本文探讨了前端控制器模式的核心概念及其在处理系统请求中的作用。详细介绍了控制器作为初始接触点的功能，如何集中处理展示层请求，并通过分发或直接转发请求到业务逻辑层或视图层来避免代码重复。
Front controller
1. The controller is the initilal contact point for handling all the requests in system,
2. The controller actually is a centralized access point for presentation tier request handling, if the user access the view(like jsp files) without going through a centralized point. it may lead to problems, that the each view is required to provide its own system services, resulting in duplicate code.for example: in thr front controller,
2.1.we can dispatch the request to delegate tier to handle special business logic,
2.2.we can directly forward the request to view tier
1. The controller is the initilal contact point for handling all the requests in system,
2. The controller actually is a centralized access point for presentation tier request handling, if the user access the view(like jsp files) without going through a centralized point. it may lead to problems, that the each view is required to provide its own system services, resulting in duplicate code.for example: in thr front controller,
2.1.we can dispatch the request to delegate tier to handle special business logic,
2.2.we can directly forward the request to view tier
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