java获取两个时间的相隔时间，包括年、月、日、时、分、秒

public static final int YEAR_RETURN = 0;

public static final int MONTH_RETURN = 1;

public static final int DAY_RETURN = 2;

public static final int HOUR_RETURN= 3;

public static final int MINUTE_RETURN = 4;

public static final int SECOND_RETURN = 5;

public static final String YYYY = "yyyy";

public static final String YYYYMM = "yyyy-MM";

public static final String YYYYMMDD = "yyyy-MM-dd";

public static final String YYYYMMDDHH= "yyyy-MM-dd HH";

public static final String YYYYMMDDHHMM = "yyyy-MM-dd HH:mm";

public static final String YYYYMMDDHHMMSS = "yyyy-MM-dd HH:mm:ss";

public static long getBetween(String beginTime, String endTime, String formatPattern, int returnPattern) throws ParseException{
SimpleDateFormat simpleDateFormat = new SimpleDateFormat(formatPattern);
Date beginDate = simpleDateFormat.parse(beginTime);
Date endDate = simpleDateFormat.parse(endTime);

Calendar beginCalendar = Calendar.getInstance();
Calendar endCalendar = Calendar.getInstance();
beginCalendar.setTime(beginDate);
endCalendar.setTime(endDate);
switch (returnPattern) {
case YEAR_RETURN:
return GgczUtil.getByField(beginCalendar, endCalendar, Calendar.YEAR);
case MONTH_RETURN:
return GgczUtil.getByField(beginCalendar, endCalendar, Calendar.YEAR)*12 + GgczUtil.getByField(beginCalendar, endCalendar, Calendar.MONTH);
case DAY_RETURN:
return GgczUtil.getTime(beginDate, endDate)/(24*60*60*1000);
case HOUR_RETURN:
return GgczUtil.getTime(beginDate, endDate)/(60*60*1000);
case MINUTE_RETURN:
return GgczUtil.getTime(beginDate, endDate)/(60*1000);
case SECOND_RETURN:
return GgczUtil.getTime(beginDate, endDate)/1000;
default:
return 0;
}
}

private static long getByField(Calendar beginCalendar, Calendar endCalendar, int calendarField){
return endCalendar.get(calendarField) - beginCalendar.get(calendarField);
}

private static long getTime(Date beginDate, Date endDate){
return endDate.getTime() - beginDate.getTime();
}

public static void main(String[] args) {
Date start = new Date("2008/05/00");
Date end = new Date("2009/06/00");
System.out.println("###start:==" + start);
System.out.println("###end:==" + end);

getMonth(start, end);
System.out.println("###getMonth():=" + getMonth(start, end));
try {
System.out.println(GgczUtil.getBetween("2013-05-02", "2013-05-05", GgczUtil.YYYYMMDD, GgczUtil.MONTH_RETURN));
} catch (ParseException e) {
e.printStackTrace();
}

}