本文介绍了在Web应用中常用的两种技术：Filter与Dispatcher。Filter是一种可重用的代码片段，用于转换HTTP请求、响应及头部信息。不同于Servlet直接响应请求，Filter主要修改请求和资源响应。Dispatcher则提供了一种机制来实现请求的转发处理或包含其他Servlet的输出。
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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