org.apache.catalina.filters
Class SetCharacterEncodingFilter

java.lang.Object
  org.apache.catalina.filters.SetCharacterEncodingFilter

All Implemented Interfaces:

javax.servlet.Filter

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 "false".

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.

Field Summary

protected static StringManager

sm

Constructor Summary

SetCharacterEncodingFilter()

Method Summary

void	destroy()
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.
java.lang.String	getEncoding()
void	init(javax.servlet.FilterConfig filterConfig)
boolean	isIgnore()
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.
void	setEncoding(java.lang.String encoding)
void	setIgnore(boolean ignore)

Methods inherited from class java.lang.Object

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

Field Detail

sm

protected static final StringManager sm

Constructor Detail

SetCharacterEncodingFilter

public SetCharacterEncodingFilter()

Method Detail

setEncoding

public void setEncoding(java.lang.String encoding)

getEncoding

public java.lang.String getEncoding()

setIgnore

public void setIgnore(boolean ignore)

isIgnore

public boolean isIgnore()

init

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

Specified by:

init in interface javax.servlet.Filter

Throws:

javax.servlet.ServletException

destroy

public void destroy()

Specified by:

destroy in interface javax.servlet.Filter

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

Parameters:

request - The servlet request we are processing

response - The servlet response we are creating

chain - The filter chain we are processing

Throws:

java.io.IOException - if an input/output error occurs

javax.servlet.ServletException - if a servlet error occurs

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.

Parameters:

request - The servlet request we are processing