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publicvoid build( RequestContext context ){//取得requested page
    ContentPage page=context.getPage();
   
    //取得 root fragment
    ContentFragment root = page.getRootContentFragment();
    
    //aggregate及render各個Portlet，基本上render的結果都寫到context裡
    aggregateAndRender(root, context, page);
 
    //將結果寫入response
    context.getResponse().getWriter().write(root.getRenderedContent());
    
}

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protectedvoid aggregateAndRender( ContentFragment f, RequestContext context, ContentPage page ){
 
    Iterator children = f.getContentFragments().iterator();
    while (children.hasNext()){
        ContentFragment child = (ContentFragment) children.next();
        
        //遞迴
        aggregateAndRender(child, context, page);
    }// 開始真正做render的動作，基本上render的結果都寫到context裡
     renderer.render(f, context);  //renderer是org.apache.jetspeed.aggregator.impl.PortletRendererImpl//加上decoration
     addStyle(context, f.getDecorator(),ContentFragment.PORTLET);
       
}

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package sample;
 
import java.io.IOException;
 
import javax.portlet.ActionRequest;
import javax.portlet.ActionResponse;
import javax.portlet.GenericPortlet;
import javax.portlet.PortletException;
import javax.portlet.PortletRequestDispatcher;
import javax.portlet.PortletSession;
import javax.portlet.RenderRequest;
import javax.portlet.RenderResponse;
 
publicclass EchoPortlet extends GenericPortlet{protectedvoid doView(RenderRequest renderRequest, RenderResponse renderResponse)throws PortletException, IOException {
        renderResponse.setContentType("text/html");
        
        String jspName = "/jsp/echo.jsp";
       
        PortletRequestDispatcher rd = getPortletContext().getRequestDispatcher(jspName);
        rd.include(renderRequest, renderResponse);
  }
 
  /* (non-Javadoc)
   * @see javax.portlet.GenericPortlet#processAction(javax.portlet.ActionRequest, javax.portlet.ActionResponse)
   */publicvoid processAction(ActionRequest actionRequest, ActionResponse actionResponse) throws PortletException, IOException {
    PortletSession session=actionRequest.getPortletSession();
    session.setAttribute("LAST_TYPED_STRING",actionRequest.getParameter("input")) ;
  }}
 

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<%@ page language="java" session="true" import="javax.portlet.PortletSession"%>
<%@ taglib uri='/WEB-INF/portlet.tld' prefix='portlet'%>
<portlet:defineObjects/>
<portlet:actionURL var="action" />
<p></p>
<%
PortletSession  portletSession=renderRequest.getPortletSession();
String lastTypedString=(String)portletSession.getAttribute("LAST_TYPED_STRING");
if(lastTypedString!=null&&lastTypedString.length()>0){
%>
  The string you typed is:<b><%=lastTypedString%></b>
  <br/>
<%}%>
  <form action="<%=action%>" method="post">
    <input type="text" name="input" id="input" />
    <input type="submit" value="submit" />
  </form>
 
<p></p>

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<?xml version="1.0" encoding="UTF-8"?>
<portlet-app id="sample">
        <portlet id="EchoPortlet">
                <portlet-name>Echo Portlet</portlet-name>
                <portlet-class>sample.EchoPortlet</portlet-class>
 
                <expiration-cache>30</expiration-cache>
                <supports>
                        <mime-type>text/html</mime-type>
                        <portlet-mode>view</portlet-mode>
                </supports>
                <supported-locale>en-US</supported-locale>
                <portlet-info>
                        <title>EchoPortlet</title>
                        <short-title>EchoPortlet</short-title>
                        <keywords>EchoPortlet</keywords>
                </portlet-info>
                
        </portlet>
</portlet-app>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN""http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
  <display-name>Sample</display-name>
</web-app>

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<?xml version="1.0" encoding="UTF-8"?>
<page id="/Sample.psml" hidden="false" version="">
    <title>Sample</title>
    <short-title>Sample</short-title>
    <defaults layout-decorator="tigris" portlet-decorator="tigris"/>
    <fragment id="P-1082c720c8c-10000" type="layout" name="jetspeed-layouts::VelocityTwoColumns">
    
      <fragment id="28825252" type="portlet" name="sample::EchoPortlet">
        <property layout="TwoColumns" name="row" value="0" />
        <property layout="TwoColumns" name="column" value="0" />
      </fragment>
      
    </fragment>
</page>