https://blog.csdn.net/liujun03/article/details/82775634

一、国际化基本原理

在Spring程序中，国际化主要是通过ResourceBundleMessageSource这个类来实现的，那么下面我们分析一下Spring Boot是如何实现国际化支持的。

Spring Boot通过MessageSourceAutoConfiguration是为我们自动配置好了管理国际化资源文件的组件的: org.springframework.boot.autoconfigure.context.MessageSourceAutoConfiguration

@Bean@ConfigurationProperties(    prefix = "spring.messages")public MessageSourceProperties messageSourceProperties() {    return new MessageSourceProperties();}@Beanpublic MessageSource messageSource() {    MessageSourceProperties properties = this.messageSourceProperties(); //private String basename = "messages";    ResourceBundleMessageSource messageSource = new ResourceBundleMessageSource();    if (StringUtils.hasText(properties.getBasename())) {        messageSource.setBasenames(StringUtils.commaDelimitedListToStringArray(StringUtils.trimAllWhitespace(properties.getBasename())));    }    if (properties.getEncoding() != null) {        messageSource.setDefaultEncoding(properties.getEncoding().name());    }    messageSource.setFallbackToSystemLocale(properties.isFallbackToSystemLocale());    Duration cacheDuration = properties.getCacheDuration();    if (cacheDuration != null) {        messageSource.setCacheMillis(cacheDuration.toMillis());    }    messageSource.setAlwaysUseMessageFormat(properties.isAlwaysUseMessageFormat());    messageSource.setUseCodeAsDefaultMessage(properties.isUseCodeAsDefaultMessage());    return messageSource;}