Thymeleaf + Spring (not Boot) - 如何显示来自 messageSource 的消息

Question

我在使用 Thymeleaf 设置 Spring MVC（不使用 Boot，因为我在发现 Spring Initializr 之前启动它）以显示来自我的资源包的消息时遇到问题。

应用的主要配置类是：

@Configuration
@EnableWebMvc
@ComponentScan(basePackages = "b.c.m.h")
public class HrmConfiguration extends WebMvcConfigurerAdapter {

    @Bean
    public ViewResolver viewResolver() {
        ServletContextTemplateResolver templateResolver = new ServletContextTemplateResolver();
        templateResolver.setTemplateMode("HTML5");
        templateResolver.setCharacterEncoding("UTF-8");
        templateResolver.setPrefix("/WEB-INF/html/");
        templateResolver.setSuffix(".html");

        SpringTemplateEngine engine = new SpringTemplateEngine();
        engine.addDialect(new SpringSecurityDialect());
        engine.addDialect(new LayoutDialect(new GroupingStrategy()));
        engine.setTemplateResolver(templateResolver);

        ThymeleafViewResolver viewResolver = new ThymeleafViewResolver();
        viewResolver.setTemplateEngine(engine);
        viewResolver.setCache(false);

        return viewResolver;
    }

    @Bean(name = "messageSource")
    public MessageSource messageSource() {

        ReloadableResourceBundleMessageSource messageSource = new ReloadableResourceBundleMessageSource();
        messageSource.setBasename("/i18n/messages");
        messageSource.setFallbackToSystemLocale(false);
        messageSource.setCacheSeconds(0);
        messageSource.setDefaultEncoding("UTF-8");

        return messageSource;
    }

    @Bean(name="localeResolver")
    public LocaleResolver localeResolver(){
        SessionLocaleResolver  resolver = new SessionLocaleResolver();
        resolver.setDefaultLocale(new Locale("pt", "BR"));
        return resolver;
    } 

    @Bean
    public UrlTemplateResolver urlTemplateResolver() {
        return new UrlTemplateResolver();
    }

    // other beans and configs
}

应用程序的总体视图是：

messages_pt_BR.properties 文件是：

#messages
spring.messages.basename=i18n/messages

app.name=APPLICATION NAME

但是，当我尝试在页面上的某处显示 APPLICATION NAME 时，使用以下代码：

<p th:text="#{app.name}">app.name</p>

我只得到

??app.name_pt_BR??

我浏览了许多可能的解决方案和教程，包括：

I18n in Spring boot + Thymeleaf http://www.concretepage.com/spring-4/spring-4-mvc-internationalization-i18n-and-localization-l10n-annotation-example How to display messages in Thymeleaf and Spring Boot?

我还是不能让它工作。

浏览器和操作系统设置为语言环境 en_US。

如何解决？

Answer 1

我在这个问题上找到了我的问题的答案：

Spring 4 with thymeleaf Internationalization not identify message from resource properties file

基本上，解决问题的方法是将以下@Bean...

@Bean
public ViewResolver viewResolver() {
    ServletContextTemplateResolver templateResolver = new ServletContextTemplateResolver();
    templateResolver.setTemplateMode("HTML5");
    templateResolver.setCharacterEncoding("UTF-8");
    templateResolver.setPrefix("/WEB-INF/html/");
    templateResolver.setSuffix(".html");

    SpringTemplateEngine engine = new SpringTemplateEngine();
    engine.addDialect(new SpringSecurityDialect());
    engine.addDialect(new LayoutDialect(new GroupingStrategy()));
    engine.setTemplateResolver(templateResolver);

    ThymeleafViewResolver viewResolver = new ThymeleafViewResolver();
    viewResolver.setTemplateEngine(engine);
    viewResolver.setCache(false);

    return viewResolver;
}

... 分成三个不同的 bean，例如：

@Bean
public ServletContextTemplateResolver templateResolver() {
    ServletContextTemplateResolver templateResolver = new ServletContextTemplateResolver();
    templateResolver.setCacheable(false);
    templateResolver.setTemplateMode("HTML5");
    templateResolver.setCharacterEncoding("UTF-8");
    templateResolver.setPrefix(HTML_VIEWS);
    templateResolver.setSuffix(".html");

    return templateResolver;
}

@Bean
public SpringTemplateEngine templateEngine() {
    SpringTemplateEngine templateEngine = new SpringTemplateEngine();
    templateEngine.addDialect(new SpringSecurityDialect());
    templateEngine.addDialect(new LayoutDialect(new GroupingStrategy()));
    templateEngine.setTemplateResolver(templateResolver());

    return templateEngine;
}

@Bean
public ViewResolver viewResolver() {

    ThymeleafViewResolver viewResolver = new ThymeleafViewResolver();
    viewResolver.setTemplateEngine(templateEngine());
    viewResolver.setCharacterEncoding("UTF-8");
    viewResolver.setCache(false);
    viewResolver.setOrder(1);

    return viewResolver;
}

从那以后，我得到了它按预期工作。

感谢您的见解和帮助！

Answer 2

在这里使用 Spring Boot，但我能够重现您的问题，并且一旦我将其更改为 ResourceBundleMessageSource，它就与 ReloadableResourceBundleMessageSource 相关联，它就可以正常工作。

@Bean(name = "messageSource")
public MessageSource messageSource() {

    ResourceBundleMessageSource messageSource = new ResourceBundleMessageSource();
    messageSource.setBasename("/i18n/messages");
    messageSource.setFallbackToSystemLocale(false);
    messageSource.setCacheSeconds(0);
    messageSource.setDefaultEncoding("UTF-8");

    return messageSource;
}

更新：

发现您需要为 ReloadableReourceBundleMessageSource 提供完整路径，因此如果您的 /il8n 目录在您的类路径中，您需要将您的基本名称设置为 classpath:/il8n/messages

在这里查看我的帖子：Why does Thymeleaf International only works with ResourceBundleMessageSource

Answer 3

 @Bean(name="localeResolver")
    public LocaleResolver localeResolver(){
        SessionLocaleResolver  resolver = new SessionLocaleResolver();
        resolver.resolver.setDefaultLocale(new Locale("en"));
        return resolver;
    }  

更改了您的 localresolver bean，这可能会对您有所帮助。如果您将浏览器设置为en locale，应用程序如何读取pt_BR，将其更改为味精属性文件中的_en

或者您可以将浏览器区域设置更改为Portuguese - BRAZIL (BR) (pt_BR)，而无需在任何地方更改代码