Front Controller

• 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

Design a servlet to deal with all the requests.

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