SpringBoot如何根据用户系统时区动态展示时间

Intl.DateTimeFormat().resolvedOptions().timeZone; // Asia/Shanghai

public LocalDateTime convertLocalDateTime(LocalDateTime localDateTime, ZoneId originZoneId,
			ZoneId targetZoneId)
{
	return localDateTime.atZone(originZoneId).withZoneSameInstant(targetZoneId).toLocalDateTime();
}

@Configuration
public class JacksonConfiguration
{
	@Autowired
	private JacksonProperties jacksonProperties;	/**
	 * 时区转换
	 * 
	 * @param localDateTime
	 * @param originZoneId
	 * @param targetZoneId
	 * @return
	 */
	public static LocalDateTime convertLocalDateTime(LocalDateTime localDateTime, ZoneId originZoneId,
			ZoneId targetZoneId)
	{
		return localDateTime.atZone(originZoneId).withZoneSameInstant(targetZoneId).toLocalDateTime();
	}	/**
	 * LocalDateTime序列化
	 */
	public static class CustomLocalDateTimeSerializer extends JsonSerializer<LocalDateTime>
	{
		private DateTimeFormatter formatter;		public CustomLocalDateTimeSerializer(DateTimeFormatter formatter)
		{
			super();
			this.formatter = formatter;
		}		@Override
		public void serialize(LocalDateTime value, JsonGenerator generator, SerializerProvider provider)
				throws IOException
		{
			generator.writeString(convertLocalDateTime(value, ZoneId.of("Asia/Shanghai"), ZoneId.of("Africa/Sao_Tome"))
					.format(formatter));
		}	}	/**
	 * LocalDateTime反序列化
	 * 
	 */
	public static class CustomLocalDateTimeDeserializer extends JsonDeserializer<LocalDateTime>
	{
		private DateTimeFormatter formatter;		public CustomLocalDateTimeDeserializer(DateTimeFormatter formatter)
		{
			super();
			this.formatter = formatter;
		}		@Override
		public LocalDateTime deserialize(JsonParser parser, DeserializationContext context)
				throws IOException, JacksonException
		{
			return convertLocalDateTime(LocalDateTime.parse(parser.getText(), formatter), ZoneId.of("Africa/Sao_Tome"),
					ZoneId.of("Asia/Shanghai"));
		}	}	@Bean
	public Jackson2ObjectMapperBuilderCustomizer jackson2ObjectMapperBuilderCustomizer()
	{
		return builder ->
		{
			builder.serializerByType(LocalDateTime.class,
					new CustomLocalDateTimeSerializer(DateTimeFormatter.ofPattern(jacksonProperties.getDateFormat())));
			builder.deserializerByType(LocalDateTime.class,
					new CustomLocalDateTimeDeserializer(DateTimeFormatter.ofPattern(jacksonProperties.getDateFormat())));
		};
	}
}

@Configuration
public class WebMvcConfiguration implements WebMvcConfigurer
{
	@Autowired
	private WebMvcProperties webMvcProperties;	@Override
	public void addFormatters(FormatterRegistry registry)
	{
		registry.addConverter(new Converter<String, LocalDateTime>()
		{			private LocalDateTime convertLocalDateTime(LocalDateTime localDateTime, ZoneId originZoneId,
					ZoneId targetZoneId)
			{
				return localDateTime.atZone(originZoneId).withZoneSameInstant(targetZoneId).toLocalDateTime();
			}			@Override
			public LocalDateTime convert(String source)
			{
				return convertLocalDateTime(
						LocalDateTime.parse(source,
								DateTimeFormatter.ofPattern(webMvcProperties.getFormat().getDateTime())),
						ZoneId.of("Africa/Sao_Tome"), ZoneId.of("Asia/Shanghai"));
			}		});
	}}