GetAllSites.java

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import javax.portlet.Portlet;
import javax.portlet.PortletException;
import javax.portlet.RenderRequest;
import javax.portlet.RenderResponse;

import org.osgi.service.component.annotations.Component;

import com.liferay.portal.kernel.dao.orm.QueryUtil;
import com.liferay.portal.kernel.model.Group;
import com.liferay.portal.kernel.portlet.bridges.mvc.MVCPortlet;
import com.liferay.portal.kernel.service.GroupLocalServiceUtil;

import com.test.constants.SamepleCode
/**
 * @author https://beetechmantra.blogspot.com
 */
@Component(
    immediate = true,
    property = {
        "com.liferay.portlet.display-category=category.sample",
        "com.liferay.portlet.instanceable=true",
        "javax.portlet.init-param.template-path=/",
        "javax.portlet.init-param.view-template=/view.jsp",
        "javax.portlet.name=" + SamepleCode.SamplePortlet,
        "javax.portlet.resource-bundle=content.Language",
        "javax.portlet.security-role-ref=power-user,user"
    },
    service = Portlet.class
)
public class ContentTransferPortlet extends MVCPortlet {

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

        // get All the groups of the company. 
        List<Group> groups = GroupLocalServiceUtil.getGroups(QueryUtil.ALL_POS, QueryUtil.ALL_POS);

        for (Group group: groups) {

            if (group.isSite()) {

                System.out.println(group.getName());
                System.out.println(group.getGroupKey());

            }
        }

        super.render(renderRequest, renderResponse);
    }
}