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can any body tell about the filter in servlet

vijayakumar durai
Ranch Hand

Joined: Aug 18, 2008
Posts: 153
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
Bartender

Joined: Apr 14, 2004
Posts: 10336

Here is a good summary of what they are and why you might use them.


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Goutham Pallipati
Greenhorn

Joined: Aug 13, 2008
Posts: 20
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 .
 
I agree. Here's the link: http://aspose.com/file-tools
 
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