java qr code generator tutorial Integrating Existing Applications into the Portal in Java

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Integrating Existing Applications into the Portal
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There are several approaches to bringing existing applications into a portal environment. The application can have a WSRP layer written on top, and host itself as a portlet producer. Another approach that uses SOAP is to completely write a thin web services layer on top of the core functionality, and then develop a portlet for that application. For Java applications that do not have a services layer to expose, or where the value of the application is in the user interface, it makes sense to consider rewriting the application as a portlet or set of portlets. The business logic and persistence can be factored out of the existing application as it is rewritten. This creates a common base layer for both the new portlet user interface and the existing user interface. Non-Java applications will have to be exposed using SOAP or another crossplatform API. For mainframe and AS/400 character mode applications, several commercial screen scraper products can translate a terminal interface into calls to and from a Java application. The portal may use a proxy portlet to serve existing web-based applications through the portal. The proxy portlet receives a request from the portal s end user and translates it into a web request for the existing application. The existing application responds to the proxy portlet s request with a response, which the proxy portlet then translates into a response for the portal. The portal aggregates that response with the rest of its content to produce a page for the end user. Some of the issues to consider when designing a proxied system like this one are SSO and security, personalization, a consistent look and feel, and the ability to keep track of sessions at the proxy portlet level. We convert a web-based open source message board to use portlets in 13. We used the open source forums package YAZD as the beginning of our project. YAZD is built on a servlet and JSP architecture. We built a controller portlet that dispatches requests to the appropriate JSP page.
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Using Charts in the Portal
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Business intelligence and other analytical applications often use charts to communicate information. Some portal projects create digital dashboards that represent the current state of the organization for managers for instance, a sales manager could see outstanding sales calls for each salesperson, sales margins for products, and profit projections for the quarter. We use the open source charting product JFreeChart to develop charts for portlets in 14.
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Content Management and Portlets
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In 15, we discuss two standards for communicating with content management systems: the Java Content Repository API and the WebDAV protocol. We create a portlet that uses the WebDAV protocol to integrate with a content management system. In this chapter, we use the open source WebDAV client library from the Apache Slide project to build our portlet.
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Portal projects that use standards are going to be easily portable to new portal containers, and developers can use portlets from third-party vendors to create their portals. Before starting work on the production version of your portal, develop an information architecture from the user s perspective. It should show how the portal is going to look, what it is going to do, and what problems it solves. Start small, with a prototype or deployment to a limited number of users, and build out from there, to ensure that your portal deployment scales.
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NOTE The authors created a web site for this book at www.portalbook.com. We will have interesting articles, sample portlets, and more information about upcoming portal standards and APIs.
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Portlet Basics
WE ARE READY TO START developing our first portlet applications. This chapter contains a quick primer on portlet development, packaging, and deployment descriptors. The open source Apache Pluto portal supports the portlet API, and you will learn how to deploy and run portlets on Pluto. We also cover the programming concepts we use in these first simple portlets, to get you up to speed on developing solutions with portals. If you are familiar with servlet development, the details of portlet development will be pretty easy. The authors of the portlet specification purposely made portlets similar to servlets so that developers would not have to stretch too far to learn the new API. The hard part of portlet development is design and architecture for the portal and its portlets instead of working on one Java 2 Enterprise Edition (J2EE) application, multiple applications need to be integrated into a portal. For developers who are not familiar with JavaServer Pages (JSP), we recommend Beginning JSP 2: From Novice to Professional (Apress, May 2004). We use JSP and JSP tags for our portlet applications, so some experience with those is useful. If you have not used the servlet API, you do not need to know it to do portlet development, or to understand our examples. The portlets in this chapter will be portable to any JSR 168 compliant portal server. Portlet deployment is going to vary based on your portal vendor s provided tools some may pick up portlet applications from a directory, others may need a command-line tool, and some may use a web-based GUI to allow remote deployment and administration. In any case, the concepts used for development are the same. We are going to use the terms portlet, portlet application, portlet container, and portal in this chapter. Portlets are individual classes that process requests from a user and return content for display inside a portal. Portlet applications are standard J2EE web applications that include portlet classes and the portlet.xml portlet deployment descriptor. The portlet container is part of a portal, and it instantiates and executes the portlet classes. Portals aggregate the output of one or more portals into a portal page, which is served to a user. When the user selects a link or submits a form on the portal page, the portal processes the request and then sends requests to all of the portlets on the page. We explain more about portlet request handling in this chapter, so don t worry if this seems a little confusing now.
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