Joda-Time中的自由日期/时间解析 [英] Liberal date/time parsing in Joda-Time

问题描述

是否可以创建一个可以解析的DateTimeParser:

Is it possible to create a single DateTimeParser which would parse:

• 有时间的日期
• 没有时间的日期(假设时间是一天的开始)
• 没有日期的时间(假设日期是今天)

还是我需要拥有三个单独的解析器，并尝试分别解析一个字符串?

or do I need to have three separate parsers, and try parsing strings with each one?

换句话说，是否可以在解析器中定义可选字段?

In other words, is it possible to define optional fields in a parser?

推荐答案

org.joda.time.format.ISODateTimeFormat具有基于DateTimeFomatterBuilder类的静态方法dateOptionalTimeParser()，该方法使用下面的代码，该类具有appendOptional方法-您可能可以使该方法适应您的要求...链接:

org.joda.time.format.ISODateTimeFormat has a static method dateOptionalTimeParser() that uses the code below, based on the DateTimeFomatterBuilder class, which has an appendOptional method - you would probably be able to adapt the method to your requirement... Link: http://joda-time.sourceforge.net/apidocs/org/joda/time/format/DateTimeFormatterBuilder.html

public static DateTimeFormatter dateOptionalTimeParser() {
    if (dotp == null) {
        DateTimeParser timeOrOffset = new DateTimeFormatterBuilder()
            .appendLiteral('T')
            .appendOptional(timeElementParser().getParser())
            .appendOptional(offsetElement().getParser())
            .toParser();
        dotp = new DateTimeFormatterBuilder()
            .append(dateElementParser())
            .appendOptional(timeOrOffset)
            .toFormatter();
    }
    return dotp;
}

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