如何在Liferay上获得用户的名字？

Question

I'm new to both Liferay and Java and I've been struggling for a day on how to get the user firstname, the documentation on this product is really poor so any help would be highly appreciated. So I'am working on a portlet and i want it to display the users first name, this is the view.jsp file:

<%@ taglib uri="http://java.sun.com/portlet_2_0" prefix="portlet" %>
<%@ page import="javax.portlet.PortletPreferences" %>
<%@ page import="com.liferay.portal.model.UserModel " %>
<%@ taglib uri="http://liferay.com/tld/ui" prefix="liferay-ui" %>
<portlet:defineObjects />


<liferay-ui:success key="success" message="Greeting saved
       successfully!" />

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

%>
<p><%= greeting %></p>
<portlet:renderURL var="editGreetingURL">
<portlet:param name="mvcPath" value="/edit.jsp" />
<portlet:param name="userName" value="Test" />

</portlet:renderURL>

<p><a href="<%= editGreetingURL %>">Edit greeting</a></p>

I already played with the usermodel class or interface, I actually found the method :getFirstName() but I just cant get it to work.

Answer 1

Another alternative would be to use the Liferay ThemeDisplay like so:

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

<%= themeDisplay.getUser().getFirstName() %>

Although I'd advise against using JSP Scriptlets in your code, and do this in Java in your portlet class code.

~~ EDIT: Adding alternative to use User more than once ~~

An example of useing a mixture of Tony's and my approaches would be like so:

<%= com.liferay.portal.model.User user = themeDisplay.getUser(); %>

~~ EDIT 2: To do this in Java code ~~

See my Gist here: https://gist.github.com/4060650

it can be further simplified with using JSTL to get rid of all scriptlets.

Answer 2

Try adding to the jsp:

<% 
com.liferay.portal.model.User user = 
      com.liferay.portal.util.PortalUtil.getUser(request);
String firstName = user.getFirstName();
%>
<p>User First Name=<%= firstName %></p>

I added the full package for ease of understanding.