Java 8 DateTime序列化和Jackson JSR310

Question

我在一个Spring Boot应用程序中使用Java8DateTime和Jackson JSR310支持。

我禁用了SerializationFeature.write_dates_as_timestamps以强制Jackson将localDatetime序列化为字符串而不是int数组。

private LocalDateTime date;

private OffsetDateTime offsetDate;

private ZonedDateTime zonedDate;

@Before
public void setup() throws ServletException {
    date = LocalDateTime.of(2015, 8, 15, 11, 40, 10, 100_000_000);
    offsetDate = OffsetDateTime.of(2015, 8, 15, 11, 40, 10, 100_000_000, ZoneOffset.ofHours(8));
    zonedDate = ZonedDateTime.of(2015, 8, 15, 11, 40, 10, 100_000_000, ZoneId.of("Asia/Shanghai"));
}

@Test
public void testDateFormat() throws Exception {
    Map<String, Object> map = new HashMap<>();
    map.put("localDate", date);
    map.put("offsetDate", offsetDate);
    map.put("zonedDate", zonedDate);

    String json = objectMapper.writeValueAsString(map);

    log.debug("converted html" target="_blank">json result @" + json);

    JsonNode rootNode = objectMapper.readTree(json);

    JsonNode localDateNode = rootNode.get("localDate");
    assertEquals("local date should be equals", date.format(DateTimeFormatter.ISO_LOCAL_DATE_TIME), localDateNode.textValue());

    JsonNode offsetDateNode = rootNode.get("offsetDate");
    assertEquals("offsetDate date should be equals", offsetDate.format(DateTimeFormatter.ISO_OFFSET_DATE_TIME), offsetDateNode.textValue());

    JsonNode zonedDateNode = rootNode.get("zonedDate");
    assertEquals("zonedDate date should be equals", zonedDate.format(DateTimeFormatter.ISO_ZONED_DATE_TIME), zonedDateNode.textValue());

}

{
    "zonedDate":"2015-08-15T11:40:10.100+08:00[Asia/Shanghai]",
    "localDate":"2015-08-15T11:40:10.100",
    "offsetDate":"2015-08-15T11:40:10.1+08:00"
}

format,toString,json文本的打印结果

LocalDateTime format(DateTimeFormatter.ISO_LOCAL_DATE_TIME)@2015-08-15T11:40:10.1
LocalDateTime toString                                     @2015-08-15T11:40:10.100
LocalDateTime serialized json node text                    @2015-08-15T11:40:10.100
OffsetDateTime format(DateTimeFormatter.ISO_OFFSET_DATE_TIME)@2015-08-15T11:40:10.1+08:00
OffsetDateTime toString                                      @2015-08-15T11:40:10.100+08:00
OffsetDateTime serialized json node text                     @2015-08-15T11:40:10.1+08:00
ZonedDateTime format(DateTimeFormatter.ISO_ZONED_DATE_TIME)@2015-08-15T11:40:10.1+08:00[Asia/Shanghai]
ZonedDateTime toString                                     @2015-08-15T11:40:10.100+08:00[Asia/Shanghai]
ZonedDateTime serialized json node text                    @2015-08-15T11:40:10.100+08:00[Asia/Shanghai]

1. 似乎toString结果应该是Jackson序列化中所需的结果，在上面的日志记录中，OffsetDateTime json节点微秒文本应该以00结束。
2. 为什么格式化方法的结果省略了结尾的00？

完整的示例代码可以从我的GitHub.com找到。

ISODATETEST

Answer 1

作为解决办法，我添加了自己的序列化程序：

    ObjectMapper objectMapper = new ObjectMapper();
    objectMapper.registerModule(new JavaTimeModule());
    SimpleModule module = new SimpleModule();
    module.addSerializer(ZonedDateTime.class, new JsonSerializer<ZonedDateTime>() {
        @Override
        public void serialize(ZonedDateTime zonedDateTime, JsonGenerator jsonGenerator, SerializerProvider serializerProvider) throws IOException, JsonProcessingException {
            jsonGenerator.writeString(DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss.SSSZZZ").format(zonedDateTime));
        }
    });
    objectMapper.registerModule(module);
    objectMapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
    objectMapper.enable(SerializationFeature.INDENT_OUTPUT);