SpringBoot实现国际化的操作步骤

hello=你好
welcome=欢迎关注公众号, {0}!

hello=hi
welcome=Welcome to follow WeChat Public Number, {0}!

@Resource
private MessageSource messageSource;

@Test
void testMessageSource() {

    Locale china = Locale.CHINA;
    System.out.println("\n中文环境");
    //中文语言
    String hello_zh = messageSource.getMessage("hello", null, china);
    System.out.println(hello_zh);
    // 占位符替换
    String welcome_zh = messageSource.getMessage("welcome", new String[]{"索码理"}, china);
    System.out.println(welcome_zh);

    //英文语言
    Locale english = Locale.ENGLISH;
    System.out.println("\n英文环境");
    String hello_en = messageSource.getMessage("hello", null, english);
    System.out.println(hello_en);
    String welcome_en = messageSource.getMessage("welcome", new String[]{"suncodernote"}, english);
    System.out.println(welcome_en);

    System.out.println("\n没有对应语言的国际化属性，返回code");
    //没有对应语言的国际化属性，返回code
    String hello_test = messageSource.getMessage("hello-test", null, china);
    System.out.println(hello_test);

    System.out.println("\n没有对应语言的国际化区域时，返回默认语言");
    //没有对应语言的国际化区域时，返回默认
    String hello_fr = messageSource.getMessage("hello", null, Locale.FRANCE);
    System.out.println(hello_fr);
}

public interface I18nService {

    /**
     * 获取指定语言所有国际化信息
     * @param locale
     * @return
     */
    Map<String, String> getAllMessages(Locale locale);
}

@Service
public class I18nServiceImpl implements I18nService{

    @Autowired
    private MessageSource messageSource;

    @Override
    public Map<String, String> getAllMessages(Locale locale) {
        if (locale == null) {
            locale = Locale.getDefault();
        }
        //存放所有message
        Map<String, String> messages = new HashMap<>();

        ResourceBundleMessageSource bundleMessageSource = (ResourceBundleMessageSource) messageSource;
        String[] basenames = bundleMessageSource.getBasenameSet().toArray(new String[0]);

        for (String basename : basenames) {
            //从缓存中获取资源文件
            ResourceBundle resourceBundle = ResourceBundle.getBundle(basename, locale);
            //获取资源文件的所有code
            Set<String> keys = resourceBundle.keySet();

            for (String key : keys) {
                //根据code获取对应的message
                String message = messageSource.getMessage(key, null, locale);
                messages.put(key, message);
            }
        }
        return messages;
    }
}

@RequestMapping("/i18n")
@RestController
public class I18nController {

    @Resource
    private I18nService i18nService;

    @RequestMapping("/messages")
    public Map<String, String> getAllMessages(@RequestHeader(name = "Accept-Language" , required = false) Locale locale) {
        return i18nService.getAllMessages(locale);
    }
}