By J Neal Ford
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Extra resources for Art of Java web development
Our sample uses a homegrown connection pool class called DbPool, which offers rudimentary database connection pooling. The source for it is trivial and is available as part of the source code archive, but won’t be shown here for space considerations. The init() method handles two jobs: getting the init parameters from the servlet context and adding the connection pool to the application context. xml file as global init parameters. This is a common practice because it allows the developer to change such characteristics as the driver class and login information without having to recompile the application.
Maintaining comment synchronization is error-prone, so let the code speak for itself. Use method, variable, class, and interface names that don't need comments to convey their purpose. It is also likely that more code will accrue over time, making the public method longer. Any candidate for a nice cohesive method should be extracted. The code is consequently much more readable. The display of the catalog occurs next. 10. 10 displayCatalog() shows the entire catalog of products. toString()); } At first glance, it would seem that this method would be much more complex.
You must police the design and architecture at every opportunity (especially early in the development cycle) to ensure that you don’t end up with an application that looks partitioned but that is, in reality, a mess of misplaced code. In chapter 2, we look at creating web applications through the eyes of a developer who understands the web API s but has no experience building wellarchitected applications. It covers design and architecture when you’re using servlets and JSP without the benefits of design patterns or other best practices.