J2EE Pattern

Front Controller Pattern

Creational patterns Structural patterns Behavioral pattern J2EE patterns Abstract Factory Adapter  Chain of Responsibility MVC  Builder Bridge  Command  Business Delegate Factory method Composite  Interpreter  Composite Entity Prototype Decorator  Iterator  Data Access Object Singleton Façade Mediator  Front Controller Flyweight  Memento  Intercepting Filter Proxy  Observer  Service Locator State  Transfer Object Strategy  Template Method Visitor

Front Controller

Define Front controller pattern

Using a single component to process application requests.

Where to use & benefits

JSP or Servlet. Design request handling component. Channel all requests through a single controller. Centralize request processing and view selection. Reduce business logic in a view Improve manageability of security Promote code reuse across requests Avoid code duplication Related patterns include Command combined with multiple requests. Intercepting Filter both centralize control of certain types of request processing. Page Controller -- an alternative way.

Example front controller pattern

Design a servlet to deal with all the requests.  (Just like struts controller)