org.springframework.web.filter
Class CharacterEncodingFilter

java.lang.Object
  extended by org.springframework.web.filter.GenericFilterBean
      extended by org.springframework.web.filter.OncePerRequestFilter
          extended by org.springframework.web.filter.CharacterEncodingFilter
All Implemented Interfaces:
javax.servlet.Filter, BeanNameAware, DisposableBean, InitializingBean, ServletContextAware

public class CharacterEncodingFilter
extends OncePerRequestFilter

Servlet 2.3/2.4 Filter that allows one to specify a character encoding for requests. This is useful because current browsers typically do not set a character encoding even if specified in the HTML page or form.

This filter can either apply its encoding if the request does not already specify an encoding, or enforce this filter's encoding in any case ("forceEncoding"="true"). In the latter case, the encoding will also be applied as default response encoding on Servlet 2.4+ containers (although this will usually be overridden by a full content type set in the view).

Since:
15.03.2004
Author:
Juergen Hoeller
See Also:
setEncoding(java.lang.String), setForceEncoding(boolean), ServletRequest.setCharacterEncoding(java.lang.String), ServletResponse.setCharacterEncoding(java.lang.String)

Field Summary
 
Fields inherited from class org.springframework.web.filter.OncePerRequestFilter
ALREADY_FILTERED_SUFFIX
 
Fields inherited from class org.springframework.web.filter.GenericFilterBean
logger
 
Constructor Summary
CharacterEncodingFilter()
           
 
Method Summary
protected  void doFilterInternal(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, javax.servlet.FilterChain filterChain)
          Same contract as for doFilter, but guaranteed to be just invoked once per request.
 void setEncoding(java.lang.String encoding)
          Set the encoding to use for requests.
 void setForceEncoding(boolean forceEncoding)
          Set whether the configured encoding of this filter is supposed to override existing request and response encodings.
 
Methods inherited from class org.springframework.web.filter.OncePerRequestFilter
doFilter, getAlreadyFilteredAttributeName, shouldNotFilter
 
Methods inherited from class org.springframework.web.filter.GenericFilterBean
addRequiredProperty, afterPropertiesSet, destroy, getFilterConfig, getFilterName, getServletContext, init, initBeanWrapper, initFilterBean, setBeanName, setServletContext
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

CharacterEncodingFilter

public CharacterEncodingFilter()
Method Detail

setEncoding

public void setEncoding(java.lang.String encoding)
Set the encoding to use for requests. This encoding will be passed into a ServletRequest.setCharacterEncoding(java.lang.String) call.

Whether this encoding will override existing request encodings (and whether it will be applied as default response encoding as well) depends on the "forceEncoding" flag.


setForceEncoding

public void setForceEncoding(boolean forceEncoding)
Set whether the configured encoding of this filter is supposed to override existing request and response encodings.

Default is "false", i.e. do not modify the encoding if ServletRequest.getCharacterEncoding() returns a non-null value. Switch this to "true" to enforce the specified encoding in any case, applying it as default response encoding as well.

Note that the response encoding will only be set on Servlet 2.4+ containers, since Servlet 2.3 did not provide a facility for setting a default response encoding.


doFilterInternal

protected void doFilterInternal(javax.servlet.http.HttpServletRequest request,
                                javax.servlet.http.HttpServletResponse response,
                                javax.servlet.FilterChain filterChain)
                         throws javax.servlet.ServletException,
                                java.io.IOException
Description copied from class: OncePerRequestFilter
Same contract as for doFilter, but guaranteed to be just invoked once per request. Provides HttpServletRequest and HttpServletResponse arguments instead of the default ServletRequest and ServletResponse ones.

Specified by:
doFilterInternal in class OncePerRequestFilter
Throws:
javax.servlet.ServletException
java.io.IOException