Filters
In this section, we'll see how a filter chain is constructed to handle an incoming request.
A FilterDef represents the<filter> element in the web application deployment descriptor. It describes a filter in terms of its name, its implementation class, and initialization parameters.
A FilterMap, on the other hand, represents the<filter-mapping> element. This element describes the servlet names, URL patterns, and dispatcher mappings that cause the filter to be engaged.
A FilterMap instance defines when a filter will be invoked. By default, a filter is invoked for incoming requests. However, you can specify that a filter should be invoked even ...
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