Question

我正在使用Jackson将POJO序列化为JSON，但是日期格式化有困难。我在杰克逊的网站上遇到过这个维基：http://wiki.fasterxml.com/JacksonFAQDateHandling

通过这篇文章，我做了以下事情：

objectMapper.configure(SerializationConfig.Feature.WRITE_DATES_AS_TIMESTAMPS, false);

以ISO-8601格式打印Date对象，这就是我想要的。除了＆＃34; + 0000＆＃34;。根据ISO-8601格式，+ hhmm是与UTC的时间偏移。杰克逊有没有办法禁用时间偏移？或者我只需要指定自定义日期格式吗？

Answer 1

我认为最好的办法是在序列化时传递新的日期格式。例如：

final ObjectMapper objectMapper = new ObjectMapper();
objectMapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd'T'HH:mm"));

基于JavaDocs on github可以深入了解如何确定日期格式，而无需指定自己的格式，我认为您只能使用数字时间戳或Jackson定义的内置ISO格式。文件供参考：

/**
     * Feature that determines whether Date (and date/time) values
     * (and Date-based things like {@link java.util.Calendar}s) are to be
     * serialized as numeric timestamps (true; the default),
     * or as something else (usually textual representation).
     * If textual representation is used, the actual format is
     * one returned by a call to
     * {@link com.fasterxml.jackson.databind.SerializationConfig#getDateFormat}:
     * the default setting being {@link com.fasterxml.jackson.databind.util.StdDateFormat},
     * which corresponds to format String of "yyyy-MM-dd'T'HH:mm:ss.SSSZ"
     * (see {@link java.text.DateFormat} for details of format Strings).
     *<p>
     * Note: whether this feature affects handling of other date-related
     * types depend on handlers of those types, although ideally they
     * should use this feature
     *<p>
     * Note: whether {@link java.util.Map} keys are serialized as Strings
     * or not is controlled using {@link #WRITE_DATE_KEYS_AS_TIMESTAMPS}.
     *<p>
     * Feature is enabled by default, so that date/time are by default
     * serialized as timestamps.
     */
    WRITE_DATES_AS_TIMESTAMPS(true),

杰克逊 - 序列化日期对象

1 个答案: