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Extra info for Java 2 Enterprise Edition (J2EE) Web Component Developer Exam Cram 2 (Exam Cram 310-080)

Sample text

The container invokes the listener method and passes it information (methods in the HttpSessionListener interface are passed an HttpSessionEvent) about that event. removeAttribute(“StartDate”); When this executes, it triggers the attribute listener. ServletContextListener. ➤ contextDestroyed(ServletContextEvent sce). Notification that the servlet context is about to be shut down. ➤ contextInitialized(ServletContextEvent sce). Notification that the Web application is ready to process requests.

Web Applications A Web application is a collection of servlets, JSP pages, HTML documents, and other Web resources (such as image files, compressed archives, and other data). This collection might be packaged into an archive or exist as separate files in an open directory structure. Because you have many servlet classes, JSP pages, HTML pages, and other supporting libraries and files for a given Web application, there are many complicated dependencies. war extension that contains all the components of a Web application.

Servlet . . Methods . . and . Life . Cycle . . will include the text as is. The following code snippet demonstrates how one servlet can transfer the request to another servlet. forward(request, response); You can also include content from a static page or another servlet. include(request, response); Notice that the included servlet cannot set headers. The servlet cannot change the response status code, either (if you try, it will be ignored). The best way to send along information from the calling servlet to the called servlet is to use a query string or, even better, to use the setAttribute method to set request object attributes where they are easy to access.

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