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org.apache.webapp.admin.filters
Class SetCharacterEncodingFilter  

java.lang.Object
  org.apache.webapp.admin.filters.SetCharacterEncodingFilter

All Implemented Interfaces:

javax.servlet.Filter

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public class SetCharacterEncodingFilter

extends java.lang.Object

implements javax.servlet.Filter

Example filter that sets the character encoding to be used in parsing the incoming request, either unconditionally or only if the client did not specify a character encoding. Configuration of this filter is based on the following initialization parameters:

• encoding - The character encoding to be configured for this request, either conditionally or unconditionally based on the ignore initialization parameter. This parameter is required, so there is no default.
• ignore - If set to "true", any character encoding specified by the client is ignored, and the value returned by the selectEncoding() method is set. If set to "false, selectEncoding() is called only if the client has not already specified an encoding. By default, this parameter is set to "true".

Although this filter can be used unchanged, it is also easy to subclass it and make the selectEncoding() method more intelligent about what encoding to choose, based on characteristics of the incoming request (such as the values of the Accept-Language and User-Agent headers, or a value stashed in the current user's session.

Version:

$Revision: 303019 $ $Date: 2004-07-23 10:02:17 -0400 (Fri, 23 Jul 2004) $

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Field Summary
protected  java.lang.String	encoding           The default character encoding to set for requests that pass through this filter.
protected  javax.servlet.FilterConfig	filterConfig           The filter configuration object we are associated with.
protected  boolean	ignore           Should a character encoding specified by the client be ignored?

 

Constructor Summary

SetCharacterEncodingFilter()

 

Method Summary
void	destroy()           Take this filter out of service.
void	doFilter(javax.servlet.ServletRequest request, javax.servlet.ServletResponse response, javax.servlet.FilterChain chain)           Select and set (if specified) the character encoding to be used to interpret request parameters for this request.
void	init(javax.servlet.FilterConfig filterConfig)           Place this filter into service.
protected  java.lang.String	selectEncoding(javax.servlet.ServletRequest request)           Select an appropriate character encoding to be used, based on the characteristics of the current request and/or filter initialization parameters.

 

Methods inherited from class java.lang.Object

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

 

Field Detail

encoding

protected java.lang.String encoding

The default character encoding to set for requests that pass through this filter.

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filterConfig

protected javax.servlet.FilterConfig filterConfig

The filter configuration object we are associated with. If this value is null, this filter instance is not currently configured.

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ignore

protected boolean ignore

Should a character encoding specified by the client be ignored?

Constructor Detail

SetCharacterEncodingFilter

public SetCharacterEncodingFilter()

Method Detail

destroy

public void destroy()

Take this filter out of service.

Specified by:

destroy in interface javax.servlet.Filter

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doFilter

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

Select and set (if specified) the character encoding to be used to interpret request parameters for this request.

Specified by:

doFilter in interface javax.servlet.Filter

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init

public void init(javax.servlet.FilterConfig filterConfig)
          throws javax.servlet.ServletException

Place this filter into service.

Specified by:

init in interface javax.servlet.Filter

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selectEncoding

protected java.lang.String selectEncoding(javax.servlet.ServletRequest request)

Select an appropriate character encoding to be used, based on the characteristics of the current request and/or filter initialization parameters. If no character encoding should be set, return null.

The default implementation unconditionally returns the value configured by the encoding initialization parameter for this filter.

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