java计算年龄
精确到天计算年龄
public static int getAgeByCardId(String card) throws Exception { Integer len = card.length(); if (len == CHINA_ID_MIN_LENGTH) { card = conver15CardTo18(card); } String birthDate = card.substring(6, 14); SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd"); Date date = sdf.parse(birthDate); return calcAge(date); } /** * 由出生日期获得年龄 精确到天 * @param birthDay * @return * @throws Exception */ public static int calcAge(Date birthDay) throws Exception { Calendar cal = Calendar.getInstance(); if (cal.before(birthDay)) { throw new IllegalArgumentException("出生日期不能晚于当前日期"); } int yearNow = cal.get(Calendar.YEAR); int monthNow = cal.get(Calendar.MONTH); int dayOfMonthNow = cal.get(Calendar.DAY_OF_MONTH); cal.setTime(birthDay); int yearBirth = cal.get(Calendar.YEAR); int monthBirth = cal.get(Calendar.MONTH); int dayOfMonthBirth = cal.get(Calendar.DAY_OF_MONTH); int age = yearNow - yearBirth; if (monthNow <= monthBirth) { if (monthNow == monthBirth) { if (dayOfMonthNow < dayOfMonthBirth) age--; }else{ age--; } } return age; }
按年计算年龄
/** * 根据身份编号获取年龄 * * @param idCard * 身份编号 * @return 年龄 */ public static int getAgeByIdCard(String idCard) { int iAge = 0; if (idCard.length() == CHINA_ID_MIN_LENGTH) { idCard = conver15CardTo18(idCard); } String year = idCard.substring(6, 10); Calendar cal = Calendar.getInstance(); int iCurrYear = cal.get(Calendar.YEAR); iAge = iCurrYear - Integer.valueOf(year); return iAge; }
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