indiWiz.com » portlet http://indiwiz.com Subhash's Tech Log Sun, 29 Apr 2012 15:11:41 +0000 en hourly 1 http://wordpress.org/?v=3.3.1 Serving Static and Dynamic Resources in JSR 286 http://indiwiz.com/2009/02/20/serving-static-and-dynamic-resources-in-jsr-286/ http://indiwiz.com/2009/02/20/serving-static-and-dynamic-resources-in-jsr-286/#comments Fri, 20 Feb 2009 11:45:08 +0000 Subhash Chandran http://indiwiz.com/?p=210

To serve static content packaged as part of the portlet WAR, we generally take this approach:

<%=response.encodeURL(request.getContextPath()+"/js/project.js")%>

For generating dynamic content what do we do? In JSR 168 this was not possible. Thankfully, JSR 286 introduced this important concept. For creating dynamic content, just override the void serveResource(ResourceRequest request, ResourceResponse response) method in javax.portlet.ResourceServingPortlet (implemented by javax.portlet.GenericPortlet). A simple example:

    @Override
    public void serveResource(ResourceRequest request, ResourceResponse response)
            throws PortletException, IOException {
        String paramValue = request.getParameter("abc");
        System.out.println(paramValue);
        response.setCharacterEncoding("UTF-8");
        response.setContentType("text/plain");
        PrintWriter pw = response.getWriter();
        pw.println(paramValue);
        pw.close();
    }

To link to this dynamic content:

<portlet:resourceURL var="url">
  <portlet:param name="abc" value="Hello World"/>
</portlet:resourceURL>

<a href="<%=url%>">Dynamic link</a>
]]> http://indiwiz.com/2009/02/20/serving-static-and-dynamic-resources-in-jsr-286/feed/ 2 JSR-286: Adding Header Elements http://indiwiz.com/2008/11/19/jsr-286-adding-header-elements/ http://indiwiz.com/2008/11/19/jsr-286-adding-header-elements/#comments Wed, 19 Nov 2008 15:23:25 +0000 Subhash Chandran http://indiwiz.wordpress.com/?p=20

Some HTML elements like <link>, <script> may need to be placed in the HTML’s <head> section. For such needs, JSR-286 defines a standard way:

import javax.portlet.GenericPortlet;
import javax.portlet.RenderRequest;
import javax.portlet.RenderResponse;
import javax.portlet.MimeResponse;
import org.w3c.dom.Element;

...

public class MyPortlet extends GenericPortlet {
  @Override
  protected void doHeaders(RenderRequest request, RenderResponse response){
    Element e = response.createElement("link");
    e.setAttribute("rel", "stylesheet");
    e.setAttribute("type", "text/css");
    e.setAttribute("href", "abc.css");
    response.addProperty(MimeResponse.MARKUP_HEAD_ELEMENT, e);
  }
}

response.addProperty(MimeResponse.MARKUP_HEAD_ELEMENT, ...) might be called for adding any number of headers.

We also have to add this in the portlet.xml (either in portlet scope or application scope):

<container­-runtime­-option>
  <name>javax.portlet.renderHeaders</name>
  <value>true</value>
</container­-runtime­-option>

This is because javax.portlet.renderHeaders is set to false by default.

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