org.springframework.web.servlet.i18n

Class LocaleChangeInterceptor

java.lang.Object

org.springframework.web.servlet.i18n.LocaleChangeInterceptor

All Implemented Interfaces:

HandlerInterceptor

public class LocaleChangeInterceptor
extends Object
implements HandlerInterceptor

Interceptor that allows for changing the current locale on every request, via a configurable request parameter (default parameter name: "locale").

Since:

20.06.2003

Author:

Juergen Hoeller, Rossen Stoyanchev

See Also:

LocaleResolver

Field Summary

Fields

Modifier and Type	Field and Description
static String	DEFAULT_PARAM_NAME Default name of the locale specification parameter: "locale".
protected Log	logger

Constructor Summary

Constructors

Constructor and Description
LocaleChangeInterceptor()

Method Summary

Modifier and Type	Method and Description
String[]	getHttpMethods() Return the configured HTTP methods.
String	getParamName() Return the name of the parameter that contains a locale specification in a locale change request.
boolean	isIgnoreInvalidLocale() Return whether to ignore an invalid value for the locale parameter.
boolean	isLanguageTagCompliant() Deprecated. as of 5.1 since it always returns true now
protected Locale	parseLocaleValue(String localeValue) Parse the given locale value as coming from a request parameter.
boolean	preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) Intercept the execution of a handler.
void	setHttpMethods(String... httpMethods) Configure the HTTP method(s) over which the locale can be changed.
void	setIgnoreInvalidLocale(boolean ignoreInvalidLocale) Set whether to ignore an invalid value for the locale parameter.
void	setLanguageTagCompliant(boolean languageTagCompliant) Deprecated. as of 5.1 since it only accepts true now
void	setParamName(String paramName) Set the name of the parameter that contains a locale specification in a locale change request.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.springframework.web.servlet.HandlerInterceptor

afterCompletion, postHandle

Field Detail

DEFAULT_PARAM_NAME

public static final String DEFAULT_PARAM_NAME

Default name of the locale specification parameter: "locale".

See Also:

Constant Field Values

logger

protected final Log logger

Constructor Detail

LocaleChangeInterceptor

public LocaleChangeInterceptor()

Method Detail

setParamName

public void setParamName(String paramName)

Set the name of the parameter that contains a locale specification in a locale change request. Default is "locale".

getParamName

public String getParamName()

Return the name of the parameter that contains a locale specification in a locale change request.

setHttpMethods

public void setHttpMethods(@Nullable
                           String... httpMethods)

Configure the HTTP method(s) over which the locale can be changed.

Parameters:

httpMethods - the methods

Since:

4.2

getHttpMethods

@Nullable
public String[] getHttpMethods()

Return the configured HTTP methods.

Since:

4.2

setIgnoreInvalidLocale

public void setIgnoreInvalidLocale(boolean ignoreInvalidLocale)

Set whether to ignore an invalid value for the locale parameter.

Since:

4.2.2

isIgnoreInvalidLocale

public boolean isIgnoreInvalidLocale()

Return whether to ignore an invalid value for the locale parameter.

Since:

4.2.2

setLanguageTagCompliant

@Deprecated
public void setLanguageTagCompliant(boolean languageTagCompliant)

Deprecated. as of 5.1 since it only accepts true now

Specify whether to parse request parameter values as BCP 47 language tags instead of Java's legacy locale specification format.

NOTE: As of 5.1, this resolver leniently accepts the legacy Locale.toString() format as well as BCP 47 language tags.

Since:

4.3

See Also:

Locale.forLanguageTag(String), Locale.toLanguageTag()

isLanguageTagCompliant

@Deprecated
public boolean isLanguageTagCompliant()

Deprecated. as of 5.1 since it always returns true now

Return whether to use BCP 47 language tags instead of Java's legacy locale specification format.

Since:

4.3

preHandle

public boolean preHandle(HttpServletRequest request,
                         HttpServletResponse response,
                         Object handler)
                  throws ServletException

Description copied from interface: HandlerInterceptor

Intercept the execution of a handler. Called after HandlerMapping determined an appropriate handler object, but before HandlerAdapter invokes the handler.

DispatcherServlet processes a handler in an execution chain, consisting of any number of interceptors, with the handler itself at the end. With this method, each interceptor can decide to abort the execution chain, typically sending an HTTP error or writing a custom response.

Note: special considerations apply for asynchronous request processing. For more details see AsyncHandlerInterceptor.

The default implementation returns true.

Specified by:

preHandle in interface HandlerInterceptor

Parameters:

request - current HTTP request

response - current HTTP response

handler - chosen handler to execute, for type and/or instance evaluation

Returns:

true if the execution chain should proceed with the next interceptor or the handler itself. Else, DispatcherServlet assumes that this interceptor has already dealt with the response itself.

Throws:

ServletException

parseLocaleValue

@Nullable
protected Locale parseLocaleValue(String localeValue)

Parse the given locale value as coming from a request parameter.

The default implementation calls StringUtils.parseLocale(String), accepting the Locale.toString() format as well as BCP 47 language tags.

Parameters:

localeValue - the locale value to parse

Returns:

the corresponding Locale instance

Since:

4.3