Java 如何使用Spring的i18n机制？
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How to use Spring's i18n mechanism?
提问by Niklas
I added localization to my Spring project and it appears to be working but I wonder how I change the language, if the language choice is done based on the browser setting, the HTTP header, a cookie or something else. Is there a way to be explicit as well e.g. taking the locale as a parameter in a way like e.g. hl=deon the HTTP query string? I also want to allow the user to set the language on a settings page, how can I do that? My implementation looks like this and writes messages in English:
我在 Spring 项目中添加了本地化，它似乎正在运行，但我想知道如何更改语言，如果语言选择是基于浏览器设置、HTTP 标头、cookie 或其他内容完成的。有没有一种方法也可以明确，例如将语言环境作为参数，例如hl=de在 HTTP 查询字符串上？我还想允许用户在设置页面上设置语言，我该怎么做？我的实现看起来像这样并用英语写消息：
<h4 class="title"><fmt:message key="login.title"/></h4>
<h4 class="title"><fmt:message key="login.title"/></h4>
servlet.xml:
servlet.xml：
<bean id="messageSource"
class="org.springframework.context.support.ReloadableResourceBundleMessageSource">
<property name="basename" value="classpath:messages" />
<property name="defaultEncoding" value="UTF-8"/>
</bean>
<bean id="localeChangeInterceptor"
class="org.springframework.web.servlet.i18n.LocaleChangeInterceptor">
<property name="paramName" value="lang" />
</bean>
<bean id="localeResolver"
class="org.springframework.web.servlet.i18n.CookieLocaleResolver">
<property name="defaultLocale" value="en"/>
</bean>
<bean id="handlerMapping"
class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping">
<property name="interceptors">
<ref bean="localeChangeInterceptor" />
</property>
</bean>
So how can I
那我怎么能
a) Make the locale choice explicit by enabling overriding the locale with a HTTP GET parameter such as hl=defor German and hl=frfor French?
a) 通过使用 HTTP GET 参数（例如hl=de德语和hl=fr法语）覆盖语言环境，使语言环境选择明确？
b) Let a user choose locale?
b) 让用户选择语言环境？
Update
更新
The interceptor is not working. The XML is:
拦截器不起作用。XML是：
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">
<bean id="messageSource"
class="org.springframework.context.support.ReloadableResourceBundleMessageSource">
<property name="basename" value="classpath:messages" />
<property name="defaultEncoding" value="UTF-8"/>
</bean>
<bean id="localeResolver" class="org.springframework.web.servlet.i18n.SessionLocaleResolver">
<property name="defaultLocale" value="sv" />
</bean>
<mvc:interceptors>
<bean id="localeChangeInterceptor" class="org.springframework.web.servlet.i18n.LocaleChangeInterceptor">
<property name="paramName" value="language" />
</bean>
</mvc:interceptors>
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<!-- one of the properties available; the maximum file size in bytes -->
<property name="maxUploadSize" value="100000"/>
</bean>
</beans>
采纳答案by Emanuele Righetto
a) you defined a bean with id localeChangeInterceptor:
a) 你定义了一个 id 为 localeChangeInterceptor 的 bean：
<bean id="localeChangeInterceptor"
class="org.springframework.web.servlet.i18n.LocaleChangeInterceptor">
<property name="paramName" value="lang" />
</bean>
this interceptor enable you to change your locale using the param you choose (in this case: "lang") in your query string (ie: http://mydomain.com/mypage?lang=frfor french)
这个拦截器使您能够使用您在查询字符串中选择的参数（在这种情况下：“lang”）更改您的语言环境（即：http://mydomain.com/mypage?lang= fr法语）
b) you can provide users link for changing locale using point a) c) you selected a default locale: "en". otherwhise locale is choosen using browser language
b) 您可以使用 a) 点为用户提供更改区域设置的链接 c) 您选择了默认区域设置：“en”。否则使用浏览器语言选择语言环境
NOTE: you should use <spring:message code="${msg.value}" arguments="${msg.args}"/>for your localized string, not fmt, for more integration with spring...
注意：您应该<spring:message code="${msg.value}" arguments="${msg.args}"/>用于本地化字符串，而不是 fmt，以便与 spring 进行更多集成...
回答by Ralph
You already have configured the LocaleChangeInterceptor. Its parameter paramName(you set it to lang) is the request parameter that changed the locale.
您已经配置了LocaleChangeInterceptor. 它的参数paramName（您将其设置为lang）是更改区域设置的请求参数。
change the configuration to hl, then you can use this parameter to change it:
将配置更改为hl，则可以使用此参数进行更改：
<bean id="localeChangeInterceptor"
class="org.springframework.web.servlet.i18n.LocaleChangeInterceptor">
<property name="paramName" value="hl" />
</bean>
to let the user change the local, you only need to add some link to the page
让用户改变本地，你只需要添加一些链接到页面
<a href="${currentPage}?hl=de">German</a>
