Liferay is easy: Developing a MVCPortlet with Multiple Render Methods in Liferay

In the previous blog Developing a MVCPortlet with Multiple Actions in Liferay we see how we can handle multiple action methods in a single portlet. Today we will discuss how to develop a MVCPortlet with multiple render methods in Liferay. Here we create a portlet that contain 4 render methods that will redirect to different jsps that contain simple messages.So lets start this step by step:-

Step 1:-Create Liferay Project and Portlet
Create a Liferay plugin project and than create a portlet in it. You can check snapshot in my previous blog Developing a MVCPortlet with Multiple Actions in Liferay.

Step 2:-Change view.jsp
Open view.jsp and paste this content:-

view.jsp

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

	<portlet:renderURL var="firstRenderURL">
	<portlet:param name="mvcPath" value="/html/demo/first.jsp" />
	</portlet:renderURL>
	<portlet:renderURL var="secondRenderURL">
	<portlet:param name="mvcPath" value="/html/demo/second.jsp" />
	</portlet:renderURL>

	<!-- ActionURLs but in Controller i use for rendering-->
	<portlet:actionURL var="thirdRenderURL" name="CustomRenderMethod">
	<portlet:param name="nameofjsp" value="third" />
	</portlet:actionURL>

	<portlet:actionURL var="fourthRenderURL" name="CustomRenderMethod">
	<portlet:param name="nameofjsp" value="fourth" />
	</portlet:actionURL>

	<h4>First Form</h4>
	<a href="${firstRenderURL}" >Go to First JSP</a><br>
	<a href="${secondRenderURL}" >Go to Second JSP</a><br>

	<h4>Second Form</h4>
	<a href="${thirdRenderURL}" >Go to Third JSP</a><br>
	<a href="${fourthRenderURL}" >Go to Fourth JSP</a>

view raw view.jsp hosted with ❤ by GitHub

Explanation:-
Here we simply 4 URLs 2 renderURLs that use param mvcPath that will redirect to corresponding jsps. And 2 actionURLs that go to controller where we redirect to different jsps.

Step 3:-Change the Controller
Open your java class and paste this:-

Demo.java

	package com.demo;

	import java.io.IOException;
	import javax.portlet.ActionRequest;
	import javax.portlet.ActionResponse;
	import javax.portlet.PortletException;
	import com.liferay.portal.kernel.util.ParamUtil;
	import com.liferay.util.bridges.mvc.MVCPortlet;

	public class Demo extends MVCPortlet {
	public void CustomRenderMethod(ActionRequest actionRequest,ActionResponse actionResponse) throws IOException, PortletException {
	String nameofjsp = ParamUtil.getString(actionRequest, "nameofjsp");
	if(nameofjsp.equalsIgnoreCase("third")){
	actionResponse.setRenderParameter("mvcPath","/html/demo/third.jsp");
	}
	else{
	actionResponse.setRenderParameter("mvcPath","/html/demo/fourth.jsp");
	}
	}

	}

view raw Demo.java hosted with ❤ by GitHub

Explanation:-
Here we create a method customRenderMethod that check the value of parameter nameofjsp and then set the parameter mvcPath.

Step 4:-Check the Output
Deploy the portlet and add this to a page :-