Json 我如何反序列化以杰克逊为单位的时间戳

发布于12月17日

我有一些JSON的时间戳是秒(即Unix时间戳):

{"foo":"bar","timestamp":1386280997}

要求Jackson将其反序列化为一个带有时间戳DateTime字段的对象，结果是1970-01-17T01:11:25.983Z，即纪元后不久的时间，因为Jackson假定它是milliseconds.除了撕开JSON并添加一些零，我怎样才能让Jackson理解seconds时间戳呢？

推荐答案

I wrote a custom deserializer to handle timestamps in seconds (Groovy syntax).

class UnixTimestampDeserializer extends JsonDeserializer<DateTime> {
    Logger logger = LoggerFactory.getLogger(UnixTimestampDeserializer.class)

    @Override
    DateTime deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException, JsonProcessingException {
        String timestamp = jp.getText().trim()

        try {
            return new DateTime(Long.valueOf(timestamp + '000'))
        } catch (NumberFormatException e) {
            logger.warn('Unable to deserialize timestamp: ' + timestamp, e)
            return null
        }
    }
}

And then I annotated my POGO to use that for the timestamp:

class TimestampThing {
    @JsonDeserialize(using = UnixTimestampDeserializer.class)
    DateTime timestamp

    @JsonCreator
    public TimestampThing(@JsonProperty('timestamp') DateTime timestamp) {
        this.timestamp = timestamp
    }
}