Parse Accept-Language header in Java

Question

The accept-language header in request is usually a long complex string -

Eg.

Accept-Language : en-ca,en;q=0.8,en-us;q=0.6,de-de;q=0.4,de;q=0.2
         


        

Answer 1

We are using Spring boot and Java 8. This works

In ApplicationConfig.java write this

@Bean

public LocaleResolver localeResolver() {
    return new SmartLocaleResolver();
}

and I have this list in my constants class that has languages that we support

List locales = Arrays.asList(new Locale("en"),
                                         new Locale("es"),
                                         new Locale("fr"),
                                         new Locale("es", "MX"),
                                         new Locale("zh"),
                                         new Locale("ja"));

and write the logic in the below class.

public class SmartLocaleResolver extends AcceptHeaderLocaleResolver {
          @Override
         public Locale resolveLocale(HttpServletRequest request) {
            if (StringUtils.isBlank(request.getHeader("Accept-Language"))) {
            return Locale.getDefault();
            }
            List ranges = Locale.LanguageRange.parse("da,es-MX;q=0.8");
            Locale locale = Locale.lookup(ranges, locales);
            return locale ;
        }
}