Using locales Web MVC framework
22.8 Using locales
Most parts of Spring’s architecture support internationalization, just as the Spring web MVC framework does. DispatcherServlet enables you to automatically resolve messages using the client’s locale. This is done with LocaleResolver objects. When a request comes in, the DispatcherServlet looks for a locale resolver, and if it finds one it tries to use it to set the locale. Using the RequestContext.getLocale method, you can always retrieve the locale that was resolved by the locale resolver. In addition to automatic locale resolution, you can also attach an interceptor to the handler mapping see the section called “Intercepting requests with a HandlerInterceptor” for more information on handler mapping interceptors to change the locale under specific circumstances, for example, based on a parameter in the request. Locale resolvers and interceptors are defined in the org.springframework.web.servlet.i18n package and are configured in your application context in the normal way. Here is a selection of the locale resolvers included in Spring. Obtaining Time Zone Information In addition to obtaining the client’s locale, it is often useful to know their time zone. The LocaleContextResolver interface offers an extension to LocaleResolver that allows resolvers to provide a richer LocaleContext , which may include time zone information. When available, the user’s TimeZone can be obtained using the RequestContext.getTimeZone method. Time zone information will automatically be used by DateTime Converter and Formatter objects registered with Spring’s ConversionService . 4.3.9.RELEASE Spring Framework 532 AcceptHeaderLocaleResolver This locale resolver inspects the accept-language header in the request that was sent by the client e.g., a web browser. Usually this header field contains the locale of the client’s operating system. Note that this resolver does not support time zone information. CookieLocaleResolver This locale resolver inspects a Cookie that might exist on the client to see if a Locale or TimeZone is specified. If so, it uses the specified details. Using the properties of this locale resolver, you can specify the name of the cookie as well as the maximum age. Find below an example of defining a CookieLocaleResolver . bean id = localeResolver class = org.springframework.web.servlet.i18n.CookieLocaleResolver property name = cookieName value = clientlanguage -- in seconds. If set to -1, the cookie is not persisted deleted when browser shuts down -- property name = cookieMaxAge value = 100000 bean Table 22.4. CookieLocaleResolver properties Property Default Description cookieName classname + LOCALE The name of the cookie cookieMaxAge Servlet container default The maximum time a cookie will stay persistent on the client. If -1 is specified, the cookie will not be persisted; it will only be available until the client shuts down their browser. cookiePath Limits the visibility of the cookie to a certain part of your site. When cookiePath is specified, the cookie will only be visible to that path and the paths below it. SessionLocaleResolver The SessionLocaleResolver allows you to retrieve Locale and TimeZone from the session that might be associated with the user’s request. 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 SessionLocaleResolver will simply evaluate and modify corresponding HttpSession attributes against the current HttpServletRequest . LocaleChangeInterceptor You can enable changing of locales by adding the LocaleChangeInterceptor to one of the handler mappings see Section 22.4, “Handler mappings”. It will detect a parameter in the request and change the locale. It calls setLocale on the LocaleResolver that also exists in the context. The following example shows that calls to all .view resources containing a parameter named siteLanguage will now change the locale. So, for example, a request for the following URL, http:www.sf.net home.view?siteLanguage=nl will change the site language to Dutch. 4.3.9.RELEASE Spring Framework 533 bean id = localeChangeInterceptor class = org.springframework.web.servlet.i18n.LocaleChangeInterceptor property name = paramName value = siteLanguage bean bean id = localeResolver class = org.springframework.web.servlet.i18n.CookieLocaleResolver bean id = urlMapping class = org.springframework.web.servlet.handler.SimpleUrlHandlerMapping property name = interceptors list ref bean = localeChangeInterceptor list property property name = mappings value .view=someController value property bean22.9 Using themes
Parts
» Dependency Injection and Inversion of Control Framework Modules
» Usage scenarios Introduction to the Spring Framework
» Java EE 6 and 7 Groovy Bean Definition DSL
» Core Container Improvements General Web Improvements
» WebSocket, SockJS, and STOMP Messaging Testing Improvements
» JMS Improvements Caching Improvements
» Web Improvements New Features and Enhancements in Spring Framework 1
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» Core Container Improvements New Features and Enhancements in Spring Framework 4.2
» Data Access Improvements JMS Improvements Web Improvements
» Core Container Improvements Data Access Improvements Caching Improvements
» JMS Improvements Web Improvements WebSocket Messaging Improvements Testing Improvements
» Introduction to the Spring IoC container and beans
» Container overview The IoC container
» Bean overview The IoC container
» Dependencies The IoC container
» y.Baz beans The IoC container
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» y.Bar bean y.Foo constructor-arg y.Foo c:bar-ref baz-ref = y.Foo c:_0-ref _1-ref =
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» Using JSR 330 Standard Annotations
» Java-based container configuration The IoC container
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» The BeanFactory The IoC container
» Introduction The Resource interface
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» Introduction Validation, Data Binding, and Type Conversion
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» Spring Type Conversion Validation, Data Binding, and Type Conversion
» Spring Field Formatting Validation, Data Binding, and Type Conversion
» Configuring a global date time format
» Spring Validation Validation, Data Binding, and Type Conversion
» Introduction Feature Overview Spring Expression Language SpEL
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» Language Reference Spring Expression Language SpEL
» 3e0 4 .getValueDouble. 4e0 2 .getValueDouble.
» Classes used in the examples
» Introduction Aspect Oriented Programming with Spring
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» Choosing which AOP declaration style to use
» Mixing aspect types Proxying mechanisms
» Introduction Pointcut API in Spring
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» Using TargetSources Spring AOP APIs
» Mock Objects Unit Testing support Classes
» Overview Goals of Integration Testing
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» loginAction-ref = username = userPreferences-ref = theme =
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» Application server-specific integration Transaction Management
» Introduction Consistent exception hierarchy
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» Introduction to Spring Framework JDBC
» Using the JDBC core classes to control basic JDBC processing and error handling
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» Common problems with parameter and data value handling
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» Introduction to ORM with Spring
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» Introduction Marshaller and Unmarshaller
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» XML Schema-based Configuration JAXB
» Castor Marshalling XML using OX Mappers
» XMLBeans JiBX Marshalling XML using OX Mappers
» XStream Marshalling XML using OX Mappers
» Introduction to Spring Web MVC framework
» The DispatcherServlet Web MVC framework
» Handler mappings Web MVC framework
» Resolving views Web MVC framework
» Using flash attributes Web MVC framework
» Building URIs Web MVC framework
» Using locales Web MVC framework
» Using themes Web MVC framework
» Spring’s multipart file upload support
» Handling exceptions Web MVC framework
» Web Security Convention over configuration support
» y.RegistrationController HTTP caching support
» Code-based Servlet container initialization
» Configuring Spring MVC Web MVC framework
» simpleDateFormat = Web MVC framework
» Introduction Thymeleaf Groovy Markup Templates
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» Feed Views JSON Mapping View
» Introduction Integrating with other web frameworks
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» JavaServer Faces 1.2 Apache Struts 2.x
» Introduction Portlet MVC Framework
» The DispatcherPortlet Portlet MVC Framework
» The ViewRendererServlet Controllers Portlet MVC Framework
» Handler mappings Portlet MVC Framework
» Views and resolving them Multipart file upload support
» Handling exceptions Annotation-based controller configuration
» absolute-ordering absolute-ordering WebSocket API
» SockJS Fallback Options WebSocket Support
» STOMP Over WebSocket Messaging Architecture
» Introduction Controller method CORS configuration
» Global CORS configuration Advanced Customization
» Introduction Remoting and web services using Spring
» Using Hessian or Burlap to remotely call services via HTTP
» Exposing services using HTTP invokers
» Web services Remoting and web services using Spring
» JMS Remoting and web services using Spring
» Accessing RESTful services on the Client
» Introduction Accessing EJBs Enterprise JavaBeans EJB integration
» Introduction JMS Java Message Service
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» Sending a Message JMS Java Message Service
» Receiving a message JMS Java Message Service
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» Introduction Exporting your beans to JMX
» Controlling the management interface of your beans
» Controlling the ObjectNames for your beans
» Accessing MBeans via Proxies
» Introduction Configuring CCI JCA CCI
» Using Spring’s CCI access support
» Modeling CCI access as operation objects
» Using the JavaMail MimeMessageHelper
» Introduction The Spring TaskExecutor abstraction
» The Spring TaskScheduler abstraction
» Annotation Support for Scheduling and Asynchronous Execution
» The task namespace Task Execution and Scheduling
» Introduction A first example
» y.DefaultBookingService property Defining beans that are backed by dynamic languages
» y.DefaultBookingService property Dynamic language support
» Scenarios Dynamic language support
» Bits and bobs y.DefaultBookingService property
» Introduction Understanding the cache abstraction
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» JCache JSR-107 annotations Cache Abstraction
» Declarative XML-based caching y.service.DefaultBookService
» Configuring the cache storage name =
» Classic ORM usage Classic Spring Usage
» JMS Usage Classic Spring Usage
» Concise proxy definitions Classic Spring AOP Usage
» Using the autoproxy facility
» Using TargetSources Classic Spring AOP Usage
» Introduction XML Schema-based configuration
» Introduction Authoring the schema
» Coding a NamespaceHandler Extensible XML authoring
» BeanDefinitionParser Extensible XML authoring
» Registering the handler and the schema
» Using a custom extension in your Spring XML configuration Meatier examples
» Introduction The argument tag The bind tag
» The escapeBody tag The eval tag The hasBindErrors tag
» The htmlEscape tag The message tag
» The nestedPath tag The param tag The theme tag
» The transform tag The url tag
» Introduction The button tag The checkbox tag
» The checkboxes tag The errors tag
» The option tag The options tag
» The password tag The radiobutton tag
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