java.text.SimpleDateFormat#toLocalizedPattern ( )源码实例Demo

private static String getFormattedFullDate(Date date)
{
	SimpleDateFormat dateFormat = (SimpleDateFormat) SimpleDateFormat.getDateInstance(SimpleDateFormat.FULL);
	String pattern = dateFormat.toLocalizedPattern();

	pattern = pattern.replace("E", "");
	pattern = pattern.replace(",", "");
	pattern = pattern.replace("  ", " ");
	pattern = pattern.trim();
	
	dateFormat.applyLocalizedPattern(pattern);

	return dateFormat.format(date);
}
 

@Test
public void dateFormatTest() throws ParseException {
    DateFormat df = DateFormat.getDateTimeInstance(DateFormat.DEFAULT, DateFormat.SHORT, Locale.ENGLISH);
    SimpleDateFormat sf = (SimpleDateFormat) df;
    String p1 = sf.toPattern();
    String p2 = sf.toLocalizedPattern();

    Assert.assertTrue("MMM d, yyyy h:mm a".equals(p1));
    Assert.assertTrue("MMM d, yyyy h:mm a".equals(p2));

    DateFormat koreaDateFormat = DateFormat.getDateTimeInstance(DateFormat.SHORT, DateFormat.SHORT, Locale.KOREA);

    Assert.assertTrue("yy. M. d a h:mm".equals(((SimpleDateFormat)koreaDateFormat).toPattern()));

    LocalDateTime dateTime1 = LocalDateTime.parse("Thu, 5 Jun 2014 05:10:40 GMT", DateTimeFormatter.RFC_1123_DATE_TIME);

    Assert.assertTrue("2014-06-05T05:10:40".equals(dateTime1.toString()));

    LocalDate localDate = LocalDate.of(2017, 8, 7);
    DateTimeFormatter df02 = DateTimeFormatter.ISO_DATE;
    Assert.assertTrue("2017-08-07".equals(localDate.format(df02)));
}
 

static String getTextInputHint(Resources res, SimpleDateFormat format) {
  String formatHint = format.toLocalizedPattern();
  String yearChar = res.getString(R.string.mtrl_picker_text_input_year_abbr);
  String monthChar = res.getString(R.string.mtrl_picker_text_input_month_abbr);
  String dayChar = res.getString(R.string.mtrl_picker_text_input_day_abbr);

  return formatHint.replaceAll("d", dayChar).replaceAll("M", monthChar).replaceAll("y", yearChar);
}
 

private static SimpleDateFormat getDateFormat()
{
	SimpleDateFormat dateFormat = (SimpleDateFormat) SimpleDateFormat.getDateInstance(SimpleDateFormat.FULL);
	String pattern = dateFormat.toLocalizedPattern();

	pattern = pattern.replace("y", "");
	pattern = pattern.replace("E", "");
	pattern = pattern.replace(",", "");
	pattern = pattern.replace("  ", " ");
	pattern = pattern.trim();

	dateFormat.applyLocalizedPattern(pattern);

	return dateFormat;
}
 

private boolean isMonthFirst(){
    SimpleDateFormat format = (SimpleDateFormat)SimpleDateFormat.getDateInstance(SimpleDateFormat.FULL);
    String pattern = format.toLocalizedPattern();

    return pattern.indexOf("M") < pattern.indexOf("d");
}
 

private static String getShortLocaleDatePattern() {
	DateFormat df = DateFormat.getDateInstance(DateFormat.SHORT, Locale.getDefault());
	SimpleDateFormat sf = (SimpleDateFormat) df;
	System.out.println("*********** " + sf.toLocalizedPattern());
	return sf.toLocalizedPattern();
}