JodaTime 节目持续数周答案

【问题标题】：JodaTime show weeks in durationJodaTime 节目持续数周
【发布时间】：2017-05-06 12:59:38
【问题描述】：

我正在尝试以以下格式显示两个 DateTimes 之间的时间差：

? years, ? months, ? weeks, ? days, ? hours, ? minutes, ? seconds and ? milliseconds

我几乎可以这样显示它，但是它不显示星期。我曾尝试使用 PeriodType.standard()，但省略了几个月和几年。可以这样做吗？

这是我用来实现当前结果的代码：

private String getPeriodBetween(DateTime from, DateTime to, boolean showMilliseconds) {
    Period period;

    if (from.isAfter(to)) {
        period = new Period(to, from);
    } else {
        period = new Period(from, to);
    }

    PeriodFormatterBuilder builder = new PeriodFormatterBuilder().appendYears()
        .appendSuffix(" year, ", " years, ")
        .appendMonths()
        .appendSuffix(" month, ", " months, ")
        .appendWeeks()
        .appendSuffix(" week, ", " weeks, ")
        .appendDays()
        .appendSuffix(" day, ", " days, ")
        .appendHours()
        .appendSuffix(" hour, ", " hours, ")
        .appendMinutes()
        .appendSuffix(" minute, ", " minutes, ")
        .appendSeconds()
        .appendSuffix(" second, ", " seconds, ");

    if (showMilliseconds) {
        builder = builder.appendMillis().appendSuffix(" millisecond", " milliseconds");
    }

    return builder.toFormatter()
        .print(period.normalizedStandard(PeriodType.yearMonthDayTime()))
        .replaceAll("[,]\\s*$", "")
        .replaceAll("(?:,\\s*)([^,]+)$", " and $1")
        .replaceAll("^(?![\\s\\S])", "No difference");
}

如果我使用PeriodType.forFields(); 并指定一个包含所有必填字段的DurationFieldType 数组，则会省略年份和月份。

【问题讨论】：

标签： java datetime jodatime duration

【解决方案1】：

想通了。问题是我最初使用Duration 并将其转换为Period。我曾尝试使用以下代码来修复它，但它并没有给我预期的结果。将其更改为Period 后，我可以使用Period.forFields(); 指定我需要的所有字段，接受以下内容：

private static final DurationFieldType[] DURATION_FIELD_TYPES = {
    DurationFieldType.years(),
    DurationFieldType.months(),
    DurationFieldType.weeks(),
    DurationFieldType.days(),
    DurationFieldType.hours(),
    DurationFieldType.minutes(),
    DurationFieldType.seconds(),
    DurationFieldType.millis(),
};

没关系，您甚至不需要对标准进行规范化，因为默认情况下它已经包含所有字段。现在回想起来，还是有道理的。这是我的完整工作代码供参考：

private String getDifference(DateTime from, DateTime to, boolean showMilliseconds) {
    Period period;

    if (from.isAfter(to)) {
        period = new Period(to, from);
    } else {
        period = new Period(from, to);
    }

    PeriodFormatterBuilder builder = new PeriodFormatterBuilder()
        .appendYears()
        .appendSuffix(" year, ", " years, ")
        .appendMonths()
        .appendSuffix(" month, ", " months, ")
        .appendWeeks()
        .appendSuffix(" week, ", " weeks, ")
        .appendDays()
        .appendSuffix(" day, ", " days, ")
        .appendHours()
        .appendSuffix(" hour, ", " hours, ")
        .appendMinutes()
        .appendSuffix(" minute, ", " minutes, ")
        .appendSeconds()
        .appendSuffix(" second, ", " seconds, ");

    if (showMilliseconds) {
        builder = builder.appendMillis().appendSuffix(" millisecond", " milliseconds");
    }

    return builder
        .toFormatter()
        .print(period)
        .replaceAll("[,]\\s*$", "")
        .replaceAll("(?:,\\s*)([^,]+)$", " and $1")
        .replaceAll("^(?![\\s\\S])", "No difference");
}

【讨论】：