您需要添加一个LocaleChangeInterceptor并按如下所示配置bean：更多信息请参考Spring Boot internationalization

@Bean
public LocaleChangeInterceptor localeChangeInterceptor() {
    LocaleChangeInterceptor lci = new LocaleChangeInterceptor();
    lci.setParamName("lang");
    return lci;
}

如果只想使用“Accept-Language”标头，则可以扩展AcceptHeaderLocaleResolver并自定义：

package com.deb.demo.config;

import java.util.Arrays;
import java.util.List;
import java.util.Locale;

import javax.servlet.http.HttpServletRequest;

import org.springframework.util.StringUtils;
import org.springframework.web.servlet.i18n.AcceptHeaderLocaleResolver;

public class CustomLocaleResolver extends AcceptHeaderLocaleResolver {

    List<Locale> LOCALES = Arrays.asList(new Locale("en"),new Locale("es"),new Locale("fr"));

  @Override
  public Locale resolveLocale(HttpServletRequest request) {
     if (StringUtils.isEmpty(request.getHeader("Accept-Language"))) {
         return Locale.getDefault();
       }
     List<Locale.LanguageRange> list = Locale.LanguageRange.parse(request.getHeader("Accept-Language"));
     Locale locale = Locale.lookup(list,LOCALES);
      return locale;
     }
}

我在用豆子

@Bean
  public LocaleResolver localeResolver() {
    AcceptHeaderLocaleResolver slr = new AcceptHeaderLocaleResolver();
    slr.setDefaultLocale(Locale.UK);
    return slr;
  }

然后又是一个

@Bean
  public LanguageUtil languageUtil() {
    return new LanguageUtil();
  }

与

private Locale getLocale() {
    return LocaleContextHolder.getLocale();
  }

  public String getLocalizedMessage(String messageKey) {
    return messageSource.getMessage(messageKey, null, getLocale());
  }

标头保存在LocaleContextHolder中，您可以在需要时使用它。

创建自定义AcceptHeaderLocaleResolver

public class AcceptHeaderResolver extends AcceptHeaderLocaleResolver {

    List<Locale> LOCALES = Arrays.asList(new Locale("en"), new Locale("ar"));

    @Override
    public Locale resolveLocale(HttpServletRequest request) {
        String headerLang = request.getHeader("Accept-Language");
        return headerLang == null || headerLang.isEmpty()
                ? Locale.getDefault()
                : Locale.lookup(Locale.LanguageRange.parse(headerLang), LOCALES);
    }

}

不要忘记在@Configuration文件中使用它

@Bean
public LocaleResolver sessionLocaleResolver() {
    AcceptHeaderResolver localeResolver = new AcceptHeaderResolver();
    return localeResolver;
}

如果您想在REST控制器级别上获得这个特性，您可以直接在REST方法中获得locale示例。

@GetMapping("/status")
public ResponseEntitiy<String> getStatus(final Locale locale) {

}

您创建的LocaleResolver bean只能在SpringMVC中使用，而不能在Jersey容器中使用，使用LocaleResolver的是Spring的DispatcherServlet。
因此，区域上下文保持器。getLocale（）;将返回不同的本地值，具体取决于是在Jersey控制器还是Spring MVC控制器中调用。

不需要扩展AcceptHeaderLocaleResolver，创建bean定义如下：

@Bean
public LocalResolver localeResolver() {
    AcceptHeaderLocaleResolver localeResolver = new AcceptHeaderLocaleResolver();
    localeResolver.setSupportedLocales(Arrays.asList(new Locale("fa"), new Locale("en")));
    localeResolver.setDefaultLocale(new Locale("fa"));
    return localeResolver;
}

你必须在你的API端点中添加Accept-Language标头来获得所需的语言环境输出。然后你必须添加以下配置来解析和设置来自传入请求的Accept-Language标头值。

@Configuration
public class I18NConfiguration {

    @Value("${i18n.locale.default:en-US}")
    private String defaultLocale;

    @Value("#{'${i18n.locale.supported: }'.split(',\\s*')}")
    private List<String> supportedLocales;

    @Bean
    public LocaleResolver localeResolver() {
        AcceptHeaderLocaleResolver acceptHeaderLocaleResolver = new AcceptHeaderLocaleResolver();
        acceptHeaderLocaleResolver.setDefaultLocale(Locale.forLanguageTag(defaultLocale));

        if (supportedLocales != null && !supportedLocales.isEmpty()) {
            List<Locale> localeList = supportedLocales.stream().map(Locale::forLanguageTag).collect(Collectors.toUnmodifiableList());
            acceptHeaderLocaleResolver.setSupportedLocales(localeList);
        }
        return acceptHeaderLocaleResolver;
    }
}