尝试
#set($contextTool = $portal.getClass().forName("full.package.ContextTool").newInstance())
编辑
如果我理解你的话,这应该给你你想要的
#set($ve = $serviceLocator.findService("com.liferay.portal.kernel.velocity.VelocityEngine"))
#set($wvc = $ve.getWrappedStandardToolsContext().getWrappedVelocityContext())
#set($cVE = $portal.getClass().forName("org.apache.velocity.app.VelocityEngine"))
#set($cHSREQ = $portal.getClass().forName("javax.servlet.http.HttpServletRequest"))
#set($cHSRES = $portal.getClass().forName("javax.servlet.http.HttpServletResponse"))
#set($cSC = $portal.getClass().forName("javax.servlet.ServletContext"))
#set($cCC = $portal.getClass().forName("org.apache.velocity.tools.view.context.ChainedContext"))
#set($cVEI = $portal.getClass().forName("com.liferay.portal.velocity.VelocityEngineImpl"))
#set($cC = $portal.getClass().forName("org.apache.velocity.context.Context"))
#set($cVEU = $portal.getClass().forName("com.liferay.portal.kernel.velocity.VelocityEngineUtil"))
#set($ve = $cVEU.getMethod("getVelocityEngine").invoke(null))
#set($fVE = $cVEI.getDeclaredField("_velocityEngine"))
$fVE.setAccessible(true)
#set($cc = $cCC.getConstructor($cC, $cVE, $cHSREQ, $cHSRES, $cSC).newInstance($wvc, $fVE.get($ve), $request, $response, $request.getSession().getServletContext()))
#set($contextTool = $portal.getClass().forName("org.apache.velocity.tools.view.tools.ContextTool").newInstance())
$contextTool.init($cc)
之后,您可以使用,例如
$contextTool.getKeys()
如果这不是您需要的,请告诉我...