System Administration

Beginning Apache Struts: From Novice to Professional by Arnold Doray

By Arnold Doray

Starting Apache Struts will offer you a operating wisdom of Apache Struts 1.2. This publication is perfect for you Java programmers who've a few JSP familiarity, yet very little past adventure with Servlet expertise. geared up in a condensed instructional and lab structure, the fabric during this e-book has been verified in actual school room environments. It takes a step by step, hands-on method of educating you Struts. The ebook even previews the following iteration of Struts, the Apache Shale. the final result's so that you can speedy observe Struts for your paintings settings with self assurance.

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The function getString() returns your custom tag’s body (assuming it has one) as a String. You can get an instance of BodyContent, if you’ve subclassed BodyTagSupport, by calling the function that has been implemented for you on the base class BodyTagSupport. BodyContent also gives a Writer instance with which you can write the output of your tag’s transformed body. JSPWriter. ” to be displayed in the given font color—red, in this instance. A Java handler to accomplish this is shown in Listing 4-4.

Discussion As in Requirement 2, we obviously need Controller code to run the validation. Unlike Requirement 2, a client-side validation is less feasible, because we might need to check with a database in order to find out if the given user ID exists. This also implies we need Model code to read user IDs off the database. The Model code has a function like this: public boolean exists(String userid) to run the user ID check. Our Controller code would use this function to run the validation. Requirement 4 If at any stage there is an error, the user is presented with the same start page, with an appropriate error message (see Figure 5-3).

Session and request scopes are the most often used scopes. • Session-scoped variables exist for the duration of a user’s session with the system. • Request-scoped variables exist only for a single-page request, including redirects. • Session-scoped variables are stored in an instance of HttpSession. • Request-scoped variables are stored in an instance of HttpServletRequest. • HttpServletRequest and HttpSession can be used to pass data between Java classes and JSPs. fm Page 23 Monday, December 12, 2005 3:47 PM CHAPTER 4 ■■■ Custom Tags C ustom tags are JSP tags you create that allow you to define new functionality for your JSPs.

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