SpringMVC的国际化

SpringMVC的国际化

WebMVC的核心LocaleResolver，MessageSource。

WebMvcAutoConfiguration 是SpringBoot中的 Web方面的自动配置类。
在MVC的配置类里面，如果没有自定义的LocaleResolver，那么就会使用默认的。并且自定义的名称是“localeResolver”，才不会加载默认的。

默认使用的是AcceptHeaderLocaleResolver，这个类会从请求头里面获取Locale，如果没有，就使用默认的。

@Override
@Bean
@ConditionalOnMissingBean(name = DispatcherServlet.LOCALE_RESOLVER_BEAN_NAME)
public LocaleResolver localeResolver() {if (this.webProperties.getLocaleResolver() == WebProperties.LocaleResolver.FIXED) {return new FixedLocaleResolver(this.webProperties.getLocale());}AcceptHeaderLocaleResolver localeResolver = new AcceptHeaderLocaleResolver();localeResolver.setDefaultLocale(this.webProperties.getLocale());return localeResolver;
}@ConfigurationProperties("spring.web")
public class WebProperties {private Locale locale;private LocaleResolver localeResolver = LocaleResolver.ACCEPT_HEADER;private final Resources resources = new Resources();
}

1. 默认的LocaleResolver
   不需要更改，需要在请求头里面添加的Accept-Language属性。

2. 自定义的LocaleResolver
   需要从自定义的报文里面获取对应属性，就需要自定义LocaleResolver，获取报文属性里面的特定字段。

自定义实现国际化

1. 自定义的LocaleResolver、MessageSource、Validator添加国际化功能

@Configuration
public class LocaleWebMvcConfigurer implements WebMvcConfigurer {@Value("${spring.messages.basename:[]}")private String[] basename;@Beanpublic MessageSource messageSource() {ReloadableResourceBundleMessageSource messageSource =new ReloadableResourceBundleMessageSource();List<String> baseNames = new ArrayList<>();baseNames.add("classpath:i18n/validation/messages");Optional.ofNullable(basename).ifPresent(path -> {baseNames.addAll(Arrays.asList(path));});messageSource.setBasenames(baseNames.toArray(new String[0]));messageSource.setDefaultEncoding(StandardCharsets.UTF_8.name());return messageSource;}@Overridepublic Validator getValidator() {return validator();}@Beanpublic Validator validator() {LocalValidatorFactoryBean validator = new LocalValidatorFactoryBean();validator.setValidationMessageSource(messageSource());return validator;}@Beanpublic LocaleResolver localeResolver() {return new CustomLocaleResolver();}private static class CustomLocaleResolver implements LocaleResolver {@Overridepublic Locale resolveLocale(HttpServletRequest request) {String[] locales = Optional.ofNullable((String) FlowRuntimeContext.getTechProperty("LOCALE")).orElse(Locale.getDefault().toString()).split("_");return new Locale(locales[0], locales[1]);}@Overridepublic void setLocale(HttpServletRequest request, HttpServletResponse response, Locale locale) {}}
}

2. 指定类路径下添加语言包message.properties,message_zh_CN.properties,message_en_US.properties,message_zh_TW.properties

3. 使用MessageSource获取对应的message
   messageSource.getMessage(String code, @Nullable Object[] args, Locale locale);