java.util.TimeZone#toZoneId ( )源码实例Demo

/**
 * Do addition on timestamp.
 *
 * @param ts    the timestamp.
 * @param days  days count you want to add.
 * @return datetime string.
 */
public static String dateAdd(long ts, int days, TimeZone tz) {
	ZoneId zoneId = tz.toZoneId();
	Instant instant = Instant.ofEpochMilli(ts);
	ZonedDateTime zdt = ZonedDateTime.ofInstant(instant, zoneId);
	long resultTs = zdt.plusDays(days).toInstant().toEpochMilli();
	return dateFormat(resultTs, DATE_FORMAT_STRING, tz);
}
 

/**
 * Create a RollingFileWriter as specified
 *
 * @param directory Path where the log files will be created
 * @param name Base name to use for log files
 * @param zone Time zone of timestamps on rolling file names
 * @param minuteRotation If true, rotate logs every minute, if false rotate every hour
 */
RollingFileWriter(Path directory, String name, TimeZone zone, boolean minuteRotation)
{
    if (directory == null) {
        throw new IllegalArgumentException("Directory required");
    }
    if (name == null) {
        throw new IllegalArgumentException("File base name required");
    }
    if (zone == null) {
        throw new IllegalArgumentException("Time zone required");
    }

    this.directory = directory;
    this.baseName = name;
    this.timeZone = zone.toZoneId();

    final String formatPattern = (minuteRotation ? ".yyyy-MM-dd-HH-mm" : ".yyyy-MM-dd-HH");
    this.format = DateTimeFormatter.ofPattern(formatPattern);

    if (minuteRotation) {
        rollInterval = ChronoUnit.SECONDS;
    } else {
        rollInterval = ChronoUnit.HOURS;
    }

    // Set to roll immediately on first write, to ensure file is created
    this.rollAt = Instant.now().truncatedTo(rollInterval);
}
 

@Override
public ZoneId getZoneId(ZoneId input) {
    Environment env = Environment.getCurrentEnvironment();
    if (env == null) {
        throw new IllegalStateException(getClass().getName() + " called outside of a template processing thread");
    }
    final TimeZone timeZone = env.getTimeZone();
    if (timeZone == null) {
        throw new NullPointerException("Current Environment has no TimeZone set!");
    }
    return timeZone.toZoneId();
}
 

private void setZoneInfo(TimeZone newTimeZone, ZoneId newZoneId) {
  if(newTimeZone != null) {
    newZoneId = newTimeZone.toZoneId();
  } else if(newZoneId != null) {
    newTimeZone = TimeZone.getTimeZone(newZoneId);
  } else {
    newTimeZone = getDefaultTimeZone();
    newZoneId = newTimeZone.toZoneId();
  }

  _timeZone = newTimeZone;
  _zoneId = newZoneId;
}
 

/**
 * Do addition on timestamp.
 *
 * @param ts    the timestamp.
 * @param days  days count you want to add.
 * @return datetime string.
 */
public static String dateAdd(long ts, int days, TimeZone tz) {
	ZoneId zoneId = tz.toZoneId();
	Instant instant = Instant.ofEpochMilli(ts);
	ZonedDateTime zdt = ZonedDateTime.ofInstant(instant, zoneId);
	long resultTs = zdt.plusDays(days).toInstant().toEpochMilli();
	return dateFormat(resultTs, DATE_FORMAT_STRING, tz);
}
 

public MetricsStreamCallback(List<Metric> metrics, TimeZone clickHouseTimeZone) {
    this(metrics, clickHouseTimeZone.toZoneId(), LocalDate.now());
}
 

public static Object resolveZoneId(HttpServletRequest request) {
	TimeZone timeZone = RequestContextUtils.getTimeZone(request);
	return (timeZone != null ? timeZone.toZoneId() : ZoneId.systemDefault());
}
 

public static Object resolveZoneId(HttpServletRequest request) {
	TimeZone timeZone = RequestContextUtils.getTimeZone(request);
	return (timeZone != null ? timeZone.toZoneId() : ZoneId.systemDefault());
}
 

private ZoneId getTimeZone(){
	CalendarService calendarService = CalendarServiceDataFactoryImpl.createService(gtfsDao);
	TimeZone tz = calendarService.getTimeZoneForAgencyId(gtfsDao.getAllAgencies().iterator().next().getId());
	return tz.toZoneId();
}
 

public ZoneId getClientZoneId() {
	TimeZone timeZone = getClientInfo().getProperties().getTimeZone();
	return timeZone != null ? timeZone.toZoneId() : ZoneId.systemDefault();
}
 

/**
 * NOTE:
 * (1). JDK relies on the operating system clock for time.
 * Each operating system has its own method of handling date changes such as
 * leap seconds(e.g. OS will slow down the  clock to accommodate for this).
 * (2). DST(Daylight Saving Time) is a legal issue, governments changed it
 * over time. Some days are NOT exactly 24 hours long, it could be 23/25 hours
 * long on the first or last day of daylight saving time.
 * JDK can handle DST correctly.
 * TODO:
 *       carefully written algorithm can improve the performance
 */
public static int dateDiff(long t1, long t2, TimeZone tz) {
	ZoneId zoneId = tz.toZoneId();
	LocalDate ld1 = Instant.ofEpochMilli(t1).atZone(zoneId).toLocalDate();
	LocalDate ld2 = Instant.ofEpochMilli(t2).atZone(zoneId).toLocalDate();
	return (int) ChronoUnit.DAYS.between(ld2, ld1);
}
 

/**
 * Do subtraction on date string.
 *
 * @param ts    the timestamp.
 * @param days days count you want to subtract.
 * @param tz time zone of the date time string
 * @return datetime string.
 */
public static String dateSub(long ts, int days, TimeZone tz) {
	ZoneId zoneId = tz.toZoneId();
	Instant instant = Instant.ofEpochMilli(ts);
	ZonedDateTime zdt = ZonedDateTime.ofInstant(instant, zoneId);
	long resultTs = zdt.minusDays(days).toInstant().toEpochMilli();
	return dateFormat(resultTs, DATE_FORMAT_STRING, tz);
}
 

/**
 * NOTE:
 * (1). JDK relies on the operating system clock for time.
 * Each operating system has its own method of handling date changes such as
 * leap seconds(e.g. OS will slow down the  clock to accommodate for this).
 * (2). DST(Daylight Saving Time) is a legal issue, governments changed it
 * over time. Some days are NOT exactly 24 hours long, it could be 23/25 hours
 * long on the first or last day of daylight saving time.
 * JDK can handle DST correctly.
 * TODO:
 *       carefully written algorithm can improve the performance
 */
public static int dateDiff(long t1, long t2, TimeZone tz) {
	ZoneId zoneId = tz.toZoneId();
	LocalDate ld1 = Instant.ofEpochMilli(t1).atZone(zoneId).toLocalDate();
	LocalDate ld2 = Instant.ofEpochMilli(t2).atZone(zoneId).toLocalDate();
	return (int) ChronoUnit.DAYS.between(ld2, ld1);
}
 

/**
 * Do subtraction on date string.
 *
 * @param ts    the timestamp.
 * @param days days count you want to subtract.
 * @param tz time zone of the date time string
 * @return datetime string.
 */
public static String dateSub(long ts, int days, TimeZone tz) {
	ZoneId zoneId = tz.toZoneId();
	Instant instant = Instant.ofEpochMilli(ts);
	ZonedDateTime zdt = ZonedDateTime.ofInstant(instant, zoneId);
	long resultTs = zdt.minusDays(days).toInstant().toEpochMilli();
	return dateFormat(resultTs, DATE_FORMAT_STRING, tz);
}
 

/**
 * 转换成java8 时间
 *
 * @param calendar 日历
 * @return LocalDateTime
 */
public static LocalDateTime fromCalendar(final Calendar calendar) {
	TimeZone tz = calendar.getTimeZone();
	ZoneId zid = tz == null ? ZoneId.systemDefault() : tz.toZoneId();
	return LocalDateTime.ofInstant(calendar.toInstant(), zid);
}