Basically, i use velocity only for email templates and sometimes to generate other kind of templates from one template where the use of XSLT is not appropriate. For web templates, that have more complex requirements, i prefer to use taglibs. besides el makes life as easy as we may talk in velocity. In velocity, to comprehend taglibs, you may have have to write lots of velocimacro.
you may ask for another opinion on velocity-user list as well. >-----Original Message----- >From: Larry Meadors [mailto:[EMAIL PROTECTED] >Sent: Friday, 27 February 2004 21:26 >To: [EMAIL PROTECTED] >Subject: Re: [OT] JSP or Velocity > > >>>> [EMAIL PROTECTED] 02/27/04 5:44 AM >>> >> I am starting to develop an application using struts and have been >> looking round the rest of the Jakarta project and came across the >> Velocity project. >> >> I was interested to see which which people recommended for a relative >> newbie > >After looking at velocity, I am certainly of the opinion that it adds no >value over >jsp2/jstl. It offers absolutely nothing that the jsp2/jstl combination >does not. >The only difference is that velocity is a bit more terse (if/else/end >instead of ><c:choose>/<c:when>/<c:otherwise>) and that it uses # instead of the <>. > >It is important to note that I am talking about jsp2 and tomcat 5, not >the jsp1 in >tomcat 4. > >A while back I looked in detail at the jsp/velocity comparison on the >velocity site. > >There are several issues with the comparison. The person writing the >case study >was cleary biased towards velocity and had never even considered JSTL >(which >in all fairness may not have been available at that time). Looking at >the code >(both the velocity and jstl versions are below) I think that velocity >clearly had >an influence on the jsp2/jstl constructs. > >The first thing I noticed was that the two pages do not do the same >thing. >The jsp turns off the session (the vm does not). The jsp stores >variables that >are never used which were factored out in the vm version. The vm version > >is missing required code (for example, the repCode and urlEvent >variables >are never defined). > >The jsp page is also *very* poorly written using scriptlets. You should >rarely need >to use scriptlets in jsp1/jstl pages, and I suspect with jsp2/jstl, you >will not ever >*need* to. > >With struts, you do not need to use <jsp:useBean> tags either because >the controller >does that for you. > >The jsp2/jstl version is a bit more verbose because it is based on xml >so you >cannot have things like if/else/end because they are unbalanced, but >other than >that, there are no significant differences. > >After converting the page to use JSTL and eliminating ALL of the <% %> >stuff, we >get something more like this: > >=== >The JSP version: >=== ><table width="600" border="0" cellspacing="0" cellpadding="4" > bgcolor="white"> > <tr> > <td> > <i><b>Topic: ${meeting.topic}</b></i> > > <c:forEach list="${meeting.storedEventsIterator}" >var="event"> > <c:set var="yapper" >value="${meeting.participation[event.fromId]}" /> > <c:choose> > <c:when test="${event.class.name eq >'fqcn.URLPushedEvent'}"> > <c:choose> > <c:when test="${yapper.role eq 'R'}"> > <c:set var="repId" >value="${yapper.participantId}" /> > <font >color="#000000"><b>${yapper.name}:</b></font> > </c:when> > <c:otherwise> > <font >color="#0000f0"><b>${yapper.name}:</b></font> > </c:otherwise> > </c:choose> > <a >href="${event.storedData}">"${event.storedData}"</a> <br> > </c:when> > <c:when test="${event.class.name eq >'fqcn.ChatEvent'}"> > <c:choose> > <c:when test="${yapper.role eq 'R'}"> > <font >color="#000000"><b>${yapper.name}:</b></font> > <c:set var="repId" >value="${yapper.participantId}" /> > </c:when> > <c:otherwise> > <font >color="#0000f0"><b>${yapper.name}:</b></font> > </c:otherwise> > </c:choose> > <a >href="${event.storedData}">"${event.storedData}"</a> <br> > </c:when> > </c:choose> > </c:forEach> > <hr> > <br>${meeting.meetingId}:${repId}<br> > </td> > </tr> ></table> >=== >The velocity version: >=== ><table width="600" border="0" cellspacing="0" cellpadding="4" > bgcolor="white"> > <tr> > <td> > <i><b>Topic: $meeting.getTopic()</b></i><p> > > #foreach( $event in $meeting.getStoredEventsIterator() ) > #set( $yapper = >$meeting.getParticipation($event.getFromId()) ) > > #if( $event.getClass().getName().equals($urlEvent) ) > > #if( $repRole.equals($yapper.getRole()) ) > #set( $repId = $yapper.getParticipantId() ) > <font >color="$blk"><b>$yapper.getName()</b></font> > > #else > <font >color="$blu"><b>$yapper.getName()</b></font> > #end > > <a >href="$event.getStoredData()">$event.getStoredData()</a> <br> > > #elseif( $event.getClass().getName().equals($chatEvent) ) > > #if($repRole.equals($yapper.getRole()) ) > #set( $repId = $yapper.getParticipantId() ) > <font >color="$blk"><b>$yapper.getName()</b></font> > > #else > <font >color="$blu"><b>$yapper.getName()</b></font> > #end > > $event.getStoredData() <br> > #end > > #end > <hr> > <br>$meeting.getMeetingId():$repId<br> > </td> > </tr> ></table> >=== > >Larry > > >--------------------------------------------------------------------- >To unsubscribe, e-mail: [EMAIL PROTECTED] >For additional commands, e-mail: [EMAIL PROTECTED] > > > >--------------------------------------------------------------------- >To unsubscribe, e-mail: [EMAIL PROTECTED] >For additional commands, e-mail: [EMAIL PROTECTED] > > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
