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Including an Image in the Portlet Content
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Our portlet needs to display an image when it is in VIEW mode. It is easy to include an image in the portlet display if another machine serves the file it is just a normal <IMG> HTML tag:
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<IMG SRC="http://www.myserver.com/images/Sailboat.jpg">
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If the image is packaged into a portlet application along with the portlet classes and any servlets, JSP files, or style sheets needed, including it in the portlet gets a little more complicated. We cannot just use relative links to static files that could be served up from the portlet application because the portal could be using the URL of the portal page for any purpose it needs the URL on the end user s web browser may not necessarily correspond to the context path of the deployed portlet application. Here is the relevant portion of our doView() method:
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writer.write( "<IMG SRC=" + renderResponse.encodeURL( renderRequest.getContextPath() + "/images/picture.jpg") + ">");
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We will need to ask the portlet request for the context path of the running portlet, which we can use to construct links to the files included in the portlet application. The deployment of the portlet application on the portal determines the portlet application s context path. For example, if the portlet application archive file is called myapp.war, the portal administrator might have assigned the context path to be /myapp when deploying the portlet application on the portal. The portal would refer to the path /myapp to find the portlet application. The getContextPath() method on the PortletRequest interface class is used to obtain the context path to build links:
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public String getContextPath()
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Because the portal could be using the URL to embed any information it needs for itself, we will need to ask the portal to encode the URL that the portlet renders for its display in HTML. We can use the encodeURL() method on the PortletResponse object that was passed as an argument to our doView() method:
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public String encodeURL (String path)
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Portlet Basics
Any external resources in the portlet application that are referenced as URLs in the portlet s displayed HTML content need to be referred to like the directions for the image in the AdvancedPortlet. This includes JavaScript source files, Cascading Style Sheet (CSS) files, images, Flash objects, and other multimedia elements. The doView() method will be used much more often than the doHelp() method, which services the HELP portlet mode.
The doHelp() Method
The doHelp() method is very straightforward. It simply displays a basic help message in its content. We have already covered the portlet concepts used here in the opening section of this chapter, on our first portlet. Here is the doHelp() method on our AdvancedPortlet class:
protected void doHelp( RenderRequest renderRequest, RenderResponse renderResponse) throws PortletException, IOException { //return a helpful message renderResponse.setContentType("text/html"); Writer writer = renderResponse.getWriter(); writer.write( "This portlet allows you to change its content and title."); }
The AdvancedPortlet class is the only Java class we have created for this portlet application. Now let s create a portlet application deployment descriptor to describe our portlet.
The portlet.xml Deployment Descriptor
The deployment descriptor for this portlet application includes all of the elements that were in the portlet.xml from the first portlet in this chapter, and we added support for several new portlet deployment descriptor elements:
< xml version="1.0" encoding="UTF-8" > <portlet-app xmlns="http://java.sun.com/xml/ns/portlet/portlet-app_1_0.xsd" version="1.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/portlet/portlet-app_1_0.xsd http://java.sun.com/xml/ns/portlet/portlet-app_1_0.xsd">
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<portlet> <description>Advanced Portlet Description</description> <portlet-name>AdvancedPortlet</portlet-name> <display-name>Advanced Portlet</display-name> <portlet-class>com.portalbook.portlets.AdvancedPortlet</portlet-class> <expiration-cache>-1</expiration-cache> <supports> <mime-type>text/html</mime-type> <portlet-mode>VIEW</portlet-mode> <portlet-mode>EDIT</portlet-mode> <portlet-mode>HELP</portlet-mode> </supports> <supported-locale>en</supported-locale> <portlet-info> <title>Advanced Portlet</title> <short-title>Adv. Portlet</short-title> <keywords>Advanced</keywords> </portlet-info> </portlet> </portlet-app>
The advanced portlet needs to support the EDIT and HELP portlet modes, along with the VIEW mode we used in the first portlet. The portal will provide access to the different supported portal modes. Portals should allow access only to the modes the portlet supports, and remove any user interface elements that allow access to the unsupported modes for a portlet. We also included the <supported-locale> element in the deployment descriptor. The <supported-locale> element is used to support multilingual portals that allow the user to choose a favorite language and see their portlets in that language if supported. Portals could also use the <supported-locale> element for the user s customization of portal pages. Portlets could be organized in a catalog by language. Our portlet supports only English. The <portlet-info> element is used to specify metadata about the portlet. The <title> element is used to specify a title that the portal can use when it displays the portlet. The <short-title> element is a briefer version of the title. Our portlet also supplies a keyword with the <keywords> element. Portals could allow end users to search through the portlet catalog for a term that matches one of the keywords for a portlet. The keywords could also be displayed in the catalog as helpful information. Here is the complete code listing for our AdvancedPortlet class:
package com.portalbook.portlets; import java.io.IOException; import java.io.Writer;
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