LocaleDateTime类没有静态字符串格式。它包括几个选项：

• 时-分-日
• 时：分：秒
• 时：分：秒
• 时：分：秒
• 时：分：秒

自定义序列化将帮助您实现静态输出。在下面的例子中，我使用了一个6毫秒数字的格式，就像您的情况一样。

@JsonDeserialize(using = BodyDeserializer.class)
@JsonSerialize(using = BodySerializer.class)
public class Body {

    public static final DATE_FORMAT = DateTimeFormatter.ofPattern("uuuu-MM-dd'T'HH:mm:ss:SSSSSS");
    
    private LocalDateTime myDate;

    public Body(LocalDateTime myDate) {
        this.myDate = myDate;
    }

    public StrLocalDateTimeing getMyDate() { return myDate; }
}

public class BodyDeserializer extends JsonDeserializer {

    @Override
    public User deserialize(JsonParser jsonParser,
            DeserializationContext deserializationContext) throws IOException {
        ObjectCodec oc = jsonParser.getCodec();
        JsonNode node = oc.readTree(jsonParser);
        String date = node.get("myDate");
        LocalDateTime myDate = LocalDateTime.from(Body.DATE_FORMAT.parse(date))
        return new Body(myDate),
    }
}

public class BodySerializer extends JsonSerializer {

    @Override
    public void serialize(Body body, JsonGenerator jsonGenerator,
            SerializerProvider serializerProvider) throws IOException {
        jsonGenerator.writeStartObject();
        
        jsonGenerator.writeNumberField("myDate", Body.DATE_FORMAT.format(body.getMyDate()));
        jsonGenerator.writeEndObject();
    }
}