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The Controllers we ve mentioned up to this point provide stateless request handling, with no explicit features for a multipage work flow. However, there are many situations that call for an ordered and consistent user experience that spans multiple pages. For instance, the work flow for creating a new account might take two pages, with the first page checking for username and email uniqueness and the second page accepting billing details. Only after the user completes both pages, and no validation errors exist, will the system create the account. These multistep use cases, commonly called wizards, require complex state management for the user experience. To help with this problem, we will use the org.springframework.web. servlet.mvc.AbstractWizardFormController, a specialized Controller providing the basic infrastructure for multiple form work flows. You should think of this Controller as a SimpleFormController that has spread its form across multiple pages.
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Explore the SimpleFormController before attempting to use AbstractWizardFormController, Tip
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as the two controllers treat forms in a similar manner.
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CHAPTER 6 THE CONTROLLER MENAGERIE
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The AbstractWizardFormController has some limitations that are important to understand before you begin to use it. The Controller really only supports simple multipage work flows that are essentially a single form spread across multiple pages. This Controller was not designed to support arbitrary decision branching, and in no way can it handle a generic state machine. For that, you should turn to Spring Web Flow, covered later in this book. With Spring Web Flow, you can declaratively create arbitrarily complex work flows, allowing the user to travel back and forth through the state machine. To summarize, use AbstractWizardFormController when you want to split what otherwise would have been a long form into multiple pages. Also, use the AbstractWizardFormController only when you are populating a single command bean across multiple pages. For anything more complex Spring Web Flow is your solution.
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AbstractWizardFormController is for work flows with strict page progression. Use this controller only for splitting a single form across multiple pages.
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State Changes
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This controller supports three different types of state changes: Page change: moving from one page to another, either backward (in the event of validation errors, for instance) or forward on success. Cancel: exiting the wizard in mid work flow, typically clearing the state of the wizard. This state change is optional. Finish: formally completing the work flow. This is the end state for the wizard. By default, the Controller knows which state to enter by examining different well-known request parameters. You may change the heuristics for detecting a state change by overriding the appropriate method (see Table 6-3). Table 6-3. Wizard State Change
State
Page Cancel Finish
Default Parameter
_targetXXX, where XXX equals the number of the next page view _cancel _finish
Override Method
getTargetPage() isCancelRequest() isFinishRequest()
These parameters are normally included as hidden XHTML elements in the form. Each form submission should contain only one of the above parameters. Their values don t matter; only the existence of the parameter is enough to trigger the state change.
CHAPTER 6 THE CONTROLLER MENAGERIE
Each form can also specify which page it is in the work flow by including a _pageXXX request parameter. By default, the wizard tracks the current page in the HTTP session, but to correctly support the back button, your form should include the _pageXXX parameter. Just like with _targetXXX, replace XXX with the number of the current page. Listing 6-63 says that the current form represents the first page, and the user should be directed to the second page on a successful form submission. Listing 6-63. Declaring Current Page and Next Page Numbers <input type="hidden" name="_page0" value="true" /> <input type="hidden" name="_target1" value="true" /> It is easy to argue that giving the client the responsibility for specifying the target page is a security concern. For instance, it is easy to specify any target on a form submission. When precise control over page progression is required, implement the getTargetPage() method to perform the correct heuristics for target page determination. If you do this, be sure to take into account support for the Back button of the client s browser. In other words, don t base your decision for the target page solely on information in the session, which isn t necessarily updated when the user clicks the Back button. We keep talking about page numbers, but what do they represent The wizard is configured with a set of view names, or page names, generally in the order that they should be presented to the user. The page number is the index into the array of view names.
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