FILTERING REQUESTS AND RESPONSES in Java

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FILTERING REQUESTS AND RESPONSES
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There are many ways for a filter to modify a request or response For example, a filter could add an attribute to the request or insert data in the response In the inserts the value of the counter Duke s Bookstore example, into the response A filter that modifies a response must usually capture the response before it is returned to the client The way to do this is to pass a stand-in stream to the servlet that generates the response The stand-in stream prevents the servlet from closing the original response stream when it completes and allows the filter to modify the servlet s response To pass this stand-in stream to the servlet, the filter creates a response wrapper that overrides the or method to return this stand-in stream The wrapper is passed to the method of the filter chain Wrapper methods default to calling through to the wrapped request or response object This approach follows the well-known Wrapper or Decorator pattern described in Design Patterns: Elements of Reusable Object-Oriented Software (Addison-Wesley, 1995) The following sections describe how the hit counter filter described earlier and other types of filters use wrappers To override request methods, you wrap the request in an object that extends or To override response methods, you wrap the response in an object that extends or wraps the response in a The wrapped response is passed to the next object in the filter chain, which is writes its response into the stream created by When returns, retrieves the servlet s response from and writes it to a buffer The
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filter inserts the value of the counter into the buffer, resets the content length header of the response, and finally writes the contents of the buffer to the response stream
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