本文探讨了HTTP Filters的功能及如何通过修改请求和响应来增强Web应用。此外，还介绍了Request Dispatcher的作用，即如何实现请求转发及包含其他资源输出。
Filter:
A filter is a reusable piece of code that can transform the content of HTTP requests,
responses, and header information. Filters do not generally create a response or
respond to a request as servlets do, rather they modify or adapt the requests for a
resource, and modify or adapt responses from a resource.
Dispatcher:
When building a Web application, it is often useful to forward processing of a
request to another servlet, or to include the output of another servlet in the response.
The RequestDispatcher interface provides a mechanism to accomplish this.
A filter is a reusable piece of code that can transform the content of HTTP requests,
responses, and header information. Filters do not generally create a response or
respond to a request as servlets do, rather they modify or adapt the requests for a
resource, and modify or adapt responses from a resource.
Dispatcher:
When building a Web application, it is often useful to forward processing of a
request to another servlet, or to include the output of another servlet in the response.
The RequestDispatcher interface provides a mechanism to accomplish this.
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