Simple util class to create various URLs in Spring MVC controllers used in Liferay portlets.

PortletUtils.java

package sk.o2.assistant.portlet.common.util;

import javax.portlet.PortletURL;
import javax.portlet.RenderResponse;
import javax.portlet.ResourceURL;

public final class PortletUtils {

    private static final String PORTLET_ACTION_NAME = "javax.portlet.action";

    /**
     * Creates an URL for @ActionMapping
     *
     * @param action   value from @ActionMapping annotation
     * @param response portlet render response
     * @return an URL with portlet action
     */
    public static String getPortletActionUrl(String action, RenderResponse response) {
        PortletURL actionURL = response.createActionURL();
        actionURL.setParameter(PORTLET_ACTION_NAME, action);

        return actionURL.toString();
    }

    /**
     * Creates an URL for @ResourceMapping
     *
     * @param resource value from @ResourceMapping annotation
     * @param response portlet render response
     * @return an URL with portlet resource
     */
    public static String getPortletResourceUrl(String resource, RenderResponse response) {
        ResourceURL resourceURL = response.createResourceURL();
        resourceURL.setResourceID(resource);

        return resourceURL.toString();
    }
}