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Each <div> is a label or a form field, styled with the CSS class label or input. The JSF input text component that renders an HTML input field. The identifier is useful to bind it to error-message output, the size defines the visual size of the input field, and user input is required when this form is submitted. The most interesting part is the value binding of the input field to a backing bean (named itemEditor) and a getter/setter method pair (named getItemId()/setItemId()) on that backing bean. This is the data model this input field is bound to, and JSF synchronizes changes automatically. JSF also supports input validation and comes with a range of built-in validators. Here you declare that user input can t be negative (item identifiers are positive integers). The submit button of the form has an action binding to the method doSearch() of the backing bean named itemEditor. What happens after the action executes depends on the outcome of that method. This is how the page looks rendered in the browser (figure 17.1).

To complete this chapter, you must have a computer that meets the minimum hardware requirements listed in the preface, About This Book. You must also have Microsoft Windows XP Professional installed on a computer on which you can make changes.

17-1

J 1)

17-2

17

If you look at the URL, you see that the page has been called with the suffix .jsf; you probably expected to see search.xhtml. The .jsf suffix is a servlet mapping; the JSF servlet runs whenever you call a URL that ends in .jsf, and after installation of Facelets, you configured it in web.xml to use .xhtml internally. In other words, the search.xhtml page is rendered by the JSF servlet. If you click the Search button without entering a search value, an error message is shown on the page. This also happens if you try to enter a noninteger or nonpositive integer value, and it s all handled by JSF automatically. If you enter a valid item identifier value, and the backing bean finds the item in the database, you re forwarded to the item-editing screen. (Let s finish the user interface before focusing on the application logic in the backing bean.) Writing the edit page The edit page shows the details of the item that has been found in the search and allows the user to edit these details. When the user decides to save his changes, and after all validation is successful, the application shows the search page again. The source code for the edit page is shown in listing 17.3.

Windows XP Professional includes the Shared Folders snap-in, which allows you to easily monitor access to network resources and send administrative messages to users. The Shared Folders snap-in is included in Computer Management, and you can also add the snap-in to your own custom console. You monitor access to network resources to assess and manage current usage on network servers. You monitor access to shared folders to determine how many users currently have a connection to each folder. You can also monitor open files to determine which users are accessing the files, and you can disconnect users from one open file or from all open files.

Identify reasons for monitoring access to network resources Identify which users can monitor access to network resources View and monitor the shared folders on a computer Monitor open files on a computer Disconnect users from one or all open files

<!DOCTYPE html PUBLIC ... <html xmlns= ... <head> ... <body> ... <h2>Editing item: #{itemEditor.itemId}</h2> <h:form> <span class="errors"><h:messages/></span>

It is important that you understand why you should monitor the network resources in your computer environment. Some of the reasons why it is important to assess and manage network resources are included in the following list: Maintenance You should determine which users are currently using a resource so that you can notify them before making the resource temporarily or permanently unavailable. Additionally, you might be able to detect current or impending problems. Security You should monitor user access to resources that are confidential or need to be secure to verify that only authorized users are accessing them. Planning You should determine which resources are being used and how much they are being used so that you can plan for future system growth. You can use Computer Management to monitor the resources on the local computer or a remote computer.

17-3

mode because distributed cache mode allows BranchCache to function on a branch office network when a Windows Server 2008 R2 server is not located on the branch office LAN.

<div class="entry"> <div class="label">Name:</div> <div class="input"> <h:inputText required="true" size="25" value="#{itemEditor.itemName}"> <f:validateLength minimum="5" maximum="255"/> </h:inputText> </div> </div> <div class="entry"> <div class="label">Description:</div> <div class="input"> <h:inputTextarea cols="40" rows="4" required="true" value="#{itemEditor.itemDescription}"> <f:validateLength minimum="10" maximum="4000"/> </h:inputTextarea> </div> </div> <div class="entry"> <div class="label">Initial price (USD):</div> <div class="input"> <h:inputText size="6" required="true" value="#{itemEditor.itemInitialPrice}" > <f:converter converterId="javax.faces.BigDecimal"/> </h:inputText> </div> </div> <div class="entry"> <div class="label"> </div> <div class="input"> <h:commandButton value="Save" styleClass="button" action="#{itemEditor.doSave}"/> </div> </div>