Configuring a View Resolver in Java

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Listing 6-10. Configuring a View Resolver
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<bean id="viewResolver" class="org.springframework.web.servlet.view.UrlBasedViewResolver"> <property name="prefix" value="/WEB-INF/jsp/"/> <property name="suffix" value=".jsp"/> <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/> </bean> This configuration is pretty much self-explanatory. The resolver class is declared (autowiring is used to identify the view resolver, so actually the id attribute is redundant
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here). The view name is prefixed with /WEB-INF/jsp/, and then suffixed with .jsp, and the JstlView class is then used to render the file in question. As you ll have anticipated, this takes the resulting path (/WEB-INF/jsp/admin/listUser.jsp) and forwards the incoming request as a servlet invocation of this JSP page. It is good practice when using a UrlBasedViewResolver with JSPs to place the files in question under the WEB-INF hierarchy so that they cannot be viewed directly by clients browsing the site (files under WEB-INF cannot be accessed by external requests). The body of the page used to render the resulting forwarded request is then shown in Listing 6-11.
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Listing 6-11. The JSP Used to Render the admin/listUser View
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<body> <h1>Administration</h1> <div id="commands"> <h2>Commands</h2> <a href="${ctx}/">Home</a> <a href="${ctx}/admin/create _flowId=createUser-flow"> Add New User </a> </div> <div id="userList"> <h2>Users</h2> <c:forEach var="user" items="${users}"> <div id="user"> <a href="${ctx}/admin/view/${user.accountName}"> ${user.accountName} </a> </div> </c:forEach> </div> </body> The users attribute (a list of UserAccount objects) was added to the request attribute via the reference data in Listing 6-9. Expression language and the standard tag library are then used to iterate over these objects, rendering a set of links to the appropriate functionality to view the account details in question.
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Validation
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When forms are submitted, we usually want to make sure that their content makes sense in the context of the code that will process the form. There are essentially two ways to validate a form: we can write browser-side JavaScript logic to check that the form has the correct values in it, or we can write server-side logic to check the contents of the request. The JavaScript approach is pretty much optional. It has the advantage of relieving the server of some of the burden of form submissions, and it is quick, but it presents no hard guarantees. The user may have disabled JavaScript validation, and malicious or ingenious users may submit forms without using a browser implementation at all. The server-side approach is therefore essential, and Spring allows us to carry out convenient validation in several places. The first opportunity for validation is the binding of the incoming HTTP request data to the form bean s fields. Generally, this will be carried out automatically; the default PropertyEditor classes will be used to convert incoming request data (by definition submitted as HTTP strings) into appropriate object values. If a form field containing nonnumeric characters is submitted for a field that will be bound to an Integer form property, the error will be caught, and the form will be re-presented to the user. The validation may also take place through custom logic in the controller. Suitable versions of the onBind or onBindAndValidate methods (those providing a BindException parameter) can be overridden for custom error handling. If the custom logic populates the provided BindException object with error information, the framework treats the form as invalid and re-presents the form to the user. However, the validation usually takes place in either the onSubmit method s implementation body (again, a version accepting a BindException object is overridden) or in an external validator-implementing bean provided to the form. Listing 6-12 shows the validator implementation. The interface requires us to override only two methods. The first allows the framework to determine whether the validator should be applied to the form bean in question. The second carries out the validation logic.
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Listing 6-12. A Validator Implementation
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public class PeriodCreateValidator implements Validator { public boolean supports(final Class type) { return PeriodCreateForm.class.equals(type); } public void validate(final Object command, final Errors errors) { final PeriodCreateForm form = (PeriodCreateForm)command; if(form.getNote() == null || "".equals(form.getNote().trim())) { errors.rejectValue("note", "create.period.note"); }
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