Beginning Apache Struts: From Novice to Professional by Arnold Doray

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By Arnold Doray

Starting Apache Struts will offer you a operating wisdom of Apache Struts 1.2. This e-book is perfect for you Java programmers who've a few JSP familiarity, yet very little earlier adventure with Servlet know-how. equipped in a condensed instructional and lab structure, the cloth during this ebook has been established in actual school room environments. It takes a step by step, hands-on method of educating you Struts. The booklet even previews the subsequent iteration of Struts, the Apache Shale. the final result's that you should speedy follow Struts on your paintings settings with self assurance.

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Listed in decreasing lifetimes, they are as follows: • Application scope: Application-scoped variables are visible to every page of the web application, all the time. The variable is visible to all users of the system and exists across multiple user sessions. In other words, different users can potentially view and change the same variable at any time and from any page. • Session scope: Session-scoped variables exist only for a single-user session, but they are visible to every page in that session.

Both classes have setAttribute() and getAttribute() functions (see Appendix B for details) to store and retrieve objects on them, very much like a HashMap’s put() and get() functions. Objects stored on HttpServletRequest have request scope while objects stored on HttpSession have session scope. When you create a variable on your JSP page, as in Listing 3-1, you’re implicitly calling setAttribute() on the appropriate object (an instance of either HttpServletRequest or HttpSession) depending on the scope you used.

Figure 2-4 illustrates the most used functions on these two classes. Figure 2-4. HttpServletRequest and HttpSession Note that you can obtain an instance of HttpSession from HttpRequestServlet using the latter’s getSession() function. The important functions on both classes are also listed in Appendix B. fm Page 13 Tuesday, January 24, 2006 2:09 PM CHAPTER 2 ■ SERVLET AND JSP REVIEW JavaServer Pages (JSP) Earlier, I mentioned that servlets are Java classes that generate an appropriate response to an HTTP request.

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