第一种在http://www.jboss.org/tools/download/stable/3_0_GA.html网页上下载需要的插件，
http://downloads.sourceforge.net/jboss/FreeMarkerIDE-1.0.2.v200910211631N-H194-GA.zip，解压，把features和plugins的东东加到elispe的features和plugins下，重启eclispe
第二种方式
Help -> Software updates -> Find and install....
Choose "Search for new features to install".
Click Add Update Site..., and type "jboss" for Name and " http://download.jboss.org/jbosstools/updates/JBossTools-3.0.3.GA" for URL.
Check the box of the "FreeMarker" feature.
"Next"-s until it is installed...
第二种好像需要lisence 我这里采用第一种