Show all users liferay - liferay

Question

I need to make a portlet which would show all registred users in liferay.
Im not asking you to write all code here, but I would aprreciate if u could present an step-by-step plan of actions, cause I really don't understand how to get info from database.
UPD:
1. I can`t solve what should I import in java file.
import java.io.IOException;
import java.util.List;
import javax.portlet.PortletException;
import javax.portlet.PortletPreferences;
import javax.portlet.RenderRequest;
import javax.portlet.RenderResponse;
import javax.transaction.SystemException;
import com.liferay.portal.kernel.dao.orm.QueryUtil;
import com.liferay.portal.model.User;
import com.liferay.portal.service.UserLocalServiceUtil;
import com.liferay.util.bridges.mvc.MVCPortlet;
public class ShowUsers extends MVCPortlet {
public void render(RenderRequest renderRequest, RenderResponse renderResponse) throws IOException, PortletException{
Log log = LogFactoryUtil.getLog(ShowUsers.class);
List<User> users = null;
try {
users = UserLocalServiceUtil.getUsers(QueryUtil.ALL_POS, QueryUtil.ALL_POS);
} catch (com.liferay.portal.kernel.exception.SystemException e) {
log.info("Exception happened");
}
renderRequest.setAttribute("allUsers", users );
super.render(renderRequest, renderResponse);
}
}
===================
My jsp file:
<%# taglib uri="http://java.sun.com/portlet_2_0" prefix="portlet" %>
<%# page import="java.util.List" %>
<%# page import="com.liferay.portal.model.User" %>
<%# taglib uri="http://java.sun.com/portlet_2_0" prefix="portlet" %>
<portlet:defineObjects />
<%
List<User> thatusers = renderRequest.getAttribute("allUsers");
%>
<ul>
<% for (User user : thatusers) { %>
<li><%= user %></li>
<% } %>
</ul>
And after this code I have strange info about all users and I need only it's name! this:
{uuid=fb7224c0-2488-45c1-97b8-5608450435a6, userId=20199, companyId=20155, createDate=2016-06-06 08:14:14.0, modifiedDate=2016-06-06 08:14:14.0, defaultUser=false, contactId=20200,

Answer 1

To get all users take a look at UserLocalServiceUtil.getUsers()
In your portlet class you need to pass this list to the jsp you are serving:
public void doView(RenderRequest renderRequest, RenderResponse renderResponse)
throws IOException, PortletException {
List<User> users = UserLocalServiceUtil.getUsers(QueryUtil.ALL_POS, QueryUtil.ALL_POS);
renderRequest.setAttribute("allUsers", users );
super.doView(renderRequest, renderResponse);
}
And than in your jsp iterate the allUsers list using JSTL to get a user object.
getUsers(QueryUtil.ALL_POS, QueryUtil.ALL_POS); would retrieve all the users, instead of QueryUtil.ALL_POS you can specifie start and end if you need to paginate the result.