Spring Boot MVC 项目中的国际化答案

【问题标题】：Internationalization in Spring boot MVC projectSpring Boot MVC 项目中的国际化
【发布时间】：2021-04-17 13:40:53
【问题描述】：

application.properties

spring.messages.basename=i18n/messages

/home/michael/IdeaProjects/adsmanager/application/src/main/resources/i18n/messages_de_DE.properties

greeting=Willkommen!

/home/michael/IdeaProjects/adsmanager/application/src/main/resources/i18n/messages_en_US.properties

greeting=Welcome!

GeneralConfig.java

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.LocaleResolver;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import org.springframework.web.servlet.i18n.LocaleChangeInterceptor;
import org.springframework.web.servlet.i18n.SessionLocaleResolver;

import java.util.Locale;


    @Configuration
    public class GeneralConfig implements WebMvcConfigurer {
        @Bean
        public LocaleResolver localeResolver() {
            SessionLocaleResolver sessionLocaleResolver = new SessionLocaleResolver();
            sessionLocaleResolver.setDefaultLocale(Locale.US);
            return sessionLocaleResolver;
        }
    
        @Bean
        public LocaleChangeInterceptor localeChangeInterceptor() {
            LocaleChangeInterceptor lci = new LocaleChangeInterceptor();
            lci.setParamName("lang");
            return lci;
        }
    
        @Override
        public void addInterceptors(InterceptorRegistry registry) {
            registry.addInterceptor(localeChangeInterceptor());
        }
    
    }

home.html

<div th:text="#{greeting}"></div>

http://localhost:8080/

??greeting_en_US??

http://localhost:8080/?lang=de_DE

??greeting_de_DE??

顺便说一句，我尝试将消息属性直接放置到资源文件夹中，并从 application.properties 中删除 basename 注释。同样的结果。

我该如何解决这个问题？

【问题讨论】：

标签： spring spring-boot

【解决方案1】：

您的应用程序应该扩展 WebMvcConfigurerAdapter

@Configuration
public class GeneralConfig implements WebMvcConfigurerAdapter {
    
    @Bean
    public LocaleResolver localeResolver() {
        SessionLocaleResolver sessionLocaleResolver = new SessionLocaleResolver();
        sessionLocaleResolver.setDefaultLocale(Locale.US);
        return sessionLocaleResolver;
    }

    @Bean
    public LocaleChangeInterceptor localeChangeInterceptor() {
        LocaleChangeInterceptor lci = new LocaleChangeInterceptor();
        lci.setParamName("lang");
        return lci;
    }

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(localeChangeInterceptor());
    }
}

【讨论】：

WebMvcConfigurerAdapter 已弃用。