org.springframework.web.servlet.support

Class RequestContextUtils

java.lang.Object

org.springframework.web.servlet.support.RequestContextUtils

public abstract class RequestContextUtils
extends Object

Utility class for easy access to request-specific state which has been set by the DispatcherServlet.

Supports lookup of current WebApplicationContext, LocaleResolver, Locale, ThemeResolver, Theme, and MultipartResolver.

Since:

03.03.2003

Author:

Juergen Hoeller, Rossen Stoyanchev

See Also:

RequestContext, DispatcherServlet

Constructor Summary

Constructors

Constructor and Description
RequestContextUtils()

Method Summary

Modifier and Type	Method and Description
static FlashMapManager	getFlashMapManager(HttpServletRequest request) Return the FlashMapManager instance to save flash attributes with before a redirect.
static Map<String,?>	getInputFlashMap(HttpServletRequest request) Return a read-only Map with "input" flash attributes saved on a previous request.
static Locale	getLocale(HttpServletRequest request) Retrieve the current locale from the given request, using the LocaleResolver bound to the request by the DispatcherServlet (if available), falling back to the request's accept-header Locale.
static LocaleResolver	getLocaleResolver(HttpServletRequest request) Return the LocaleResolver that has been bound to the request by the DispatcherServlet.
static FlashMap	getOutputFlashMap(HttpServletRequest request) Return the "output" FlashMap with attributes to save for a subsequent request.
static Theme	getTheme(HttpServletRequest request) Retrieves the current theme from the given request, using the ThemeResolver and ThemeSource bound to the request by the DispatcherServlet.
static ThemeResolver	getThemeResolver(HttpServletRequest request) Return the ThemeResolver that has been bound to the request by the DispatcherServlet.
static ThemeSource	getThemeSource(HttpServletRequest request) Return the ThemeSource that has been bound to the request by the DispatcherServlet.
static TimeZone	getTimeZone(HttpServletRequest request) Retrieve the current time zone from the given request, using the TimeZoneAwareLocaleResolver bound to the request by the DispatcherServlet (if available), falling back to the system's default time zone.
static WebApplicationContext	getWebApplicationContext(ServletRequest request) Look for the WebApplicationContext associated with the DispatcherServlet that has initiated request processing.
static WebApplicationContext	getWebApplicationContext(ServletRequest request, ServletContext servletContext) Look for the WebApplicationContext associated with the DispatcherServlet that has initiated request processing, and for the global context if none was found associated with the current request.

Methods inherited from class java.lang.Object

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

Constructor Detail

RequestContextUtils

public RequestContextUtils()

Method Detail

getWebApplicationContext

public static WebApplicationContext getWebApplicationContext(ServletRequest request)
                                                      throws IllegalStateException

Look for the WebApplicationContext associated with the DispatcherServlet that has initiated request processing.

Parameters:

request - current HTTP request

Returns:

the request-specific web application context

Throws:

IllegalStateException - if no servlet-specific context has been found

getWebApplicationContext

public static WebApplicationContext getWebApplicationContext(ServletRequest request,
                                                             ServletContext servletContext)
                                                      throws IllegalStateException

Look for the WebApplicationContext associated with the DispatcherServlet that has initiated request processing, and for the global context if none was found associated with the current request. This method is useful to allow components outside the framework, such as JSP tag handlers, to access the most specific application context available.

Parameters:

request - current HTTP request

servletContext - current servlet context

Returns:

the request-specific WebApplicationContext, or the global one if no request-specific context has been found

Throws:

IllegalStateException - if neither a servlet-specific nor a global context has been found

getLocaleResolver

public static LocaleResolver getLocaleResolver(HttpServletRequest request)

Return the LocaleResolver that has been bound to the request by the DispatcherServlet.

Parameters:

request - current HTTP request

Returns:

the current LocaleResolver, or null if not found

getLocale

public static Locale getLocale(HttpServletRequest request)

Retrieve the current locale from the given request, using the LocaleResolver bound to the request by the DispatcherServlet (if available), falling back to the request's accept-header Locale.

This method serves as a straightforward alternative to the standard Servlet ServletRequest.getLocale() method, falling back to the latter if no more specific locale has been found.

Consider using LocaleContextHolder.getLocale() which will normally be populated with the same Locale.

Parameters:

request - current HTTP request

Returns:

the current locale for the given request, either from the LocaleResolver or from the plain request itself

See Also:

getLocaleResolver(javax.servlet.http.HttpServletRequest), LocaleContextHolder.getLocale()

getTimeZone

public static TimeZone getTimeZone(HttpServletRequest request)

Retrieve the current time zone from the given request, using the TimeZoneAwareLocaleResolver bound to the request by the DispatcherServlet (if available), falling back to the system's default time zone.

Note: This method returns null if no specific time zone can be resolved for the given request. This is in contrast to getLocale(javax.servlet.http.HttpServletRequest) where there is always the request's accept-header locale to fall back to.

Consider using LocaleContextHolder.getTimeZone() which will normally be populated with the same TimeZone: That method only differs in terms of its fallback to the system time zone if the LocaleResolver hasn't provided provided a specific time zone (instead of this method's null).

Parameters:

request - current HTTP request

Returns:

the current time zone for the given request, either from the TimeZoneAwareLocaleResolver or null if none associated

See Also:

getLocaleResolver(javax.servlet.http.HttpServletRequest), LocaleContextHolder.getTimeZone()

getThemeResolver

public static ThemeResolver getThemeResolver(HttpServletRequest request)

Return the ThemeResolver that has been bound to the request by the DispatcherServlet.

Parameters:

request - current HTTP request

Returns:

the current ThemeResolver, or null if not found

getThemeSource

public static ThemeSource getThemeSource(HttpServletRequest request)

Return the ThemeSource that has been bound to the request by the DispatcherServlet.

Parameters:

request - current HTTP request

Returns:

the current ThemeSource

getTheme

public static Theme getTheme(HttpServletRequest request)

Retrieves the current theme from the given request, using the ThemeResolver and ThemeSource bound to the request by the DispatcherServlet.

Parameters:

request - current HTTP request

Returns:

the current theme, or null if not found

See Also:

getThemeResolver(javax.servlet.http.HttpServletRequest)

getInputFlashMap

public static Map<String,?> getInputFlashMap(HttpServletRequest request)

Return a read-only Map with "input" flash attributes saved on a previous request.

Parameters:

request - the current request

Returns:

a read-only Map, or null if not found

See Also:

FlashMap

getOutputFlashMap

public static FlashMap getOutputFlashMap(HttpServletRequest request)

Return the "output" FlashMap with attributes to save for a subsequent request.

Parameters:

request - the current request

Returns:

a FlashMap instance (never null within a DispatcherServlet request)

See Also:

FlashMap

getFlashMapManager

public static FlashMapManager getFlashMapManager(HttpServletRequest request)

Return the FlashMapManager instance to save flash attributes with before a redirect.

Parameters:

request - the current request

Returns:

a FlashMapManager instance (never null within a DispatcherServlet request)