J2EE Patterns

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Top level enterprise blueprints http://java.sun.com/blueprints/enterprise/index.html

Catalogue of patters http://java.sun.com/blueprints/patterns/catalog.html

Intercepting Filter

Problem

Interpret and manipulate request before/after processing

Actions/Control based on input
Transformations

Examples:

Compression/Encryption/Encoding
Validating session/browser type/URL access

Solution:

Standard filter strategy
Pluggable filter
Filter manager - combines chain of filters - delegates control

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