尝试解析LocalDateTime时发生异常 [英] Exception when trying to parse a LocalDateTime

问题描述

我正在使用以下时间戳格式:

I am using the following timestamp format:

yyyyMMddHHmmssSSS

以下方法可以正常工作:

The following method works fine:

public static String formatTimestamp(final Timestamp timestamp, final String format) {
    final DateTimeFormatter formatter = DateTimeFormatter.ofPattern(format);
    return timestamp.toLocalDateTime().format(formatter);
}

而且，当我传入带有该格式字符串的时间戳时，它返回，例如:

And, when I pass in a Timestamp with that format string, it returns, for example:

20170925142051591

然后我需要再次从该字符串映射到时间戳，本质上是相反的操作.我知道我可以使用SimpleDateFormat及其parse()方法，但是如果可能的话，我宁愿坚持使用java.time样式格式.

I then require to map from that string to a Timestamp again, essentially the reverse operation. I know that I can use a SimpleDateFormat and its parse() method, but I'd prefer to stick to java.time style formatting, if possible.

我写了这段(有点怪异)的代码，它适用于某些格式，但不适用于这种特定格式:

I wrote this (rather hacky) bit of code, which works with some formats, but not with this particular one:

public static Timestamp getTimestamp(final String text, final String format, final boolean includeTime) {
    final DateTimeFormatter formatter = DateTimeFormatter.ofPattern(format);
    final TemporalAccessor temporalAccessor = formatter.parse(text);
    if (includeTime) {
        final LocalDateTime localDateTime = LocalDateTime.from(temporalAccessor);
        return DateTimeUtil.getTimestamp(localDateTime);
    } else {
        final LocalDate localDate = LocalDate.from(temporalAccessor);
        return DateTimeUtil.getTimestamp(localDate);
    }
}

在第二行的formatter.parse(text);部分失败.

堆栈跟踪:

java.time.format.DateTimeParseException: Text '20170925142051591' could not be parsed at index 0
    at java.time.format.DateTimeFormatter.parseResolved0(DateTimeFormatter.java:1949)
    at java.time.format.DateTimeFormatter.parse(DateTimeFormatter.java:1851)
    at java.time.LocalDateTime.parse(LocalDateTime.java:492)
    at java.time.LocalDateTime.parse(LocalDateTime.java:477)
    at com.csa.core.DateTimeUtil.main(DateTimeUtil.java:169)

是否有一种更简单的方法可以在不利用SimpleDateFormat的情况下实现我想要的?

Is there a simpler way to achieve what I want without utilising SimpleDateFormat?

推荐答案

是一个错误: https://bugs.openjdk.java.net/browse/JDK-8031085

上面的链接还提供了解决方法:将java.time.format.DateTimeFormatterBuilder与java.time.temporal.ChronoField一起用于毫秒字段:

The link above also provides the workaround: using a java.time.format.DateTimeFormatterBuilder with a java.time.temporal.ChronoField for the milliseconds field:

String text = "20170925142051591";
DateTimeFormatter formatter = new DateTimeFormatterBuilder()
    // date/time
    .appendPattern("yyyyMMddHHmmss")
    // milliseconds
    .appendValue(ChronoField.MILLI_OF_SECOND, 3)
    // create formatter
    .toFormatter();
// now it works
formatter.parse(text);

不幸的是，似乎没有办法仅使用DateTimeFormatter.ofPattern(String)来解析它.

Unfortunately, there seems to be no way to parse this using only DateTimeFormatter.ofPattern(String).

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