SOAP Web Service parsing Date from String returnin

I'm using org.apache.cxf.xjc.runtime.DataTypeAdapter.parseDate(StringDate) to parse the input string date from XML to JAVA date. But i got a Date objects with day-1 value.

For example

<birth>1939-11-19+01:00</birth>

I want to ignore the offset. I want only the date, so no matter what the offset is, I should get

Sun Nov 19 00:00:00 CET 1939

But I do get:

Sat Nov 18 23:00:00 CET 1939

The issue is at the level of date's time offset. I tried to fix it with ignoring the time offset but that didn't work. I'm using java 6 (constraint project). Any ideas?

My best attempt at a minimal, complete and verifiable example:

public static Date parse(final String str) {
    Calendar c = DatatypeConverter.parseDateTime(str);
    System.out.println(str + "\t" + c.getTime().getTime() / 1000);
    return c.getTime();
}

标签： xml date timezone cxf java-6

1条回答

爱情/是我丢掉的垃圾

2楼-- · 2019-08-27 04:18

java.time

    String birth = "1939-11-19+01:00";
    LocalDate date = LocalDate.parse(birth, DateTimeFormatter.ISO_OFFSET_DATE);
    System.out.println(date);

This prints

1939-11-19

A java.time.LocalDate is a date without time-of-day, so this matches your requirements exactly. At the same time java.util.Date and friends are long outdated and have proven poorly designed. java.time, the modern Java date and time API, is so much nicer to work with. So my first recommendation is you stop here.

If you do need a Date, for example for a legacy API, first realize that despite the name it does not represent a date. It represents a point in time, and at that point in time the date will not be the same everywhere. This probably caused your problem, as you are aware: parseDate and parseDateTime parse your string into 00:00 at the specified offset from UTC on the date in question. At this point in time, the date may not be the same in your time zone, so when you print the Date you get, thereby invoking its toString method, you may get a different date. I understand that you want the time at 0:00 in your own time zone instead (CET, probably Central European Time, in turn a name of several different time zones that may be at offsets 0 or +01 on that date in 1939; the result you observed would make sense in time zones Europe/Paris, Africa/Ceuta, Europe/Andorra, Europe/Madrid and Europe/Monaco, all of which were at offset 0). To convert:

    Date oldfashionedDateObject 
            = Date.from(date.atStartOfDay(ZoneId.systemDefault()).toInstant());
    System.out.println(oldfashionedDateObject);

This printed

Sun Nov 19 00:00:00 CET 1939

I tested with my time zone set to America/New_York and to Europe/Moscow, and always got Sun Nov 19 00:00:00, only in different time zones, EST and MSK.

Java 6 and ThreeTen Backport

I understand that you have to use Java 6. java.time has been backported to Java 6 and 7 in the ThreeTen Backport. So get this from the link at the bottom and add it to your project, and the above code will work except the conversion happens a little differently:

    Date oldfashionedDateObject
            = DateTimeUtils.toDate(date.atStartOfDay(ZoneId.systemDefault()).toInstant());

You don’t need to rewrite all of your code to use the ThreeTen Backport, and especially not if there are parts where you don’t trust the modern API to behave the way you want. The above snippet can coexist nicely with the code you already have.

The really really old-fashioned way

If you really insist, the way I could find to get the Date you want using DatatypeConverter and Calendar:

    Calendar calWithParsedOffset = DatatypeConverter.parseDate(birth);
    Calendar calWithMyTimeZone = Calendar.getInstance(TimeZone.getDefault());
    calWithMyTimeZone.clear();
    calWithMyTimeZone.set(calWithParsedOffset.get(Calendar.YEAR),
            calWithParsedOffset.get(Calendar.MONTH),
            calWithParsedOffset.get(Calendar.DAY_OF_MONTH));
    Date oldfashionedDateObject = calWithMyTimeZone.getTime();
    System.out.println(oldfashionedDateObject);

We can’t just change the offset or time zone of the Calendar we got from parsing since this will not change its point in time and therefore not the Date object we get. Instead we need to set a different Calendar object to the year, month and day-of-month of the first Calendar. The call to clear() sets hours, minutes, seconds and milliseconds to 0. This snippet too has been tested with my JVM’s time zone set to America/New_York and to Europe/Moscow.