Core Servlets And Java Server Pages by Marty Hall, Larry Brown PDF

By Marty Hall, Larry Brown

ISBN-10: 3827269547

ISBN-13: 9783827269546

Applicable for all intermediate-to-advanced classes in server-side improvement with Java Servlets and/or JavaServer Pages, this version covers the Servlet 2.4 specification, starting with server configuration, uncomplicated syntax, the servlet lifecycle, shape facts, HTTP 1.1, cookies, and consultation monitoring, and makes a speciality of JSP 2.0, and extra.

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Personal use only; do not redistribute. 7 An Example Using Initialization Parameters in languages (such as ones named after letters of the alphabet) where it is easy to read or write off the ends of arrays, make illegal typecasts, or have dangling pointers due to memory reclamation errors. Besides, even Java technology won’t prevent someone from tripping over the power cable running to the computer. So, don’t count on destroy as the only mechanism for saving state to disk. Activities like hit counting or accumulating lists of cookie values that indicate special access should also proactively write their state to disk periodically.

Init call. init on the first line. The service Method Each time the server receives a request for a servlet, the server spawns a new thread and calls service. , as appropriate. Now, if you have a servlet that needs to handle both POST and GET requests identically, you may be tempted to override service directly as below, rather than implementing both doGet and doPost. public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // Servlet Code } This is not a good idea.

43 © Prentice Hall and Sun Microsystems. Personal use only; do not redistribute. 44 Chapter 2 First Servlets Figure 2–7 Server. 11 shows a servlet that uses init to do two things. First, it builds an array of 10 integers. Since these numbers are based upon complex calculations, I don’t want to repeat the computation for each request. So I have doGet look up the values that init computed instead of generating them each time. The results of this technique are shown in Figure 2–8. However, since all users get the same result, init also stores a page modification date that is used by the getLastModified method.

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Core Servlets And Java Server Pages by Marty Hall, Larry Brown

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