Embedding web content inside portlet

Add this code in your jsp

<liferay-ui:journal-article articleId="<%=myarticleId%>" groupId="<%=themeDisplay.getLayout().getGroupId()%>"/> 

//myarticleId --> your journal article Id

To use liferay-ui tag add liferay ui tag library

<%@ taglib uri="http://liferay.com/tld/ui" prefix="liferay-ui" %>