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can any body tell about the filter in servlet

 
vijayakumar durai
Ranch Hand
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hi all i want the concept of filter what is filter? why we are using filter what is the advantages in filter?

thanks in advance
 
Paul Sturrock
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Here is a good summary of what they are and why you might use them.
 
Goutham Pallipati
Greenhorn
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Hi,

filters are again Servlets which are used to do some filtering and preprocessing before the actual servlet or resource is invoked.


A filter can be configured for single resource or multiple resource.

One best example for filters is Authentication.

If you want to authenticate a set of resource under http://<server>/myres/
earlier without filters you need to check session validity in each and every resource say servlet or JSP.

Now with filters you can configure a filter and check the session validity in the filter and then the request is automatically redirected to the corresponding resource. The user would not even know that filter exists .
 
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