Servlet Filter Tutorial Theory смотреть онлайн

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A filter is an object that performs filtering tasks on either the request to a resource (a servlet or static content), or on the response from a resource, or both.

Filters perform filtering in the doFilter method.
Every Filter has access to a FilterConfig object from which it can obtain its initialization parameters, a reference to the ServletContext which it can use, for example, to load resources needed for filtering tasks.

Filters are configured in the deployment descriptor of a web application

Examples that have been identified for this design are
1) Authentication Filters
2) Logging and Auditing Filters
3) Image conversion Filters
4) Data compression Filters
5) Encryption Filters
6) Tokenizing Filters
7) Filters that trigger resource access events
8) XSL/T filters
9) Mime-type chain Filter

In this video we will see :
- Filters in servlet
- What is filter in servlet
- Why we need servlet filter
- What is Filterchain
- How to create filter
- init()
- doFilter()
- destroy()
- Configuring Filter
- FilterConfig()

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