September 2003
Intermediate to advanced
368 pages
10h 16m
English
Content preview from J2EE Design Patterns
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Server-Side Presentation Tier
Most developers think of a web browser as the presentation layer of J2EE. But the web browser isn’t the whole story. J2EE supports many ways for users to connect: web browser, WAP-enabled phone, or web service, to name a few. These mechanisms have two things in common:
They have a client-server model.
The clients, such as web browsers and cell phones, share the work of generating a presentation with a server. The server holds the server-side presentation tier, which typically generates marked-up data like HTML or XML. The client interprets the marked-up data and presents it to the user.
They are request-based.
When the user wants to do anything, the client initiates a request to the server, and then waits for a response. The server processes the request and generates the appropriate response.
Enterprise developers usually don’t have control over the client. Concentrate on what we can control: the server-side presentation tier. Figure 3-1 shows a typical setup for a server-side presentation tier in a web-based environment. The server is like a hotel’s front desk, waiting for clients to call with questions (in the form of HTTP requests). The web server acts like a highly caffeinated receptionist, answering basic questions itself and directing complex requests to other interfaces—like the concierge or the plumber.
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Figure 3-1. Components of the server-side presentation ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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