Using Liferay Util Param
The param tag lets you set a parameter for an included JSP page. This configuration requires two JSPs. JSP A, the main view of the app, includes JSP B and sets its parameter value. This lets you dynamically set content when you include the JSP.
For example, say you have your main functionality in my-app.jsp, and you have additional functionality provided by more-content.jsp. You could have the example configuration shown below:
more-content.jsp:
<%@ page import="com.liferay.portal.kernel.util.ParamUtil" %>
<%
String answer = ParamUtil.getString(request, "answer");
%>
<div>
<p>The answer to life, the universe and everything is <%= answer %>.</p>
</div>
Then in my-app.jsp, you can include more-content.jsp and set the value of the answer parameter:
<liferay-util:include page="/path/to/more-content.jsp" servletContext="<%= application %>">
<liferay-util:param name="answer" value="42" />
</liferay-util:include>
This results in the following output in my-app.jsp:
The answer to life, the universe and everything is 42.
Now you know how to use the <liferay-util:param> tag to set parameters for included JSPs. You can use this approach to include common reusable pieces of code in your apps.