public class LocaleSetting implements LocaleResolver {
	@Override
	  public Locale resolveLocale(HttpServletRequest request) {
		/**
     * l=('en_US) 取得連接字符串
     */
		String lstr = request.getParameter("l");
		Locale locale = Locale.getDefault();
		if(!StringUtils.isEmpty(lstr)){
			String[] split = lstr.split("_");
			locale = new Locale(split[0],split[1]);
		}
		return locale;
	}
	@Override
	  public void setLocale(HttpServletRequest request, HttpServletResponse response, Locale locale) {
	}
}

public class AppConfig extends WebMvcConfigurationSupport
/**
 * 配置國際化
 */
@Bean
public LocaleResolver initLocale(){
	return new LocaleSetting();
}

/**
   * 攔截器映射
   */
  @Override
  protected void addInterceptors(InterceptorRegistry registry) {
    registry.addInterceptor(localeChangeInterceptor());
    super.addInterceptors(registry);
  }
  /**
   * 配置國際化
   */
  @Bean
  public LocaleResolver localeResolver() {
    SessionLocaleResolver slr = new SessionLocaleResolver();
    // 默認(rèn)使用的語言
    slr.setDefaultLocale(Locale.SIMPLIFIED_CHINESE);
    return slr;
  }

  @Bean
  public LocaleChangeInterceptor localeChangeInterceptor() {
    LocaleChangeInterceptor lci = new LocaleChangeInterceptor();
    // 參數(shù)名 用于區(qū)別使用語言類型
    /**
     * <a class="btn btn-sm" th:href="@{index.html(l='en-US')}" rel="external nofollow" >中文</a>
     * <a class="btn btn-sm" th:href="@{index.html(l='zh-CN')}" rel="external nofollow" >English</a>
     */
    lci.setParamName("l");
    return lci;
  }