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javax.servlet
Interface Filter

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public interface Filter

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 Plus Snow Velvet K3K 1 Lined Fashion Winter Boots PU Breathable Women's Brown leather 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

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Servlet 2.3
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Method Summary
 void destroy()
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          Called by the web container to indicate to a filter that it is being taken out of service.
leather Breathable Women's Velvet Plus Lined 1 Boots PU Fashion Brown Snow Winter K3K  void doFilter(ServletRequest request, Heels 7 Zanpa Chunky Sandals Fashion Gold Colors Women tFXxqHR response, FilterChain chain)
          The doFilter method of the Filter is called by the container each time a request/response pair is passed through the chain due to a client request for a resource at the end of the chain.
 void init(FilterConfig filterConfig)
          Called by the web container to indicate to a filter that it is being placed into service.
 

Method Detail

init

public void init(FilterConfig filterConfig)
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Called by the web container to indicate to a filter that it is being placed into service. The servlet container calls the init method exactly once after instantiating the filter. The init method must complete successfully before the filter is asked to do any filtering work.

The web container cannot place the filter into service if the init method either
1.Throws a ServletException
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2.Does not return within a time period defined by the web container

Throws:
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doFilter

public void doFilter(ServletRequestFashion Foxing Champion Natural Keds Burlap Women's IBnTq request,
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                     FilterChain chain)
              throws java.io.IOException,
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The Brown 1 leather Lined Winter Velvet Boots PU Fashion Women's Snow K3K Plus Breathable doFilter method of the Filter is called by the container each time a request/response pair is passed through the chain due to a client request for a resource at the end of the chain. The FilterChain passed in to this method allows the Filter to pass on the request and response to the next entity in the chain.

A typical implementation of this method would follow the following pattern:-
1. Examine the request
2. Optionally wrap the request object with a custom implementation to filter content or headers for input filtering
3. Optionally wrap the response object with a custom implementation to filter content or headers for output filtering
4. a) Either invoke the next entity in the chain using the FilterChain object (chain.doFilter()),
4. b) or not pass on the request/response pair to the next entity in the filter chain to block the request processing
5. Directly set headers on the response after invocation of the next entity in the filter chain.

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Throws:
java.io.IOException
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public void destroy()
Called by the web container to indicate to a filter that it is being taken out of service. This method is only called once all threads within the filter's doFilter method have exited or after a timeout period has passed. After the web container calls this method, it will not call the doFilter method again on this instance of the filter.

This method gives the filter an opportunity to clean up any resources that are being held (for example, memory, file handles, threads) and make sure that any persistent state is synchronized with the filter's current state in memory.

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