Call jsp page from Liferay Portal

Question

Im a newbie in Liferay development and I have a pretty simple question.

I have an example of portlet that shows a text message and I need to display in the Liferay Portal. How can I do this ? the JSP code is below:

<%@ taglib uri="http://java.sun.com/portlet_2_0" prefix="portlet" %> 
<%@ page import="javax.portlet.PortletPreferences" %> 

<portlet:defineObjects /> 

<% 
     PortletPreferences prefs = renderRequest.getPreferences();
     String greeting = (String)prefs.getValue( "greeting", "Hello! Welcome to our portal."); 
%>

<p><%= greeting %></p>

Answer 1

EDIT

How can I write the same portlet without java code in view.jsp file?

You must override MVCPortlets doView method to initialize an attribute, let's consider the attribute greeting. For example:

public class Greeting extends MVCPortlet {

    @Override
    public void doView(RenderRequest renderRequest, RenderResponse renderResponse) throws IOException, PortletException {

        renderRequest.setAttribute("greeting", "Hello! Welcome to our portal.");

        super.doView(renderRequest, renderResponse);
    }
}

And in your JSP file, retrieve the greeting attribute using EL ${greeting}.

<%@ taglib uri="http://java.sun.com/portlet_2_0" prefix="portlet" %> 

<portlet:defineObjects /> 

<p>${greeting}</p>

Ouput:

Hello! Welcome to our portal.