这个配置可以使得springboot支持从yml文件读取string自定转换为ZonedDateTime

  @Bean
  public ConversionService conversionService() {
    FormattingConversionServiceFactoryBean factory = new FormattingConversionServiceFactoryBean();
    DateTimeFormatterRegistrar registrar = new DateTimeFormatterRegistrar();
    registrar.setUseIsoFormat(true);
    factory.setFormatterRegistrars(Collections.singleton(registrar));
    factory.afterPropertiesSet();
    return factory.getObject();
  }