java.lang.Object
- org.springframework.web.filter.GenericFilterBean
- - org.springframework.web.filter.OncePerRequestFilter
  - - org.springframework.web.filter.CharacterEncodingFilter

All Implemented Interfaces:
Filter, Aware, BeanNameAware, DisposableBean, InitializingBean, EnvironmentAware, EnvironmentCapable, ServletContextAware
```
public class CharacterEncodingFilter
extends OncePerRequestFilter
```
Servlet 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 (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

Constructors
Constructor	Description
`CharacterEncodingFilter()`	Create a default `CharacterEncodingFilter`, with the encoding to be set via `setEncoding(java.lang.String)`.
`CharacterEncodingFilter(String encoding)`	Create a `CharacterEncodingFilter` for the given encoding.
`CharacterEncodingFilter(String encoding, boolean forceEncoding)`	Create a `CharacterEncodingFilter` for the given encoding.
`CharacterEncodingFilter(String encoding, boolean forceRequestEncoding, boolean forceResponseEncoding)`	Create a `CharacterEncodingFilter` for the given encoding.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected void`	`doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)`	Same contract as for `doFilter`, but guaranteed to be just invoked once per request within a single request thread.
`String`	`getEncoding()`	Return the configured encoding for requests and/or responses.
`boolean`	`isForceRequestEncoding()`	Return whether the encoding should be forced on requests
`boolean`	`isForceResponseEncoding()`	Return whether the encoding should be forced on responses.
`void`	`setEncoding(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.
`void`	`setForceRequestEncoding(boolean forceRequestEncoding)`	Set whether the configured `encoding` of this filter is supposed to override existing request encodings.
`void`	`setForceResponseEncoding(boolean forceResponseEncoding)`	Set whether the configured `encoding` of this filter is supposed to override existing response encodings.

Methods inherited from class org.springframework.web.filter.OncePerRequestFilter
doFilter, getAlreadyFilteredAttributeName, isAsyncDispatch, isAsyncStarted, shouldNotFilter, shouldNotFilterAsyncDispatch, shouldNotFilterErrorDispatch

Methods inherited from class org.springframework.web.filter.GenericFilterBean
addRequiredProperty, afterPropertiesSet, createEnvironment, destroy, getEnvironment, getFilterConfig, getFilterName, getServletContext, init, initBeanWrapper, initFilterBean, setBeanName, setEnvironment, setServletContext

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - CharacterEncodingFilter
```
public CharacterEncodingFilter()
```
    Create a default CharacterEncodingFilter, with the encoding to be set via setEncoding(java.lang.String).
    See Also:
    setEncoding(java.lang.String)
  - CharacterEncodingFilter
```
public CharacterEncodingFilter(String encoding)
```
    Create a CharacterEncodingFilter for the given encoding.
    Parameters:
    encoding - the encoding to apply
    Since:
    4.2.3
    See Also:
    setEncoding(java.lang.String)
  - CharacterEncodingFilter
```
public CharacterEncodingFilter(String encoding,
                               boolean forceEncoding)
```
    Create a CharacterEncodingFilter for the given encoding.
    Parameters:
    encoding - the encoding to apply
    forceEncoding - whether the specified encoding is supposed to override existing request and response encodings
    Since:
    4.2.3
    See Also:
    setEncoding(java.lang.String), setForceEncoding(boolean)
  - CharacterEncodingFilter
```
public CharacterEncodingFilter(String encoding,
                               boolean forceRequestEncoding,
                               boolean forceResponseEncoding)
```
    Create a CharacterEncodingFilter for the given encoding.
    Parameters:
    encoding - the encoding to apply
    forceRequestEncoding - whether the specified encoding is supposed to override existing request encodings
    forceResponseEncoding - whether the specified encoding is supposed to override existing response encodings
    Since:
    4.3
    See Also:
    setEncoding(java.lang.String), setForceRequestEncoding(boolean), setForceResponseEncoding(boolean)
- Method Detail
  - setEncoding
```
public void setEncoding(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.
  - getEncoding
```
public String getEncoding()
```
    Return the configured encoding for requests and/or responses.
    Since:
    4.3
  - 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.
    This is the equivalent to setting both setForceRequestEncoding(boolean) and setForceResponseEncoding(boolean).
    See Also:
    setForceRequestEncoding(boolean), setForceResponseEncoding(boolean)
  - setForceRequestEncoding
```
public void setForceRequestEncoding(boolean forceRequestEncoding)
```
    Set whether the configured encoding of this filter is supposed to override existing request 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.
    Since:
    4.3
  - isForceRequestEncoding
```
public boolean isForceRequestEncoding()
```
    Return whether the encoding should be forced on requests
    Since:
    4.3
  - setForceResponseEncoding
```
public void setForceResponseEncoding(boolean forceResponseEncoding)
```
    Set whether the configured encoding of this filter is supposed to override existing response encodings.
    Default is "false", i.e. do not modify the encoding. Switch this to "true" to enforce the specified encoding for responses in any case.
    Since:
    4.3
  - isForceResponseEncoding
```
public boolean isForceResponseEncoding()
```
    Return whether the encoding should be forced on responses.
    Since:
    4.3
  - doFilterInternal
```
protected void doFilterInternal(HttpServletRequest request,
                                HttpServletResponse response,
                                FilterChain filterChain)
                         throws ServletException,
                                IOException
```
    Description copied from class: OncePerRequestFilter
    Same contract as for doFilter, but guaranteed to be just invoked once per request within a single request thread. See OncePerRequestFilter.shouldNotFilterAsyncDispatch() for details.
    Provides HttpServletRequest and HttpServletResponse arguments instead of the default ServletRequest and ServletResponse ones.
    Specified by:
    doFilterInternal in class OncePerRequestFilter
    Throws:
    ServletException
    IOException

Class CharacterEncodingFilter

Field Summary

Fields inherited from class org.springframework.web.filter.OncePerRequestFilter

Fields inherited from class org.springframework.web.filter.GenericFilterBean

Constructor Summary

Method Summary

Methods inherited from class org.springframework.web.filter.OncePerRequestFilter

Methods inherited from class org.springframework.web.filter.GenericFilterBean

Methods inherited from class java.lang.Object

Constructor Detail

CharacterEncodingFilter

CharacterEncodingFilter

CharacterEncodingFilter

CharacterEncodingFilter

Method Detail

setEncoding

getEncoding

setForceEncoding

setForceRequestEncoding

isForceRequestEncoding

setForceResponseEncoding

isForceResponseEncoding

doFilterInternal