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Formatting date in Apache JsonToStringStyle

I am implementing toString methods for my entities. There are a lot of fields of type ZonedDateTime. Unfortunately, it’s converted to extremely long text representation: 

java.util.GregorianCalendar[
  time=1545826815293,
  areFieldsSet=true,
  areAllFieldsSet=true,
  lenient=true,
  zone=sun.util.calendar.ZoneInfo
  [
    id=
    "UTC",
    offset=0,
    dstSavings=0,
    useDaylight=false,
    transitions=0,
    lastRule=null
  ],
  firstDayOfWeek=1,
  minimalDaysInFirstWeek=1,
  ERA=1,
  YEAR=2018,
  MONTH=11,
  WEEK_OF_YEAR=52,
  WEEK_OF_MONTH=5,
  DAY_OF_MONTH=26,
  DAY_OF_YEAR=360,
  DAY_OF_WEEK=4,
  DAY_OF_WEEK_IN_MONTH=4,
  AM_PM=1,
  HOUR=0,
  HOUR_OF_DAY=12,
  MINUTE=20,
  SECOND=15,
  MILLISECOND=293,
  ZONE_OFFSET=0,
  DST_OFFSET=0
]

How can I format it using SimpleDateFormat?
I tried the example given here:
https://howtodoinjava.com/apache-commons/how-to-override-tostring-effectively-with-tostringbuilder/ 

public class CustomToStringStyle extends ToStringStyle
{
    private static final long serialVersionUID = 1L;
    protected void appendDetail(StringBuffer buffer, String fieldName, Object value)
    {
         if (value instanceof Date)
         {
             value = new SimpleDateFormat("yyyy-MM-dd").format(value);
         }
         buffer.append(value);
     }
}

But in this case, I don’t use JSON style of formatting. I can’t extend JsonToStringStyle because it’s private.

Tags:

2

Answers


  1. 0

    ZonedDateTime is part of the new Java 8 API while SimpleDateFormat is the old buggy Date formatter. You need to use the new DateFormatter for Java 8 date/time classes.

    The JSON you posted however is neither a ZonedDateTime, nor a Date, it is a GregorianCalendar, so not sure whether your problem is really to do with ZonedDateTime as you are saying.

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  2. 0

    GregorianCalendar is not Date, you can convert it to Date, then use the code in your link:

    if (value instanceof calendar)
{
    Date date = new Date(value.getTimeInMillis());
    value = new SimpleDateFormat("yyyy-MM-dd").format(date);
}

    I would suggest to use java.time package to deal with date and time.

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