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Listing 6-28. The Form Elements from previewUser.jsp
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<form:form> <form:errors cssClass="errors" path="username"/> <label>Username: ${command.username}</label> <form:hidden path="username"/> <input type="submit" name="_eventId_edit" value="Cancel"/> <input type="submit" name="_eventId_save" value="Save User"/> </form:form> The custom tags used to render parts of these forms are discussed in more detail in the Tag Libraries section later in this chapter.
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In Spring MVC and Spring Web Flow, forms are handled by converting their string representations to and from the properties of a POJO. This POJO is referred to as the command object. The fields of the command object are populated by the controller when a form is submitted. When the form is initially rendered, a command object may be populated by the controller from the incoming request parameters and supplied to the page; this is the behavior when you set the bindOnNewForm attribute in AbstractFormController and its derived classes. The same form bean may be used by multiple controllers, or by multiple steps in a single controller as, for example, with classes derived from AbstractWizardFormController. If the controller is permitted to use the HttpSession object, maintaining the content of the command object between actions is relatively simple. However, session objects come with their own problems. If you intend to operate without the session, you must ensure that any fields of the command object that are not currently editable or visible in the forms are rendered as hidden HTML form fields so that they are available to reconstruct the command object upon form submission. In addition to the problem of maintaining the content of a command object for controllers spanning multiple form submissions, there is the problem of managing collections of objects. The collection classes are not well suited to the representation of fields in the command object because they have no associated type information at runtime. Even if using Java generics, a List<String> will be converted to a plain List at runtime by a process known
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CH A PT ER 6 WEB APPLIC AT IO NS
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as erasure. This means that there is no information available to Spring s PropertyEditors to determine the type that associated form fields should be converted to. Your alternatives are to add additional manual binding of these properties upon form submission, or to use Java array types where a collection class might otherwise have been more suitable.
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Earlier in this chapter, you saw how a view resolver could be used by Spring MVC and Spring Web Flow to convert Spring MVC view names into the concrete implementation of a JSP. Your application is not restricted to using JSPs, however. Spring supports a wide range of view technologies, and it uses the same basic mechanism for all of them: you configure a view resolver for the appropriate output format, and establish how view names are mapped to their output.
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Velocity and FreeMarker
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Velocity and FreeMarker are templating languages with similar behavior and syntaxes. In some ways they are like JSPs, but unlike JSPs they are interpreted dynamically rather than being compiled by the application server into class files. A common beginners error with JSPs is to try to include lots of application logic in the page, when it really belongs in a servlet or some other controller class. Velocity and FreeMarker intentionally restrict the amount of logic that can easily be included in the page to those operations that are concerned with the presentation of the data supplied to it. In both cases, the syntax has a lot in common with the Java EE expression language used to dynamically incorporate content into JSPs. Velocity templates are defined in files. Our first step when configuring velocity is therefore to define the location from which the files will be loaded. Listing 6-29 shows the configuration of Spring s VelocityConfigurer to define the appropriate path. The velocity configurer is one of a set of wrapper and helper classes used to make the Velocity libraries more IOC friendly.
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