您需要添加一个LocaleChangeInterceptor并按如下方式配置bean:
参考
Spring Boot internationalization
更多
@Bean
public LocaleChangeInterceptor localeChangeInterceptor() {
    LocaleChangeInterceptor lci = new LocaleChangeInterceptor();
    lci.setParamName("lang");
    return lci;
}
如果只想使用“Accept Language”头,则可以扩展AcceptHeaderLocalerResolver并可以自定义:
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;
}
}
