在Liferay中，不能直接从Request中获取参数，你可以通过如下代码来获取参数：
分别有以下几种情况：
In JSP:
String paramValue = PortalUtil.getOriginalServletRequest(request).getParameter("paramName");
In render() :
HttpServletRequest request = PortalUtil.getHttpServletRequest(renderRequest);
String paramValue = PortalUtil.getOriginalServletRequest(request).getParameter("paramName");
In processAction() :
HttpServletRequest request = PortalUtil.getHttpServletRequest(actionRequest);
String paramValue = PortalUtil.getOriginalServletRequest(request).getParameter("paramName");
