1、在web.xml中表明标签库，在JSP 的头部声明标签库调用< %@ taglib uri = "http://java.sun.com/portlet" prefix = "portlet" % >
标签：
在使用Portlet 典型标签之前，要见声明<portlet:defineObjects/>，这样才可以使用其他的标签。defineObjects 中间不允许定义任何属性和包含任何内容
renderURL 标签
属性 值类型 对应值
windowState string (minimized normal maximized)
portletMode string (view edit help) var string (...)
secure string (true false)
< portlet:renderURL portletMode = "view" windowState = "maximized" >
< portlet:param name = "number" value = "1" />
< portlet:param name = "page" value = "2" />
</ portlet:renderURL >
创建一个当前ActionURL ，当访问它时将使Portlet 窗口变为正常状态，模式变为编辑。<Portlet:param/> 子元素会在生成的ActionURL 中增加action 参数和值。renderURL 和actionURL 两个标签在诸如生成form 表单的action 等方面特别有用。
param 标签
用在renderURL 和actionURL 标签内部，用来在生成的URL 中增加参数和值。
namespace标签
为目前的Portlet 产生一个唯一的Value ，防止与其他Portlet 或者Portal 上面的Value 冲突。上述标签的具体属性及其约束， 请参阅${CATALINA_HOME}/liferay/WEB-INF/tld/liferay-portlet.tld
Here is an example how to use it in the code:
<script> function <portlet:namespace />myFunction() { alert("<portlet:namespace />myButton was clicked" ); } </script> <input type="button" id="<portlet:namespace />myButton" onclick="<portlet:namespace />myFunction();">liferay resourceURL标签
ResourceURL主要用作返回Portlet资源，比如js、css、swf文件，图片等
//output the image bytes here
}
参考：http://www.liferay.com/zh/community/forums/-/message_boards/message/943526
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actionURL 标签
属性 值类型 对应值
windowState string (minimized normal maximized)
portletMode string (view edit help) var string (...)
secure string (true false)
< portlet:actionURL windowState = "normal" PortletMode = "edit" >
< portlet:param name = "action" value = "login" />
</ portlet:actionURL >
创建一个当前RenderURL ，当访问它时将使Portlet 窗口变为最大化状态，模式变为浏览。<portlet:param/> 子元素会在生成的RenderURL 中增加number 、page 两个参数和值。
defineObjects 标签
<liferay-theme:defineObjects/>标签，该标签对应的DefineObjectsTag就是将很多liferay的变量放到pageContext。
<Portlet:DefineObjects>标签，将会在页面得到下列对象JSR 168 (Portlet 1.0)
In JSR 168 only three variables are defined:
* RenderRequest renderRequest
* RenderResponse renderResponse
* PortletConfig portletConfig
JSR 268 (Portlet 2.0)
In JSR 286 following variables are defined:
* RenderRequest renderRequest and RenderResponse renderResponse (if the JSP is included from render method)
* ResourceRequest resourceRequest and ResourceResponse resourceResponse (if the JSP is included from serveResource method)
* ActionRequest actionRequest and ActionResponse actionResponse (if the JSP is included from processAction method)
* EventRequest eventRequest and EventResponse eventResponse (if the JSP is included from processEvent method)
* PortletConfig portletConfig
* PortletSession portletSession (returns an existing session or null if no session exists)
* Map<String, Object> portletSessionScope (provides access to the portletSession attributes)
* PortletPreferences portletPreferences (provides access to the portlet preferences)
* Map<String, String[]> portletPreferencesValues (provides access to the portlet preferences as a Map)