Spring Boot, Hibernate 驗證器語言基於 LocaleContextHolder

Question

I've a Spring Boot 2.4.2 REST application using JPA, Hibernate, etc. So far I use a MessageSource for applications errors (located in i18n/messages), and the default ValidationMessages for bean validations.

這是我的配置的一部分：

 public static Set<Locale> LOCALES = Set.of(new Locale("en"), new Locale("it"));


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

    public class SmartLocaleResolver extends AcceptHeaderLocaleResolver {
        @Override
        public Locale resolveLocale(HttpServletRequest request) {
            if (StringUtils.isBlank(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;
        }
    }

    @Primary
    @Bean("messageSource")
    public MessageSource messageSource() {
        ReloadableResourceBundleMessageSource messageSource = new ReloadableResourceBundleMessageSource();
        messageSource.setAlwaysUseMessageFormat(true);
        messageSource.setBasenames("classpath:/i18n/messages");
        // set to true only for debugging
        messageSource.setUseCodeAsDefaultMessage(false);
        messageSource.setFallbackToSystemLocale(false);
        return messageSource;
    }

到目前為止，我的應用程序支持 2 種語言： it和en 。 現在的問題是應用程序的消息在代理的語言（瀏覽器）中正確本地化，但驗證錯誤不是。

我發現 Hibernate 使用默認語言環境 (Locale.getDefault()) 並自定義行為我應該自定義語言環境分辨率。

所以我嘗試創建一個自定義 hibernateValidator（我在我的 entityFactory 中設置）：

  @Bean
public MessageSource validationMessageSource() {
    ReloadableResourceBundleMessageSource messageSource = new ReloadableResourceBundleMessageSource();
    messageSource.setAlwaysUseMessageFormat(true);
    messageSource.setBasenames("classpath:/ValidationMessages");
    // set to true only for debugging
    messageSource.setUseCodeAsDefaultMessage(false);
    messageSource.setFallbackToSystemLocale(false);
    return messageSource;
}

 @Bean("hibernateValidator")
    public LocalValidatorFactoryBean hibernateValidator() {
        LocalValidatorFactoryBean factoryBean = new LocalValidatorFactoryBean();
        factoryBean.setValidationMessageSource(validationMessageSource());           
        return factoryBean;
    }

和解析器：

public class HibernateLocaleResolver implements LocaleResolver {

    @Override
    public Locale resolve(LocaleResolverContext context) {
        return LocaleContextHolder.getLocale();
    }
}

這樣做，語言環境解析工作正常，但參數替換不行。 我的意思是這樣的消息：

server.validators.ArraySize.message = The number of values must be between [{min}] and [{max}].

我有一個例外：

"exception": "java.lang.IllegalArgumentException", "message": "can't parse argument number: min"

所以我更改了上面的配置，添加了 MessageInterpolator：

factoryBean.setMessageInterpolator(new ResourceBundleMessageInterpolator(LOCALES, Locale.ENGLISH, new HibernateLocaleResolver(), false));

此時參數已正確解析，但語言環境解析再次不起作用。

你能指出我正確的方向，試圖解釋組合 Spring 引導 - Hibernate 驗證器的最佳實踐嗎？

Answer 1

我解決了這個問題。 我希望這可以幫助別人。 這是我的配置文件：

@Primary
@Bean("messageSource")
public MessageSource messageSource() {
    ReloadableResourceBundleMessageSource messageSource = new ReloadableResourceBundleMessageSource();
    messageSource.setAlwaysUseMessageFormat(true);
    messageSource.setBasenames("classpath:/i18n/messages");
    // set to true only for debugging
    messageSource.setUseCodeAsDefaultMessage(false);
    messageSource.setFallbackToSystemLocale(false);
    return messageSource;
}

@Bean
public MessageSource validationMessageSource() {
    ReloadableResourceBundleMessageSource messageSource = new ReloadableResourceBundleMessageSource();
    messageSource.setAlwaysUseMessageFormat(true);
    messageSource.setBasenames("classpath:/ValidationMessages");
    // set to true only for debugging
    messageSource.setUseCodeAsDefaultMessage(false);
    messageSource.setFallbackToSystemLocale(false);
    return messageSource;
}

@Bean
public LocalValidatorFactoryBean validator() {
    LocalValidatorFactoryBean factoryBean = new LocalValidatorFactoryBean();
    factoryBean.setValidationMessageSource(validationMessageSource());
    MessageInterpolatorFactory interpolatorFactory = new MessageInterpolatorFactory();
    factoryBean.setMessageInterpolator(interpolatorFactory.getObject());
    return factoryBean;
}

和 LocaleConfiguration：

@Configuration
public class LocaleConfiguration implements WebMvcConfigurer {

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

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

我看到的重要部分有所不同的是以下幾行：

MessageInterpolatorFactory interpolatorFactory = new MessageInterpolatorFactory();
factoryBean.setMessageInterpolator(interpolatorFactory.getObject());

通過這種方式，插值器可以正常工作以及消息的本地化。