Spring Boot国际化i18n配置指南

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.support.ResourceBundleMessageSource;
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;
 
@Configuration
public class I18nConfig {
 
    @Bean
    public WebMvcConfigurer localeInterceptor() {
        return new WebMvcConfigurer() {
            @Override
            public void addInterceptors(InterceptorRegistry registry) {
                LocaleChangeInterceptor localeInterceptor = new LocaleChangeInterceptor();
                localeInterceptor.setParamName("lang");
                registry.addInterceptor(localeInterceptor);
            }
        };
    }
 
    @Bean
    public ResourceBundleMessageSource messageSource() {
        ResourceBundleMessageSource messageSource = new ResourceBundleMessageSource();
        messageSource.setBasename("messages");
        messageSource.setDefaultEncoding("UTF-8");
        return messageSource;
    }
 
    @Bean
    public SessionLocaleResolver localeResolver() {
        return new SessionLocaleResolver();
    }
}

这段代码定义了一个配置类I18nConfig，其中包含了国际化功能的三个核心组件：LocaleChangeInterceptor、ResourceBundleMessageSource和SessionLocaleResolver。通过addInterceptors方法，我们可以根据请求中的参数改变会话的区域设置，从而实现语言的切换。ResourceBundleMessageSource则用于查找国际化消息，而SessionLocaleResolver则用于在会话中解析区域设置信息。这个配置类可以直接用于Spring Boot项目中，简化了国际化的配置流程。