将Json Date转换为Java Date并返回至Json Date

问题描述

我在这里仔细检查了所有可能的答案，但是我很难弄清这个问题。

I looked through all possible answer here but I am having hard time to figure this thing out.

我在字符串中有Json日期。我想转换成Java Date而不浪费时间。

I have Json date in a String. I want to convert into a Java Date without losing time.

我也想从Java Date转换为Json Date字符串。

Also I would like to convert from Java Date to Json Date string.

这里是我所拥有的。

String jsonDateString = "/Date(1295157600000-0600)/";

推荐答案

您的时间有两部分：当地时间以毫秒为单位，偏移量以小时和分钟为单位。您必须解析它们并添加它们以获得毫秒级的UTC。

There are 2 parts in your time : the local time in milliseconds, and the offset in hours and minutes. You have to parse them and "add" them to get the milliseconds UTC.

您可以使用以下功能：

private static Pattern p = Pattern.compile("\\((\\d+)([+-]\\d{2})(\\d{2})\\)");
public static Date jd2d(String jsonDateString) {
    Matcher m = p.matcher(jsonDateString);
    if (m.find()) {
        long millis = Long.parseLong(m.group(1));
        long offsetHours = Long.parseLong(m.group(2));
        long offsetMinutes = Long.parseLong(m.group(3));
        if (offsetHours<0) offsetMinutes *= -1;
        return new Date(
            millis
            + offsetHours*60l*60l*1000l
            + offsetMinutes*60l*1000l
        );
    }
    return null;
}

要返回 JSON日期，我只需对UTC时间进行编码：

To make "back" a JSON date, I would simply encode the UTC time :

String jsonDate = "/Date("+date.getTime()+"+0000)/";

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