Package org.springframework.web.servlet.i18n

Class SessionLocaleResolver

java.lang.Object

org.springframework.web.servlet.i18n.AbstractLocaleResolver

org.springframework.web.servlet.i18n.AbstractLocaleContextResolver

org.springframework.web.servlet.i18n.SessionLocaleResolver

All Implemented Interfaces:

LocaleContextResolver, LocaleResolver

public class SessionLocaleResolver
extends AbstractLocaleContextResolver

LocaleResolver implementation that uses a locale attribute in the user's session 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 most appropriate if the application needs user sessions anyway, i.e. when the HttpSession does not have to be created just for storing the user's locale. The session may optionally contain an associated time zone attribute 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, for example, responding to a locale change request. As a more convenient alternative, consider using RequestContext.changeLocale(java.util.Locale).

In contrast to CookieLocaleResolver, this strategy stores locally chosen locale settings in the Servlet container's HttpSession. As a consequence, those settings are just temporary for each session and therefore lost when each session terminates.

Note that there is no direct relationship with external session management mechanisms such as the "Spring Session" project. This LocaleResolver will simply evaluate and modify corresponding HttpSession attributes against the current HttpServletRequest.

Since:

27.02.2003

Author:

Juergen Hoeller, Vedran Pavic

See Also:

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

Field Summary

Fields

Modifier and Type	Field	Description
static final String	LOCALE_SESSION_ATTRIBUTE_NAME	Default name of the session attribute that holds the Locale.
static final String	TIME_ZONE_SESSION_ATTRIBUTE_NAME	Default name of the session attribute that holds the TimeZone.

Constructor Summary

Constructors

Constructor	Description
SessionLocaleResolver()

Method Summary

Modifier and Type	Method	Description
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	setDefaultLocaleFunction(Function<HttpServletRequest,Locale> defaultLocaleFunction)	Set the function used to determine the default locale for the given request, called if no Locale session attribute has been found.
void	setDefaultTimeZoneFunction(Function<HttpServletRequest,@Nullable TimeZone> defaultTimeZoneFunction)	Set the function used to determine the default time zone for the given request, called if no TimeZone session attribute has been found.
void	setLocaleAttributeName(String localeAttributeName)	Specify the name of the corresponding attribute in the HttpSession, holding the current Locale value.
void	setLocaleContext(HttpServletRequest request, @Nullable HttpServletResponse response, @Nullable LocaleContext localeContext)	Set the current locale context to the given one, potentially including a locale with associated time zone information.
void	setTimeZoneAttributeName(String timeZoneAttributeName)	Specify the name of the corresponding attribute in the HttpSession, holding the current TimeZone value.

Methods inherited from class org.springframework.web.servlet.i18n.AbstractLocaleContextResolver

getDefaultTimeZone, setDefaultTimeZone

Methods inherited from class org.springframework.web.servlet.i18n.AbstractLocaleResolver

getDefaultLocale, setDefaultLocale

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.LocaleContextResolver

setLocale

Field Details

LOCALE_SESSION_ATTRIBUTE_NAME

public static final String LOCALE_SESSION_ATTRIBUTE_NAME

Default name of the session attribute that holds the Locale.

Only used internally by this implementation.

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_SESSION_ATTRIBUTE_NAME

public static final String TIME_ZONE_SESSION_ATTRIBUTE_NAME

Default name of the session attribute that holds the TimeZone.

Only used internally by this implementation.

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

See Also:

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

Constructor Details

SessionLocaleResolver

public SessionLocaleResolver()

Method Details

setLocaleAttributeName

public void setLocaleAttributeName(String localeAttributeName)

Specify the name of the corresponding attribute in the HttpSession, holding the current Locale value.

The default is an internal LOCALE_SESSION_ATTRIBUTE_NAME.

Since:

4.3.8

setTimeZoneAttributeName

public void setTimeZoneAttributeName(String timeZoneAttributeName)

Specify the name of the corresponding attribute in the HttpSession, holding the current TimeZone value.

The default is an internal TIME_ZONE_SESSION_ATTRIBUTE_NAME.

Since:

4.3.8

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 session attribute 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:

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

setDefaultTimeZoneFunction

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

Set the function used to determine the default time zone for the given request, called if no TimeZone session attribute 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:

• AbstractLocaleContextResolver.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.

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.

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)

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.

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