The Definitive Guide to Spring Web Flow by Erwin Vervaet

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By Erwin Vervaet

Spring internet movement is a thrilling open resource framework for constructing Java net purposes. The framework improves productiveness by means of addressing 3 significant pain–points dealing with net program builders: person interface navigation keep watch over, nation administration, and modularity.

The Definitive consultant to Spring net Flow covers Spring net circulate intimately via explaining its motivation and have set, in addition to delivering sensible counsel for utilizing the framework to boost net functions effectively in a few environments.

What you’ll learn

  • How to start with Spring internet circulation
  • Leveraging Spring net Flow’s robust positive aspects
  • Extending the framework to take it past its out–of–the–box characteristic set
  • Best practices and real–world use situations
  • Insights into the layout and implementation of the framework
    • Who is that this ebook for?

      This publication is for Java–based net builders trying to construct internet functions utilizing Spring internet platform. it's also for these seeking to combine different Java internet frameworks and purposes with Spring.

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Extra info for The Definitive Guide to Spring Web Flow

Sample text

State Management Complex conversations within web applications not only mandate a controlled navigation but also involve state management. These subjects are often intertwined: a user accumulates state while progressing through the navigational flow prescribed by a particular business process. When the browser’s navigational facilities are used, the application needs to handle the possible impact on the data associated with the conversation: • When using the Back button, should the application undo (or forget) the edits already done on later pages, or should that information be retained for reuse when the user progresses again?

Several of these actions could also be combined into a single larger action, for instance, a Struts DispatchAction controller. method=shippingInfo. 17 18 CHAPTER 1 ■ INTRODUCING SPRING WEB FLOW The end result is that the client drives the progression of the business process, triggering the next step by sending a request targeted at the next controller in the flow. Controllers will have to contain special code to verify that a malicious client is not trying to short-circuit the flow or complete the steps out of order.

Spring Web Flow’s FlowController will use the parameter value to trigger a transition in the hello-flow. • A parameter called _flowExecutionKey, with a value obtained using the ${flowExecutionKey} JSP expression language (EL) expression. As will be explained in the next chapters, every request coming into an active flow execution needs to have a _flowExecutionKey parameter. The value of this parameter is used by Spring Web Flow to determine the conversation you are prticipating in.

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