filters
Class ExampleFilter

java.lang.Object
  filters.ExampleFilter

All Implemented Interfaces:

Filter

public final class ExampleFilter
extends Object
implements Filter

Example filter that can be attached to either an individual servlet or to a URL pattern. This filter performs the following functions:

• Attaches itself as a request attribute, under the attribute name defined by the value of the attribute initialization parameter.
• Calculates the number of milliseconds required to perform the servlet processing required by this request, including any subsequently defined filters, and logs the result to the servlet context log for this application.

Author:

Craig McClanahan

Constructor Summary

ExampleFilter()

Method Summary

void	destroy() Take this filter out of service.
void	doFilter(ServletRequest request, ServletResponse response, FilterChain chain) Time the processing that is performed by all subsequent filters in the current filter stack, including the ultimately invoked servlet.
void	init(FilterConfig filterConfig) Place this filter into service.
String	toString() Return a String representation of this object.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

ExampleFilter

public ExampleFilter()

Method Detail

destroy

public void destroy()

Take this filter out of service.

Specified by:

destroy in interface Filter

doFilter

public void doFilter(ServletRequest request,
                     ServletResponse response,
                     FilterChain chain)
              throws IOException,
                     ServletException

Time the processing that is performed by all subsequent filters in the current filter stack, including the ultimately invoked servlet.

Specified by:

doFilter in interface Filter

Parameters:

request - The servlet request we are processing

result - The servlet response we are creating

chain - The filter chain we are processing

Throws:

IOException - if an input/output error occurs

ServletException - if a servlet error occurs

init

public void init(FilterConfig filterConfig)
          throws ServletException

Place this filter into service.

Specified by:

init in interface Filter

Parameters:

filterConfig - The filter configuration object

Throws:

ServletException

toString

public String toString()

Return a String representation of this object.

Overrides:

toString in class Object