Filter interface

public interface Filter {
    public void init(FilterConfig filterConfig) throws ServletException;
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException;
    public void destroy();
}

If you want to define a filter to your application, then you must implement this interface.

Filters perform filtering in the doFilter method. Every Filter has access to a FilterConfig object from which it can obtain its initialization parameters, and a reference to the ServletContext.

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