Portlet Preferences Example Program:

Portlet Preferences Example Program:

package com.prf;

import java.io.IOException;

import javax.portlet.ActionResponse;

import javax.portlet.PortletException;

import javax.portlet.PortletPreferences;

import com.liferay.portal.kernel.exception.SystemException;

import com.liferay.portal.kernel.util.ParamUtil;

import com.liferay.portlet.PortletPreferencesFactoryUtil;

import com.liferay.util.bridges.mvc.MVCPortlet;

import com.liferay.portal.*;

import com.liferay.portlet.*;

import javax.portlet.ActionRequest;

/**

 * Portlet implementation class PrfPortlet

 */

public class PrfPortlet extends MVCPortlet {

     

public void changePref(ActionRequest req,ActionResponse res) throws IOException,PortletException, SystemException

{

      String dname=req.getParameter("department");

      //getting portlet resource

      System.out.println(dname);

      String portletResource=ParamUtil.getString(req,"PortletResource");

      PortletPreferences pre=req.getPreferences();

      pre.setValue("deptname", dname);

      pre.store();

      String str=pre.getValue("deptname","");

      System.out.println(str);

     

}

}

Portlet.xml:

<?xml version="1.0"?>

      <portlet>

            <portlet-name>prf</portlet-name>

            <display-name>Prf Portlet</display-name>

            <portlet-class>com.prf.PrfPortlet</portlet-class>

            <init-param>

                  <name>view-jsp</name>

                  <value>/html/prf/view.jsp</value>

            </init-param>

            <init-param>

                  <name>edit-jsp</name>

                  <value>/html/prf/edit.jsp</value>

            </init-param>

            <expiration-cache>0</expiration-cache>

            <supports>

                  <mime-type>text/html</mime-type>

                  <portlet-mode>view</portlet-mode>

                  <portlet-mode>edit</portlet-mode>

            </supports>

            <resource-bundle>content/Language</resource-bundle>

            <portlet-info>

                  <title>Prf Portlet</title>

                  <short-title>Prf Portlet</short-title>

                  <keywords></keywords>

            </portlet-info>

            <portlet-preferences>

            <preference>

            <name>deptname</name>

            <value>computers</value>

            </preference>

            <preference>

            <name>company</name>

            <value>vidyayug</value>

            </preference>

            </portlet-preferences>

           

            <security-role-ref>

                  <role-name>administrator</role-name>

            </security-role-ref>

            <security-role-ref>

                  <role-name>guest</role-name>

            </security-role-ref>

            <security-role-ref>

                  <role-name>power-user</role-name>

            </security-role-ref>

            <security-role-ref>

                  <role-name>user</role-name>

            </security-role-ref>

      </portlet>

</portlet-app>

View.jsp:

<%@page import="com.liferay.portal.kernel.util.Validator"%>

<%@page import="com.liferay.portal.kernel.util.ParamUtil"%>

<%@page import="com.liferay.portlet.PortletPreferencesFactoryUtil"%>

<%@page import="javax.portlet.PortletPreferences"%>

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

<%@page import="javax.portlet.PortletRequest"%>

<%@page import="com.liferay.portal.util.PortalUtil"%>

<%@page import="javax.portlet.PortletContext"%>

<%@page import="javax.portlet.ActionRequest"%>

<portlet:defineObjects />

<%

PortletPreferences preferences = renderRequest.getPreferences();

String portletResource = ParamUtil.getString(request, "portletResource");

if (Validator.isNotNull(portletResource)) {

   preferences = PortletPreferencesFactoryUtil.getPortletSetup(request, portletResource);

}

 String department = preferences.getValue("deptname","");

 %>

 <%=department %>

<portlet:renderURL  var="modifypreference">

<portlet:param name="jspPage" value="/html/prf/modifypreference.jsp"></portlet:param>

</portlet:renderURL>

<a href="<%=modifypreference%>"> modify the preference</a>

Modify.jsp

<%@page import="javax.portlet.ActionRequest"%>

<%@page import="javax.portlet.RenderResponse"%>

<%@page import="javax.portlet.PortletURL"%>

<%@page import="com.liferay.portlet.PortletPreferencesFactoryUtil"%>

<%@page import="javax.xml.validation.Validator"%>

<%@page import="com.liferay.portal.util.PortalUtil"%>

<%@page import="javax.portlet.PortletPreferences"%>

<%@page import="javax.portlet.RenderRequest"%>

<%@page import="com.liferay.portal.kernel.util.ParamUtil"%>

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

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

<portlet:defineObjects />

<%

PortletPreferences preferences = PortalUtil.getPreferences(request);

String portletResource = ParamUtil.getString(request, "portletResource");

preferences = PortletPreferencesFactoryUtil.getPortletSetup(request, portletResource);

String department = preferences.getValue("deptname","");

%>

<%=department%>

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

<%@page import ="javax.portlet.PortletURL" %>

<%@ page import="javax.portlet.RenderResponse" %>

<%@ page import="javax.portlet.ActionRequest" %>

<%

PortletURL changePrefURL=renderResponse.createActionURL();

changePrefURL.setParameter(ActionRequest.ACTION_NAME,"changePref");

%>

<center>

<form action="<%=changePrefURL.toString()%>" method="POST" name="<portlet:namespace />fm">

  <table>

    <tr>

      <td class="lfr-label">Page Title</td>

      <td><input name="<portlet:namespace />department" type="text" value="<%= department%>"/></td>

    </tr>

  </table>

  <input type="submit" value="click" />

</form>

</center>

In the above example what I have done is first i set the portlet preferences in portlet.xml and next I have read that preferences in view.jsp next I have choose the form in that I passed the preference deptname dynamically  and I was set the preference in portlet class method.