2018年06月19日 11:00:31 流烟默 阅读数:344
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Springboot框架,SpringBoot自动配置好了管理国际化资源文件的组件:
@Configuration
@ConditionalOnMissingBean(value = MessageSource.class, search = SearchStrategy.CURRENT)
@AutoConfigureOrder(Ordered.HIGHEST_PRECEDENCE)
@Conditional(ResourceBundleCondition.class)
@EnableConfigurationProperties
@ConfigurationProperties(prefix = "spring.messages")
public class MessageSourceAutoConfiguration {private static final Resource[] NO_RESOURCES = {};/*** Comma-separated list of basenames (essentially a fully-qualified classpath* location), each following the ResourceBundle convention with relaxed support for* slash based locations. If it doesn't contain a package qualifier (such as* "org.mypackage"), it will be resolved from the classpath root.*/private String basename = "messages";//我们的配置文件可以直接放在类路径下叫messages.properties;/*** Message bundles encoding.*/private Charset encoding = Charset.forName("UTF-8");/*** Loaded resource bundle files cache expiration, in seconds. When set to -1, bundles* are cached forever.*/private int cacheSeconds = -1;/*** Set whether to fall back to the system Locale if no files for a specific Locale* have been found. if this is turned off, the only fallback will be the default file* (e.g. "messages.properties" for basename "messages").*/private boolean fallbackToSystemLocale = true;/*** Set whether to always apply the MessageFormat rules, parsing even messages without* arguments.*/private boolean alwaysUseMessageFormat = false;//为容器添加了ResourceBundleMessageSource 组件@Beanpublic MessageSource messageSource() {ResourceBundleMessageSource messageSource = new ResourceBundleMessageSource();if (StringUtils.hasText(this.basename)) {//设置国际化资源文件的基础名(去掉语言国家代码的)messageSource.setBasenames(StringUtils.commaDelimitedListToStringArray(StringUtils.trimAllWhitespace(this.basename)));}if (this.encoding != null) {messageSource.setDefaultEncoding(this.encoding.name());}messageSource.setFallbackToSystemLocale(this.fallbackToSystemLocale);messageSource.setCacheSeconds(this.cacheSeconds);messageSource.setAlwaysUseMessageFormat(this.alwaysUseMessageFormat);return messageSource;}
还可以在SpringBoot的配置文件中使用spring.messages前缀配置国际化:
# 国际化配置文件(包名.基础名)
spring.messages.basename=i18n.login
抽取页面需要显示的国际化消息,编写国际化资源文件。
java国际化?login.properties
如图所示,idea会自动切换到国际化视图。另外,在编写properties时,除了传统的使用key:value在properties中编写外,还可以如下所示:
如下所示,在页面中使用properties的属性:
<label class="sr-only" th:text="#{login.username}">Username</label>
<input type="text" name="username" class="form-control" placeholder="Username" th:placeholder="#{login.username}" required="" autofocus="">
<label class="sr-only" th:text="#{login.password}">Password</label>
<input type="password" name="password" class="form-control" placeholder="Password" th:placeholder="#{login.password}" required="">
<div class="checkbox mb-3">
<label>
<input type="checkbox" value="remember-me"/> [[#{login.remember}]]
//这里使用行内写法,input是自结束标签,没有标签体
</label>
</div>
<button class="btn btn-lg btn-primary btn-block" type="submit" th:text="#{login.btn}">Sign in</button>
注意这里使用的是#{…}语法,可以参考Thymeleaf中第四章Standard Expression Syntax中4.1Messages讲解,如下图.
测试结果:
浏览器设置英文:
浏览器设置中文:
首先明白两个组件:国际化Locale(区域信息对象);LocaleResolver(获取区域信息对象)。
① WebMVCAutoConfiguration中对LocaleResolver 配置
@Bean
@ConditionalOnMissingBean
@ConditionalOnProperty(prefix = "spring.mvc", name = "locale")
public LocaleResolver localeResolver() {if (this.mvcProperties.getLocaleResolver() == WebMvcProperties.LocaleResolver.FIXED) {return new FixedLocaleResolver(this.mvcProperties.getLocale());}AcceptHeaderLocaleResolver localeResolver = new AcceptHeaderLocaleResolver();localeResolver.setDefaultLocale(this.mvcProperties.getLocale());return localeResolver;
}
如果spring.mvc.locale没有指定,那么就返回一个AcceptHeaderLocaleResolver 。如果指定了spring.mvc.locale,那么就返回FixedLocaleResolver。
② 查看AcceptHeaderLocaleResolver
@Overridepublic Locale resolveLocale(HttpServletRequest request) {Locale defaultLocale = getDefaultLocale();if (defaultLocale != null && request.getHeader("Accept-Language") == null) {return defaultLocale;}Locale requestLocale = request.getLocale();if (isSupportedLocale(requestLocale)) {return requestLocale;}Locale supportedLocale = findSupportedLocale(request);if (supportedLocale != null) {return supportedLocale;}return (defaultLocale != null ? defaultLocale : requestLocale);}
从请求头里面解析Locale!这也就是为什么浏览器切换语言显示不同资源的原理。
如下图所示,通过点击中文英文按钮切换不同资源显示:
① 页面修改如下:
<a class="btn btn-sm" th:href="@{/index.html(l='zh_CN')}">中文</a>
<a class="btn btn-sm" th:href="@{/index.html(l='en_US')}">English</a>
这里使用的是Thymeleaf模板引擎中链接参数的写法(key=value)
,也可以使用原始写法如下:
<a class="btn btn-sm" th:href="@{/index.html?l=zh_CN}">中文</a>
<a class="btn btn-sm" th:href="@{/index.html?l=en_US}">English</a>
② 编写自定义区域信息解析器
/*** 可以在连接上携带区域信息*/
public class MyLocaleResolver implements LocaleResolver {@Overridepublic Locale resolveLocale(HttpServletRequest request) {String l = request.getParameter("l");Locale locale = Locale.getDefault();if(!StringUtils.isEmpty(l)){String[] split = l.split("_");locale = new Locale(split[0],split[1]);}return locale;}@Overridepublic void setLocale(HttpServletRequest request, HttpServletResponse response, Locale locale) {}
}
将其添加到容器中:
@Configuration
public class MyMvcConfig extends WebMvcConfigurerAdapter {@Beanpublic LocaleResolver localeResolver(){return new MyLocaleResolver();}
}
③ Locale.getDefault()
该方法根据系统环境拿到Locale,如本机上如果没有传 l 参数,那么就会返回defaultLocale。此时无论浏览器语言设置什么,都显示中文。
/*** Gets the current value of the default locale for this instance* of the Java Virtual Machine.* <p>* The Java Virtual Machine sets the default locale during startup* based on the host environment. It is used by many locale-sensitive* methods if no locale is explicitly specified.* It can be changed using the* {@link #setDefault(java.util.Locale) setDefault} method.** @return the default locale for this instance of the Java Virtual Machine*/public static Locale getDefault() {// do not synchronize this method - see 4071298return defaultLocale;}
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