Package org.springframework.web.servlet.i18n

Class CookieLocaleResolver

java.lang.Object

org.springframework.web.util.CookieGenerator

org.springframework.web.servlet.i18n.CookieLocaleResolver

All Implemented Interfaces:

LocaleContextResolver, LocaleResolver

public class CookieLocaleResolver
extends CookieGenerator
implements LocaleContextResolver

LocaleResolver implementation that uses a cookie sent back to the user in case of a custom setting, with a fallback to the configured default locale, the request's Accept-Language header, or the default locale for the server.

This is particularly useful for stateless applications without user sessions. The cookie may optionally contain an associated time zone value as well; alternatively, you may specify a default time zone.

Custom controllers can override the user's locale and time zone by calling #setLocale(Context) on the resolver, e.g. responding to a locale change request. As a more convenient alternative, consider using RequestContext.changeLocale(java.util.Locale).

Since:

27.02.2003

Author:

Juergen Hoeller, Jean-Pierre Pawlak, Vedran Pavic, Sam Brannen

See Also:

• setDefaultLocale(java.util.Locale)
• setDefaultTimeZone(java.util.TimeZone)

Field Summary

Fields

Modifier and Type	Field	Description
static final String	DEFAULT_COOKIE_NAME	The default cookie name used if none is explicitly set.
static final String	LOCALE_REQUEST_ATTRIBUTE_NAME	The name of the request attribute that holds the Locale.
static final String	TIME_ZONE_REQUEST_ATTRIBUTE_NAME	The name of the request attribute that holds the TimeZone.

Fields inherited from class org.springframework.web.util.CookieGenerator

DEFAULT_COOKIE_PATH, logger

Constructor Summary

Constructors

Constructor	Description
CookieLocaleResolver()	Create a new instance of CookieLocaleResolver using the default cookie name.

Method Summary

Modifier and Type	Method	Description
protected Locale	determineDefaultLocale(HttpServletRequest request)	Deprecated. as of 6.0, in favor of setDefaultLocaleFunction(Function)
protected TimeZone	determineDefaultTimeZone(HttpServletRequest request)	Deprecated. as of 6.0, in favor of setDefaultTimeZoneFunction(Function)
protected Locale	getDefaultLocale()	Return the fixed locale that this resolver will return if no cookie is found, if any.
protected TimeZone	getDefaultTimeZone()	Return the fixed time zone that this resolver will return if no cookie is found, if any.
boolean	isLanguageTagCompliant()	Return whether this resolver's cookies should be compliant with BCP 47 language tags instead of Java's legacy locale specification format.
boolean	isRejectInvalidCookies()	Return whether to reject cookies with invalid content (e.g.
protected Locale	parseLocaleValue(String localeValue)	Parse the given locale value coming from an incoming cookie.
Locale	resolveLocale(HttpServletRequest request)	Default implementation of LocaleResolver.resolveLocale(HttpServletRequest) that delegates to LocaleContextResolver.resolveLocaleContext(HttpServletRequest), falling back to ServletRequest.getLocale() if necessary.
LocaleContext	resolveLocaleContext(HttpServletRequest request)	Resolve the current locale context via the given request.
void	setDefaultLocale(Locale defaultLocale)	Set a fixed locale that this resolver will return if no cookie is found.
void	setDefaultLocaleFunction(Function<HttpServletRequest,Locale> defaultLocaleFunction)	Set the function used to determine the default locale for the given request, called if no locale cookie has been found.
void	setDefaultTimeZone(TimeZone defaultTimeZone)	Set a fixed time zone that this resolver will return if no cookie is found.
void	setDefaultTimeZoneFunction(Function<HttpServletRequest,TimeZone> defaultTimeZoneFunction)	Set the function used to determine the default time zone for the given request, called if no locale cookie has been found.
void	setLanguageTagCompliant(boolean languageTagCompliant)	Specify whether this resolver's cookies should be compliant with BCP 47 language tags instead of Java's legacy locale specification format.
void	setLocale(HttpServletRequest request, HttpServletResponse response, Locale locale)	Default implementation of LocaleResolver.setLocale(HttpServletRequest, HttpServletResponse, Locale) that delegates to LocaleContextResolver.setLocaleContext(HttpServletRequest, HttpServletResponse, LocaleContext), using a SimpleLocaleContext.
void	setLocaleContext(HttpServletRequest request, HttpServletResponse response, LocaleContext localeContext)	Set the current locale context to the given one, potentially including a locale with associated time zone information.
void	setRejectInvalidCookies(boolean rejectInvalidCookies)	Specify whether to reject cookies with invalid content (e.g.
protected String	toLocaleValue(Locale locale)	Render the given locale as a text value for inclusion in a cookie.

Methods inherited from class org.springframework.web.util.CookieGenerator

addCookie, createCookie, getCookieDomain, getCookieMaxAge, getCookieName, getCookiePath, isCookieHttpOnly, isCookieSecure, removeCookie, setCookieDomain, setCookieHttpOnly, setCookieMaxAge, setCookieName, setCookiePath, setCookieSecure

Methods inherited from class java.lang.Object

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

Field Details

LOCALE_REQUEST_ATTRIBUTE_NAME

public static final String LOCALE_REQUEST_ATTRIBUTE_NAME

The name of the request attribute that holds the Locale.

Only used for overriding a cookie value if the locale has been changed in the course of the current request!

Use RequestContext(Utils).getLocale() to retrieve the current locale in controllers or views.

See Also:

• RequestContext.getLocale()
• RequestContextUtils.getLocale(jakarta.servlet.http.HttpServletRequest)

TIME_ZONE_REQUEST_ATTRIBUTE_NAME

public static final String TIME_ZONE_REQUEST_ATTRIBUTE_NAME

The name of the request attribute that holds the TimeZone.

Only used for overriding a cookie value if the locale has been changed in the course of the current request!

Use RequestContext(Utils).getTimeZone() to retrieve the current time zone in controllers or views.

See Also:

• RequestContext.getTimeZone()
• RequestContextUtils.getTimeZone(jakarta.servlet.http.HttpServletRequest)

DEFAULT_COOKIE_NAME

public static final String DEFAULT_COOKIE_NAME

The default cookie name used if none is explicitly set.

Constructor Details

CookieLocaleResolver

public CookieLocaleResolver()

Create a new instance of CookieLocaleResolver using the default cookie name.

Method Details

setLanguageTagCompliant

public void setLanguageTagCompliant(boolean languageTagCompliant)

Specify whether this resolver's cookies should be compliant with BCP 47 language tags instead of Java's legacy locale specification format.

The default is true, as of 5.1. Switch this to false for rendering Java's legacy locale specification format. For parsing, this resolver leniently accepts the legacy Locale.toString() format as well as BCP 47 language tags in any case.

Since:

4.3

See Also:

• parseLocaleValue(String)
• toLocaleValue(Locale)
• Locale.forLanguageTag(String)
• Locale.toLanguageTag()

isLanguageTagCompliant

public boolean isLanguageTagCompliant()

Return whether this resolver's cookies should be compliant with BCP 47 language tags instead of Java's legacy locale specification format.

Since:

4.3

setRejectInvalidCookies

public void setRejectInvalidCookies(boolean rejectInvalidCookies)

Specify whether to reject cookies with invalid content (e.g. invalid format).

The default is true. Turn this off for lenient handling of parse failures, falling back to the default locale and time zone in such a case.

Since:

5.1.7

See Also:

• setDefaultLocale(java.util.Locale)
• setDefaultTimeZone(java.util.TimeZone)
• setDefaultLocaleFunction(Function)
• setDefaultTimeZoneFunction(Function)

isRejectInvalidCookies

public boolean isRejectInvalidCookies()

Return whether to reject cookies with invalid content (e.g. invalid format).

Since:

5.1.7

setDefaultLocale

public void setDefaultLocale(@Nullable
 Locale defaultLocale)

Set a fixed locale that this resolver will return if no cookie is found.

getDefaultLocale

@Nullable
protected Locale getDefaultLocale()

Return the fixed locale that this resolver will return if no cookie is found, if any.

setDefaultTimeZone

public void setDefaultTimeZone(@Nullable
 TimeZone defaultTimeZone)

Set a fixed time zone that this resolver will return if no cookie is found.

Since:

4.0

getDefaultTimeZone

@Nullable
protected TimeZone getDefaultTimeZone()

Return the fixed time zone that this resolver will return if no cookie is found, if any.

Since:

4.0

setDefaultLocaleFunction

public void setDefaultLocaleFunction(Function<HttpServletRequest,Locale> defaultLocaleFunction)

Set the function used to determine the default locale for the given request, called if no locale cookie has been found.

The default implementation returns the configured default locale, if any, and otherwise falls back to the request's Accept-Language header locale or the default locale for the server.

Parameters:

defaultLocaleFunction - the function used to determine the default locale

Since:

6.0

See Also:

• setDefaultLocale(java.util.Locale)
• ServletRequest.getLocale()

setDefaultTimeZoneFunction

public void setDefaultTimeZoneFunction(Function<HttpServletRequest,TimeZone> defaultTimeZoneFunction)

Set the function used to determine the default time zone for the given request, called if no locale cookie has been found.

The default implementation returns the configured default time zone, if any, or null otherwise.

Parameters:

defaultTimeZoneFunction - the function used to determine the default time zone

Since:

6.0

See Also:

• setDefaultTimeZone(java.util.TimeZone)

resolveLocale

public Locale resolveLocale(HttpServletRequest request)

Description copied from interface: LocaleContextResolver

Default implementation of LocaleResolver.resolveLocale(HttpServletRequest) that delegates to LocaleContextResolver.resolveLocaleContext(HttpServletRequest), falling back to ServletRequest.getLocale() if necessary.

Specified by:

resolveLocale in interface LocaleContextResolver

Specified by:

resolveLocale in interface LocaleResolver

Parameters:

request - the request to resolve the locale for

Returns:

the current locale (never null)

resolveLocaleContext

public LocaleContext resolveLocaleContext(HttpServletRequest request)

Description copied from interface: LocaleContextResolver

Resolve the current locale context via the given request.

This is primarily intended for framework-level processing; consider using RequestContextUtils or RequestContext for application-level access to the current locale and/or time zone.

The returned context may be a TimeZoneAwareLocaleContext, containing a locale with associated time zone information. Simply apply an instanceof check and downcast accordingly.

Custom resolver implementations may also return extra settings in the returned context, which again can be accessed through downcasting.

Specified by:

resolveLocaleContext in interface LocaleContextResolver

Parameters:

request - the request to resolve the locale context for

Returns:

the current locale context (never null

See Also:

• LocaleContextResolver.resolveLocale(HttpServletRequest)
• RequestContextUtils.getLocale(jakarta.servlet.http.HttpServletRequest)
• RequestContextUtils.getTimeZone(jakarta.servlet.http.HttpServletRequest)

setLocale

public void setLocale(HttpServletRequest request,
 @Nullable
 HttpServletResponse response,
 @Nullable
 Locale locale)

Description copied from interface: LocaleContextResolver

Default implementation of LocaleResolver.setLocale(HttpServletRequest, HttpServletResponse, Locale) that delegates to LocaleContextResolver.setLocaleContext(HttpServletRequest, HttpServletResponse, LocaleContext), using a SimpleLocaleContext.

Specified by:

setLocale in interface LocaleContextResolver

Specified by:

setLocale in interface LocaleResolver

Parameters:

request - the request to be used for locale modification

response - the response to be used for locale modification

locale - the new locale, or null to clear the locale

setLocaleContext

public void setLocaleContext(HttpServletRequest request,
 @Nullable
 HttpServletResponse response,
 @Nullable
 LocaleContext localeContext)

Description copied from interface: LocaleContextResolver

Set the current locale context to the given one, potentially including a locale with associated time zone information.

Specified by:

setLocaleContext in interface LocaleContextResolver

Parameters:

request - the request to be used for locale modification

response - the response to be used for locale modification

localeContext - the new locale context, or null to clear the locale

See Also:

• LocaleContextResolver.setLocale(HttpServletRequest, HttpServletResponse, Locale)
• SimpleLocaleContext
• SimpleTimeZoneAwareLocaleContext

parseLocaleValue

@Nullable
protected Locale parseLocaleValue(String localeValue)

Parse the given locale value coming from an incoming cookie.

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

See Also:

• StringUtils.parseLocale(String)

toLocaleValue

protected String toLocaleValue(Locale locale)

Render the given locale as a text value for inclusion in a cookie.

The default implementation calls Locale.toString() or Locale.toLanguageTag(), depending on the "languageTagCompliant" configuration property.

Parameters:

locale - the locale to convert to a string

Returns:

a String representation for the given locale

Since:

4.3

See Also:

• isLanguageTagCompliant()

determineDefaultLocale

@Deprecated
protected Locale determineDefaultLocale(HttpServletRequest request)

Deprecated.

as of 6.0, in favor of setDefaultLocaleFunction(Function)

Determine the default locale for the given request, called if no locale cookie has been found.

The default implementation returns the configured default locale, if any, and otherwise falls back to the request's Accept-Language header locale or the default locale for the server.

Parameters:

request - the request to resolve the locale for

Returns:

the default locale (never null)

See Also:

• setDefaultLocale(java.util.Locale)
• ServletRequest.getLocale()

determineDefaultTimeZone

@Deprecated
@Nullable
protected TimeZone determineDefaultTimeZone(HttpServletRequest request)

Deprecated.

as of 6.0, in favor of setDefaultTimeZoneFunction(Function)

Determine the default time zone for the given request, called if no locale cookie has been found.

The default implementation returns the configured default time zone, if any, or null otherwise.

Parameters:

request - the request to resolve the time zone for

Returns:

the default time zone (or null if none defined)

See Also:

• setDefaultTimeZone(java.util.TimeZone)