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CHAPTER 4 JUMP INTO SPRING MVC
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The constructor is used to declaratively configure the class, defining the command bean, the command name, and the view names for the form work flow. setCommandName() defines the name of the command bean, when referenced by the view page. You will see this name referenced with the <spring:nestedPath> tag in the JSP in Listing 4-8, defining the bean to be used for the entire XHTML form. setCommandClass() defines the class to be used for the command bean. This can be any POJO with getters and setters, and it can include both simple and complex types for properties. setFormView() defines the logical name for the view used when initially viewing the form. This view will also be displayed if validation fails, so that the user can correct any mistakes. Remember that this view name is resolved to an actual View instance via the ViewResolver. setSuccessView() defines the logical name for the view to display when form submission finished correctly. This view will receive the objects from the model when form processing is complete.
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Note You may choose to define these properties in the bean definition XML file when you declare the
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Controller. However, because these configurations are fairly static, we recommend the constructor as a
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better place to set the properties. Anything to keep the amount of XML to a minimum is usually helpful.
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Notice that what you don t see in the code is any special handling to display the form itself. The SimpleFormController handles the initial HTTP GET request and displays the initial form view. Most of the time, you will concern yourself only with handling the form submission. Just like with the HomeController, this Controller delegates the real work of the form submission to the service layer. We see that this Controller includes the setFlightService() method so that the ApplicationContext can inject this dependency. The initBinder() method is a life cycle callback method provided so that you may register any custom PropertyEditors required for your command bean. Because the SearchFlights bean has properties of type java.util.Date, we need to create an instance of CustomDateEditor with the allowed date format. The registerCustomEditor() method essentially says, Whenever you see a property of type Date.class, use this CustomDateEditor to convert the String from the request parameter into an instance of Date.class.
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Note Spring, out of the box, is configured with many different PropertyEditors to support many of the basic types, such as ints, booleans, and arrays of Strings. These PropertyEditors you do not need to register. You are required to register an editor only if it requires specific information in order to function, as is the case here with a custom date format.
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CHAPTER 4 JUMP INTO SPRING MVC
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The real action happens inside onSubmit(), the life cycle callback for handling the command bean when the form is submitted. If this method is called, it is assumed that the bean was successfully created, populated with values from the form, and validated correctly. By now you can assume that the command bean is ready to be processed. The onSubmit() method should delegate to the service layer, as we are doing here with the call to findFlights(). It also is responsible for generating the ModelAndView object, to be used when rendering the success view. As you can see, we are including the search results and the original command bean into the model, so that we can display the matching flights and the original search criteria. With the matching flights located and included in the model, the success view will be rendered.
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SearchFlightsController Configuration
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Like we did for HomeController, the SearchFlightsController will be defined inside the spring-servlet.xml and thus the WebApplicationContext. We will also map this controller to the URI /search, which will be used for both viewing the search form and handling the form submission. Refer to Listing 4-17. Listing 4-17. spring-servlet.xml Additions for SearchFlightsController <bean name="/search" class="com.apress.expertspringmvc.flight.web.SearchFlightsController"> <property name="flightService" ref="flightService" /> </bean> No other configuration is required, for the environment was previously configured for the first use case.
Summary
The SearchFlightsController is a basic implementation of the SimpleFormController. It leaves nearly all of the work flow up to the superclass, implementing only the onSubmit() method to process the command bean. The processing is simply delegated to the service layer, creating a clean separation of concerns. As seen in the constructor, a SimpleFormController requires two Views, one for the initial form view, containing the XHTML form, and one for the success view, rendered after a successful form submission. Let s look at both of these JSP pages now.
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