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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"> <portlet> <description>First Portlet for the Apress Portlet book by Jeff Linwood and David Minter.</description> <portlet-name>FirstPortlet</portlet-name> <display-name>First Portlet</display-name> <portlet-class>com.portalbook.portlets.FirstPortlet</portlet-class> <expiration-cache>-1</expiration-cache> <supports> <mime-type>text/html</mime-type> <portlet-mode>VIEW</portlet-mode> </supports> <portlet-info> <title>First Portlet</title> <short-title>1st Portlet</short-title> <keywords>First, Portlet</keywords> </portlet-info> </portlet> </portlet-app>
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The portlet deployment descriptor has to comply with the portlet API XML schema definition file. One basic best practice is to use a validating XML editor any time you edit a deployment descriptor it is too easy to edit one with a regular text editor like Notepad or vi and accidentally forget to escape an entity or something similar. The <portlet-app> element of the deployment descriptor is the root of the XML document. The root is the container for information about the portlets in the portlet application. It also contains any custom portlet modes, custom window states, user attributes, or security constraints that the portlet application supports. For our first portlet, we are only going to describe a portlet. The next element in the portlet.xml deployment descriptor is <portlet>, which represents one of the available portlets in the portlet application. There can be more than one <portlet> element under a <portlet-app> element. We define each portlet that could be included in a portal here as a <portlet> element. We go on to give the portlet an optional description, which could be used by the portal to display information about the portlet to a portal administrator or users who are customizing their portal page to include relevant portlets. We will use our <description> element to include some information about the portlet. The <description> element is optional. The next element underneath <portlet> is <portlet-name>, which is required. This name has to be unique across all portlets in the portlet application. The portal
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will use it for internal purposes to differentiate portlets in a portlet application. The portal can also use the portlet name to display a name to the end user, if the <display-name> element is not defined.
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TIP Although the portlet name has to be unique within a portlet application, it is possible that one portal could have portlets in different portlet applications with the same name. It is also possible that you could install the same portlet application on a portal twice, in different contexts. The portal will use a combination of the portlet application context and the portlet name to refer to the portlet. As an aside, you can also have the same portlet in more than one place in the portal page.
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The <display-name> element contains a name that is suitable for presenting to the user or administrator. Unlike the <portlet-name> element, it does not have to be unique, and it is not a required element in a portlet.xml deployment descriptor. We need to specify the Java class we are going to use for this portlet in the <portlet-class> element. The class name specified here should be a fully qualified class name. The class itself either should be in a directory under WEB-INF/classes, or packaged up in a JAR file in the WEB-INF/lib directory of the portlet application. These are the same requirements for packaging a class as the J2EE web application packaging standard. The <portlet-class> element is required in the portlet.xml deployment descriptor. The <expiration-cache> element in the deployment descriptor controls caching for the portlet s content. We discuss caching in 4. Each portlet is expected to contribute part of the portal page. For most application development, portlets will produce HTML or XHTML content. Other content types are possible for portlets, such as WML for wireless applications. Portlets will need to set the content type on the render response object. In our first portlet, we set the content type to text/html , for returning HTML content. For HTML or XHTML content, portlets need to support a limited set of HTML elements. The content a portlet returns is integrated into the portal page, which already has <HEAD>, <BODY>, <HTML>, and <TITLE> elements. The portlet should not use any of those elements, or the <BASE>, <FRAME>, or <FRAMESET> HTML tags. All portlets should return valid content, with matched HTML tags, where appropriate. The portlet also shouldn t rely on any particular HTML (like tables) rendered in the portal page. The <supports> element defines the supported portlet modes for each Multipurpose Internet Mail Extensions (MIME) type. Each portlet definition requires at least one <supports> element, but can have more if needed to support markup types such as HTML, text, or WML. The <supports> element contains a supported MIME type, and one or more supported portlet modes. The
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