute of the html:link of the tag ? (It would be good for this > >string > > >>to be extracted from a bean prepared by an action....). > > >> > > >> Any example of XSL taglib and Struts tag integration ? This is a > >very > > >>important element for trully dynamic pages ... Any good experience that > >we > > >>can learn from? > > >> > > >> > > >> Thank you very much, > > >> Marina -- Kris Schneider <mailto:[EMAIL PROTECTED]> D.O.Tech <http://www.dotech.com/> --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
