Spring 如果语言环境无效，mvc 从请求中获取默认语言环境

Question

我已经在我的 Spring MVC 应用程序（localeInterceptor 等）中配置了 i18n。

支持两种语言（英语和波兰语）。 PL 是默认的。 I18n 当然有效。

我的情况是获取当前语言环境并将其传递给模型。这很简单，但是当我传递无效的语言环境参数时（比如 localhost:8080/?language=asd），我得到 "asd" 而不是默认的 "pl"。

值得一提的是整个 i18n 工作完美，我的意思是在这种情况下使用 messages_pl.properties。我尝试了以下方法但没有成功：

@RequestMapping(...)
public String home(Locale locale,..)

localeResolver.resolveLocale(request);
RequestContextUtils.getLocale(request);
LocaleContextHolder.getLocale();

每一个都给我 "asd" 而不是 "pl"。

Atm 我有一个有点混乱的解决方法：

if (!supportedLocaleService.isLocaleSupported(locale)) {//myservice
    locale = new Locale("pl");
}

Answer 1

您可以覆盖 LocaleChangeInterceptor

public class SupportedLocaleAwareLocaleChangeInterceptor extends LocaleChangeInterceptor {

    private List<String>supportedLocales = Arrays.asList("pl",....);

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
        throws ServletException {

        String newLocale = request.getParameter(this.paramName);
        //if (newLocale != null) {
        if (newLocale != null && supportedLocales.contains(newLocale )) {
            LocaleResolver localeResolver = RequestContextUtils.getLocaleResolver(request);
            if (localeResolver == null) {
                throw new IllegalStateException("No LocaleResolver found: not in a DispatcherServlet request?");
            }
            localeResolver.setLocale(request, response, StringUtils.parseLocaleString(newLocale));
        }
        // Proceed in any case.
        return true;
    } 
}

Answer 2

还有一种方法。

public class CustomCookieLocaleResolver extends CookieLocaleResolver {

        private final List<String> permittedLanguages = Arrays.asList("sk", "en");

        @Override
        public Locale resolveLocale(HttpServletRequest request) {
            Locale locale = (Locale) request.getAttribute(LOCALE_REQUEST_ATTRIBUTE_NAME);
            if (locale != null && !permittedLanguages.contains(locale.getLanguage())) {
                locale = determineDefaultLocale(request);
            }
            return locale;
        }

        @Override
        public LocaleContext resolveLocaleContext(HttpServletRequest request) {

            try {
                LocaleContext context = super.resolveLocaleContext(request);
                return context;

            } catch (Exception e) {

            }

            final Locale defaultLocale = determineDefaultLocale(request);
            TimeZone defaultTimeZone2 = determineDefaultTimeZone(request);

            return new TimeZoneAwareLocaleContext() {
                @Override
                @Nullable
                public Locale getLocale() {
                    return defaultLocale;
                }

                @Override
                @Nullable
                public TimeZone getTimeZone() {
                    return defaultTimeZone2;
                }
            };
        }

        @Override
        public void addCookie(HttpServletResponse response, String cookieValue) {
            if (permittedLanguages.contains(cookieValue)) {
                super.addCookie(response, cookieValue);
            }
        }
    }

Spring 如果语言环境无效，mvc 从请求中获取默认语言环境

Spring mvc get default locale from request if locale is invalid

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