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Extra resources for Beginning Java EE 5
Applet Client with JSP and Database Figure 1-16 shows an architecture similar to the one shown in Figure 1-15. In this case, the client is a Java applet that resides entirely in the presentation tier and communicates with the business layer. Although the business layer could be an EJB, as in the previous example, in this example, the business layer is constructed from JSPs. Figure 1-16. An applet in the presentation layer can communicate over the network with JSPs (or Servlets) in the business layer.
N-tier applications can be designed to be secure. The Java EE architecture is based on the notion of n-tier applications. Java EE makes it very easy to build industrial-strength applications based on two, three, or more application layers, and provides all of the plumbing and wiring to make that possible. book Page 9 Saturday, October 1, 2005 6:14 AM CHAPTER 1 ■ JAVA EE ESSENTIALS Note that n-tier architecture does not demand that each of the application layers run on a separate machine. It’s certainly possible to write n-tier applications that execute on a standalone machine, as you’ll see.
The game cartridge needs to be concerned only with itself; it doesn’t need to concern itself with how the game is displayed to the user, what sort of controller is being used, or even if the household electricity is 120VAC or 220VAC. The console provides a container that abstracts all of that stuff out for the game, allowing the game programmer to focus solely on the game and not worry about the infrastructure. book Page 12 Saturday, October 1, 2005 6:14 AM 12 CHAPTER 1 ■ JAVA EE ESSENTIALS Figure 1-6.