Download PDF by Marty Hall: More Servlets and JavaServer Pages

By Marty Hall

ISBN-10: 0130676144

ISBN-13: 9780130676146

Sensible advisor to using the Java 2 Platform for Web-enabled purposes and dynamic sites. specializes in new features: the traditional JSP tag library, filters, life-cycle occasion listeners, declarative and programmatic protection, net functions, and lots more and plenty extra. Softcover

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Download e-book for iPad: More Servlets and JavaServer Pages by Marty Hall

Sensible advisor to using the Java 2 Platform for Web-enabled purposes and dynamic websites. specializes in new services: the normal JSP tag library, filters, life-cycle occasion listeners, declarative and programmatic safety, internet purposes, and lots more and plenty extra. Softcover

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In practice, however, this use of servlets has not caught on, and I’ll only be discussing HTTP servlets. 1 The Advantages of Servlets Over “Traditional” CGI Java servlets are more efficient, easier to use, more powerful, more portable, safer, and cheaper than traditional CGI and many alternative CGI-like technologies. Efficient With traditional CGI, a new process is started for each HTTP request. If the CGI program itself is relatively short, the overhead of starting the process can dominate the execution time.

Web-app> The service Method Each time the server receives a request for a servlet, the server spawns a new thread (perhaps by reusing an idle Thread from a thread pool) and calls service. , as appropriate. A GET request results from a normal request for a URL or from an HTML form that has no METHOD specified. A POST request results from an HTML form that specifically lists POST as the METHOD. Other HTTP requests are generated only by custom clients. com). Now, if you have a servlet that needs to handle both POST and GET requests identically, you may be tempted to override service directly rather than implementing both doGet and doPost.

The second step in writing a servlet that builds an HTML document is to have your println statements output HTML, not plain text. 7 to verify that the server is func-tioning properly. As Figure 2-3 illustrates, the browser formats the result as HTML, not as plain text. Figure 2-3. setContentType("text/html"); HelloServlet. println(docType + "\n" + "Hello\n" + "\n" + "


\n" + ""); } } Servlet Packaging In a production environment, multiple programmers can be developing servlets for the same server.

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More Servlets and JavaServer Pages by Marty Hall

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