Spring 国际化@Autowired MessageSource 配置文件读取顺序

代码逻辑示例

{
        // 遍历循环配置文件basename集合.
        for (String baseName : Arrays.asList("spring.messages.basename")){
            /**
             * 根据 locale 遍历父级的locale对象,
             * {@link ResourceBundle.Control.CandidateListCache#createObject(sun.util.locale.BaseLocale)}
             * {@link ResourceBundle.Control.CandidateListCache#getDefaultList(java.lang.String, java.lang.String, java.lang.String, java.lang.String)}
             * 当父级遍历完毕, 设置当前locale对象为系统默认locale对象.
             * {@link ResourceBundleMessageSource#resolveCodeWithoutArguments(java.lang.String, java.util.Locale)}
              */
            for (String locale : Arrays.asList("locale", "parentLocale", "defaultLocale", "defaultParentLocale")) {
		// 如果当前keySet集合存在该元素则返回对应数据并结束遍历.
                if (ResourceBundle.getBundle(baseName, Locale.forLanguageTag(locale)).keySet().contains("目标读取key")) {
                    return ResourceBundle.getBundle(baseName, Locale.forLanguageTag(locale)).getString("目标读取key");
                }
            }
        }
        return "默认值";
    }

效果展示

spring.messages.basename=i18n/messages,other,messages
当前配置文件:
resources/i18n/messages.properties
resources/i18n/messages_en.properties
resources/i18n/messages_ja_JP.properties
resources/i18n/messages_zh.properties
resources/i18n/messages_zh_CN.properties
resources/messages.properties
resources/messages_en.properties
resources/messages_ja_JP.properties
resources/messages_zh.properties
resources/messages_zh_CN.properties
resources/other.properties
resources/other_en.properties
resources/other_ja_JP.properties
resources/other_zh.properties
resources/other_zh_CN.properties

en-US读取配置顺序:i18n/messages_en_US.properties
en-US读取配置顺序:i18n/messages_en.properties
en-US读取配置顺序:i18n/messages_zh_CN.properties
en-US读取配置顺序:i18n/messages_zh.properties
en-US读取配置顺序:i18n/messages.properties
en-US读取配置顺序:other_en_US.properties
en-US读取配置顺序:other_en.properties
en-US读取配置顺序:other_zh_CN.properties
en-US读取配置顺序:other_zh.properties
en-US读取配置顺序:other.properties
en-US读取配置顺序:messages_en_US.properties
en-US读取配置顺序:messages_en.properties
en-US读取配置顺序:messages_zh_CN.properties
en-US读取配置顺序:messages_zh.properties
en-US读取配置顺序:messages.properties


ja读取配置顺序:i18n/messages_ja.properties
ja读取配置顺序:i18n/messages_zh_CN.properties
ja读取配置顺序:i18n/messages_zh.properties
ja读取配置顺序:i18n/messages.properties
ja读取配置顺序:other_ja.properties
ja读取配置顺序:other_zh_CN.properties
ja读取配置顺序:other_zh.properties
ja读取配置顺序:other.properties
ja读取配置顺序:messages_ja.properties
ja读取配置顺序:messages_zh_CN.properties
ja读取配置顺序:messages_zh.properties
ja读取配置顺序:messages.properties```

源码示例

遍历basename源代码: org.springframework.context.support.ResourceBundleMessageSource#resolveCodeWithoutArguments

当前baseName获取不到对应的bundle 则根据默认的locale进行取值.

填充locale的父级locale源代码: java.util.ResourceBundle.Control.CandidateListCache#getDefaultList