Wicket in Action - download pdf or read online


By Martijn Dashorst

ISBN-10: 1932394982

ISBN-13: 9781932394986

There are dozens of Java frameworks available in the market, yet so much of them require you to benefit particular coding recommendations and new, frequently inflexible, styles of improvement. Wicket is various. As a component-based net software framework, Wicket helps you to construct maintainable enterprise-grade net functions utilizing the facility of undeniable previous Java items (POJOs), HTML, Ajax, Spring, Hibernate and Maven. Wicket immediately manages nation on the part point, this means that not more awkward HTTPSession gadgets. Its stylish programming version permits you to write wealthy net purposes quick.

Wicket in motion is an authoritative, complete consultant for Java builders construction Wicket-based internet functions. This publication begins with an creation to Wicket's constitution and parts, and strikes quick into examples of Wicket at paintings. Written via of the project's earliest and such a lot authoritative specialists, this booklet exhibits you either the "how-to" and the "why" of Wicket. As you progress in the course of the booklet, you are going to discover ways to use and customise Wicket elements, the right way to engage with different applied sciences like Spring and Hibernate, and the way to construct wealthy, Ajax-driven positive factors into your applications.

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It’s immediately clear what information can be stored in the session at any given time. Note in this example, the methods are synchronized, because sessions aren’t thread-safe (more on that later this chapter). get()). When using Wicket, you typically never need to deal with the raw HttpServletRequest or Response objects; this holds true even when you’re dealing with custom sessions. SESSIONSTORE The session store is responsible for where, when, and how long session data is kept. servlet API) and stores older pages to a temporary store (by default a temporary directory) for Back button support.

As mentioned earlier, the processing of this step is delegated to the request target, because that target has the best knowledge of how the response should be created. Introducing Wicket components NOTE 31 When runtime exceptions occur, a special variant of the response step is executed. A page-request target takes care of rendering a page and sending it to the client, a resource-request target locates a resource (an image, for instance) and streams it to the client, and an Ajax request target renders individual components and generates an XML response that the client Ajax library understands.

The Application class is responsible for the instantiation of most objects. When you follow an object-oriented design approach, you typically translate concepts to classes. In Wicket, the Application, Session, and Request classes—or rather, their object instances—play a central role in request processing. 2 shows these classes together with others that are directly related. Let’s take a closer look at each class. APPLICATION Conceptually, the Application object is the top-level container that bundles all components, markup and properties files, and configuration.

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Wicket in Action by Martijn Dashorst

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