javax.servlet
Interface Filter

All Known Subinterfaces:

CometFilter

All Known Implementing Classes:

AmberContextFilter, AnonymousExpiresFilter, CsrfFilter, ErrorFilter, ErrorPageFilter, ExpiresFilter, GzipFilter, HeaderFilter, MD5Filter, PasswordFilter, ProfilerFilter, SSIFilter, ThrottleFilter, TransactionFilter, XsltFilter

public interface Filter

Filters the request or response to a servlet. Filters will typically call the next filter in the chain, eventually reaching the servlet at the bottom.

Since:

Servlet 2.3

Method Summary

void	destroy() Cleanup the filter.
void	doFilter(ServletRequest request, ServletResponse response, FilterChain chain) doFilter performs the actual work of a filter, either modifying the request or the response.
void	init(FilterConfig filterConfig) Initialize the filter.

Method Detail

init

void init(FilterConfig filterConfig)
          throws ServletException

Initialize the filter.

Throws:

ServletException

doFilter

void doFilter(ServletRequest request,
              ServletResponse response,
              FilterChain chain)
              throws ServletException,
                     java.io.IOException

doFilter performs the actual work of a filter, either modifying the request or the response. It will typically call the chain.doFilter() to invoke the next filter in the chain.

Parameters:

request - the servlet request

response - the servlet response

chain - the next filter in the chain

Throws:

ServletException

java.io.IOException

destroy

void destroy()

Cleanup the filter.