Java 在 LocalDate 和 XMLGregorianCalendar 之间转换
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Convert between LocalDate and XMLGregorianCalendar
提问by maja
What's the best way to convert between LocalDatefrom Java 8 and XMLGregorianCalendar?
在LocalDateJava 8 和之间进行转换的最佳方法是XMLGregorianCalendar什么？
采纳答案by JodaStephen
Converting from LocalDateto XMLGregorianCalendar:
转换LocalDate为XMLGregorianCalendar：
LocalDate date = LocalDate.now();
GregorianCalendar gcal = GregorianCalendar.from(date.atStartOfDay(ZoneId.systemDefault()));
XMLGregorianCalendar xcal = DatatypeFactory.newInstance().newXMLGregorianCalendar(gcal);
Converting back is simpler:
转换回来更简单：
xcal.toGregorianCalendar().toZonedDateTime().toLocalDate();
回答by maja
To convert from LocalDateto XMLGregorianCalendaryou can use
要从转换LocalDate为XMLGregorianCalendar您可以使用
LocalDate localDate = ...;
GregorianCalendar calender = new GregorianCalendar();
Date utilDate = Date.from( localDate.atStartOfDay( ZoneId.systemDefault() ).toInstant() );
calender.setTime(utilDate);
XMLGregorianCalendar xmlCal = DatatypeFactory.newInstance().newXMLGregorianCalendar(calender);
And to convert XMLGregorianCalendarback to LocalDate:
并转换XMLGregorianCalendar回LocalDate：
XMLGregorianCalendar xmlCal = ...;
Date utilDate = xmlCal.toGregorianCalendar().getTime();
LocalDate localDate = LocalDateTime.ofInstant( utilDate.toInstant(), ZoneId.systemDefault() ).toLocalDate();
回答by riskop
The LocalDate stores only year/month/day information. There is no time nor time-zone information in it. The XMLGregorianCalendar stores date (year/month/day) + optionallytime and optionallytime zone information.
LocalDate 仅存储年/月/日信息。其中没有时间或时区信息。XMLGregorianCalendar 存储日期（年/月/日）+可选的时间和可选的时区信息。
So converting from LocalDate to XMLGregorianCalendar is simple:
所以从 LocalDate 转换为 XMLGregorianCalendar 很简单：
LocalDate in;
XMLGregorianCalendar out;
in = LocalDate.parse("1999-11-11");
out = DatatypeFactory.newInstance().newXMLGregorianCalendar(in.toString());
Converting from XMLGregorianCalendar to LocalDate might be not so simple, because XMLGregorianCalendar mayhave time and time-zone information which you simply can't store in LocalDate.
从 XMLGregorianCalendar 转换为 LocalDate 可能不是那么简单，因为 XMLGregorianCalendar可能包含您根本无法存储在 LocalDate 中的时间和时区信息。
However, I guess that if you are converting from XMLGregorianCalendar to LocalDate then the XMLGregorianCalendar is resulting from a nontimezoned xsd:date element (represented as YYYY-MM-DD in the xml). In that case you should convert it like this:
但是，我想如果您从 XMLGregorianCalendar 转换为 LocalDate 那么 XMLGregorianCalendar 是由非时区 xsd:date 元素（在 xml 中表示为 YYYY-MM-DD）产生的。在这种情况下，您应该像这样转换它：
XMLGregorianCalendar in;
LocalDate out;
in = DatatypeFactory.newInstance().newXMLGregorianCalendar("2011-11-11");
out = LocalDate.parse(in.toXMLFormat());
Whole example:
整个例子：
{
LocalDate in;
XMLGregorianCalendar out;
in = LocalDate.parse("1999-11-11");
out = DatatypeFactory.newInstance().newXMLGregorianCalendar(in.toString());
System.out.println("in: " + in.toString());
System.out.println("out: " + out.toXMLFormat());
}
{
XMLGregorianCalendar in;
LocalDate out;
in = DatatypeFactory.newInstance().newXMLGregorianCalendar("2011-11-11");
out = LocalDate.parse(in.toXMLFormat());
System.out.println("in: " + in.toXMLFormat());
System.out.println("out: " + out.toString());
}
回答by Acanda
The following is a simple way to convert from LocalDate to XMLGregorianCalendar which both preserves the undefined fields (hours, timezone, etc.) and is efficient (i.e. no conversion to/from String). Unlike some of the other solutions this results in XML dates without timezones, e.g. <date>2018-11-06</date>instead of <date>2018-11-06+01:00</date>.
下面是一种从 LocalDate 转换为 XMLGregorianCalendar 的简单方法，它既保留了未定义的字段（小时、时区等），又高效（即不转换为/从字符串）。与其他一些解决方案不同，这会导致没有时区的 XML 日期，例如，<date>2018-11-06</date>而不是<date>2018-11-06+01:00</date>.
LocalDate date = ...;
XMLGregorianCalendar xmlCal = DatatypeFactory.newInstance().newXMLGregorianCalendar();
xmlCal.setYear(date.getYear());
xmlCal.setMonth(date.getMonthValue());
xmlCal.setDay(date.getDayOfMonth());
Converting back is a bit simpler:
转换回来更简单一点：
XMLGregorianCalendar xmlCal = ...
LocalDate date = LocalDate.of(xmlCal.getYear(), xmlCal.getMonth(), xmlCal.getDay());
